StructureMap

https://structuremap.github.io/
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StructureMap is a feature-rich IoC/DI container for .NET with support for interception, object...
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### Example Settings Class

Source: https://structuremap.github.io/registration/on-missing-family-policies

A sample class representing application settings.

```csharp
public class SomeSettings
{
    public string ThisDirectory { get; set; }
    public string ThatDirectory { get; set; }
}
```

--------------------------------

### Try Get Instance by Type and Name

Source: https://structuremap.github.io/resolving/try-geting-an-optional-service-by-plugin-type-and-name

This example demonstrates how to use `IContainer.TryGetInstance(Type pluginType, string name)` to retrieve an instance of a service by its `Type` and a specific name. This is useful when the generic type is not known at compile time.

```APIDOC
## Try Get Instance by Type and Name

### Description
Retrieves an optional service instance using its `Type` and a specific name. Returns null if no service matches the criteria.

### Method
`IContainer.TryGetInstance(Type pluginType, string name)`

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```csharp
Type ruleType = typeof(Rule);
var instance = _container.TryGetInstance(ruleType, "Orange");
```

### Response
#### Success Response (Instance Found)
- **instance** (object) - The retrieved service instance.

#### Success Response (Instance Not Found)
- **instance** (null) - Returns null if no service with the specified type and name is registered.

#### Response Example
```csharp
// When found
instance.ShouldBeOfType(typeof(ColorRule));

// When not found
var notFoundInstance = _container.TryGetInstance(typeof(Rule), "NonExistentService");
notFoundInstance.ShouldBeNull();
```
```

--------------------------------

### Install StructureMap via NuGet

Source: https://structuremap.github.io/get-structuremap

Use this command in the Package Manager Console to install the main StructureMap package.

```powershell
PM> Install-Package StructureMap
```

--------------------------------

### Constructor and Setter Injection Example

Source: https://structuremap.github.io/software-design-concepts

Demonstrates Dependency Injection using constructor injection and setter injection. Ensure the dependent interfaces and classes are properly configured for resolution.

```csharp
public interface IDatabase { }

public class DatabaseUser
{
    // Using Constructor Injection
    public DatabaseUser(IDatabase database)
    {
    }
}

public class OtherDatabaseUser
{
    // Setter Injection
    public IDatabase Database { get; set; }
}
```

--------------------------------

### Configure Container for WhatDoIHave() Example

Source: https://structuremap.github.io/diagnostics/whatdoihave

This snippet demonstrates configuring a StructureMap container with various registrations, which can then be reported on using WhatDoIHave().

```csharp
var container = new Container(x =>
{
    x.For<IEngine>().Use<Hemi>().Named("The Hemi");

    x.For<IEngine>().Add<VEight>().Singleton().Named("V8");
    x.For<IEngine>().Add<FourFiftyFour>().AlwaysUnique();
    x.For<IEngine>().Add<StraightSix>().LifecycleIs<ThreadLocalStorageLifecycle>();

    x.For<IEngine>().Add(() => new Rotary()).Named("Rotary");
    x.For<IEngine>().Add(c => c.GetInstance<PluginElectric>());

    x.For<IEngine>().Add(new InlineFour());

    x.For<IEngine>().UseIfNone<VTwelve>();
    x.For<IEngine>().MissingNamedInstanceIs.ConstructedBy(c => new NamedEngine(c.RequestedName));
});

```

--------------------------------

### Get Default Build Plan for an Instance

Source: https://structuremap.github.io/diagnostics/build-plans

Retrieve the textual build plan for the default instance of a plugin type. This helps visualize the construction process.

```csharp
var container = Container.For<VisualizationRegistry>();

var description = container.Model.For<IDevice>().Default
    .DescribeBuildPlan();

Debug.WriteLine(description);

```

--------------------------------

### Include Registries in Container Setup

Source: https://structuremap.github.io/registration/registry-dsl

Direct a `Container` to use configurations from other `Registry` classes by calling `IncludeRegistry()`.

```csharp
[Fact]
public void include_a_registry()
{
    var registry = new Registry();
    registry.IncludeRegistry<YellowBlueRegistry>();
    registry.IncludeRegistry<RedGreenRegistry>();
    registry.IncludeRegistry<PurpleRegistry>();
    // build a container
    var container = new Container(registry);
    // verify the default implementation and total registered implementations
    container.GetInstance<IWidget>().ShouldBeOfType<AWidget>();
    container.GetAllInstances<IWidget>().Count().ShouldBe(5);
}
```

--------------------------------

### Try Get Instance by Generic Type and Name

Source: https://structuremap.github.io/resolving/try-geting-an-optional-service-by-plugin-type-and-name

This example shows how to use `IContainer.TryGetInstance<T>(name)` to retrieve an instance of a service by its generic type and a specific name. It asserts that an instance is returned when a service matching the criteria exists.

```APIDOC
## Try Get Instance by Generic Type and Name

### Description
Retrieves an optional service instance using its generic type and a specific name. Returns null if no service matches the criteria.

### Method
`IContainer.TryGetInstance<T>(string name)`

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```csharp
var instance = _container.TryGetInstance<Rule>("Orange");
```

### Response
#### Success Response (Instance Found)
- **instance** (Rule) - The retrieved service instance.

#### Success Response (Instance Not Found)
- **instance** (null) - Returns null if no service with the specified type and name is registered.

#### Response Example
```csharp
// When found
instance.ShouldBeOfType(typeof(ColorRule));

// When not found
var notFoundInstance = _container.TryGetInstance<Rule>("NonExistentService");
notFoundInstance.ShouldBeNull();
```
```

--------------------------------

### Service Locator Example with StructureMap

Source: https://structuremap.github.io/software-design-concepts

Illustrates the Service Locator pattern where a container is used to resolve dependencies on demand. Favor Dependency Injection when possible, but Service Locator can be useful for advanced scenarios.

```csharp
public class ThirdDatabaseUser
{
    private IDatabase _database;

    public ThirdDatabaseUser(IContainer container)
    {
        // This is service location
        _database = container.GetInstance<IDatabase>();
    }
}
```

--------------------------------

### Define Classes for Widget and Service

Source: https://structuremap.github.io/resolving/passing-arguments-at-runtime

Defines sample classes `ColorWidget` and `GuyWithWidgetAndService` that will be used in subsequent examples. `ColorWidget` has a constructor that accepts a string color, and `GuyWithWidgetAndService` depends on `IWidget` and `IService`.

```csharp
public class ColorWidget : IWidget
{
    public string Color { get; set; }

    public ColorWidget(string color)
    {
        Color = color;
    }
}

public class GuyWithWidgetAndService
{
    public IWidget Widget { get; set; }
    public IService Service { get; set; }

    public GuyWithWidgetAndService(IWidget widget, IService service)
    {
        Widget = widget;
        Service = service;
    }
}
```

--------------------------------

### StructureMap Configuration Exception Example

Source: https://structuremap.github.io/diagnostics/validating-container-configuration

This is an example of the exception StructureMap throws when it encounters errors during configuration validation. It summarizes all problems, including build errors and validation errors.

```text
	StructureMap.StructureMapConfigurationException
	StructureMap Failures:  1 Build/Configuration Failures and 0 Validation Errors
	
	Profile 'DEFAULT'
	
	-----------------------------------------------------------------------------------------------------
	Build Error on Instance 'StructureMap.Testing.Diagnostics.NamedWidget'
	    for PluginType StructureMap.Testing.Diagnostics.IWidget
	
	Unable to create a build plan for concrete type StructureMap.Testing.Diagnostics.NamedWidget
	new NamedWidget(String name)
	  ┗ String name = Required primitive dependency is not explicitly defined

	
```

--------------------------------

### Define Legacy Classes with Constructor Arguments

Source: https://structuremap.github.io/registration/policies

Example classes that require a 'connectionString' constructor argument. These demonstrate a scenario where a policy can automate dependency injection for common arguments.

```csharp
public class DatabaseUser
{
    public string ConnectionString { get; set; }

    public DatabaseUser(string connectionString)
    {
        ConnectionString = connectionString;
    }
}

public class ConnectedThing
{
    public string ConnectionString { get; set; }

    public ConnectedThing(string connectionString)
    {
        ConnectionString = connectionString;
    }
}
```

--------------------------------

### Install Strong-Named StructureMap via NuGet

Source: https://structuremap.github.io/get-structuremap

Use this command if you require a strong-named version of the StructureMap assembly.

```powershell
PM> Install-Package structuremap-signed
```

--------------------------------

### Get Build Plan for a Named Instance

Source: https://structuremap.github.io/diagnostics/build-plans

Retrieve the build plan for a specific named instance of a plugin type. Use this when you have multiple configurations for the same type.

```csharp
var description = theContainer.Model.For<IDevice>()
    .Find("A")
    .DescribeBuildPlan();


```

--------------------------------

### Get Instance by PluginType

Source: https://structuremap.github.io/resolving/get-a-service-by-plugintype

Demonstrates how to retrieve the default configured object of a plugin type using the IContainer.GetInstance() method. This can be done using either the generic type or the typeof operator.

```APIDOC
## Get Instance by PluginType

### Description
Requesting the default configured object of a plugin type is done through the `IContainer.GetInstance()` method.

### Method
`IContainer.GetInstance<T>()` or `IContainer.GetInstance(Type type)`

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```csharp
[Fact]
public void get_the_default_instance()
{
    var container = new Container(x => { x.For<IWidget>().Use<AWidget>(); });

    // Using generic type
    container.GetInstance<IWidget>()
        .ShouldBeOfType<AWidget>();

    // Using typeof operator
    container.GetInstance(typeof(IWidget))
        .ShouldBeOfType<AWidget>();
}
```

### Response
#### Success Response (200)
An instance of the requested plugin type.

#### Response Example
(Implicitly demonstrated in the Request Example where the returned object is asserted to be of type AWidget)
```

--------------------------------

### StructureMap Exception for Missing Default Instance (Pre-3.0)

Source: https://structuremap.github.io/glossary

This is an example of a StructureMap exception message from versions prior to 3.0, indicating that no default instance was defined for a given plugin type.

```text
StructureMap Exception Code:  202
No Default Instance defined for PluginFamily [plugin type]
```

--------------------------------

### Try Get Instance by Name and Generic Type

Source: https://structuremap.github.io/resolving/try-geting-an-optional-service-by-plugin-type-and-name

Use `TryGetInstance<T>(name)` to retrieve an instance by its generic type and name. This method returns an instance if found, otherwise null. Ensure the service is registered before attempting to retrieve it.

```csharp
[Fact]
public void TryGetInstanceViaNameAndGeneric_ReturnsInstance_WhenTypeFound()
{
    addColorInstance("Red");
    addColorInstance("Orange");
    addColorInstance("Blue");

    // "Orange" exists, so an object should be returned
    var instance = _container.TryGetInstance<Rule>("Orange");
    instance.ShouldBeOfType(typeof(ColorRule));
}
```

--------------------------------

### Demonstrating Auto-Wiring with Build Plan

Source: https://structuremap.github.io/the-container/auto-wiring

This snippet shows how to configure a StructureMap container and then inspect the build plan for a class, demonstrating how auto-wiring resolves dependencies through its public constructor.

```csharp
public void ShowBuildPlan()
{
    var container = new Container(_ =>
    {
        _.For<IShippingService>().Use<InternalShippingService>();
        _.For<IRepository>().Use<SimpleRepository>();
    });

    // Just proving that we can build ShippingScreenPresenter;)
    container.GetInstance<ShippingScreenPresenter>().ShouldNotBeNull();

    var buildPlan = container.Model.For<ShippingScreenPresenter>().Default.DescribeBuildPlan(1);

    Debug.WriteLine(buildPlan);
}
```

--------------------------------

### Configure StructureMap Container with Registry

Source: https://structuremap.github.io/registration

Demonstrates three methods for initializing a StructureMap container using a Registry class: passing an instance, adding the registry via configuration, or using a static factory method.

```csharp
// Example #1
            var container1 = new Container(new FooBarRegistry());

// Example #2
            var container2 = new Container(c => { c.AddRegistry<FooBarRegistry>(); });

// Example #3 -- create a container for a single Registry
            var container3 = Container.For<FooBarRegistry>();
```

--------------------------------

### Supply Named Constructor Arguments

Source: https://structuremap.github.io/resolving/passing-arguments-at-runtime

Demonstrates how to supply primitive arguments to constructors at runtime. The first part shows initial configuration, and the second part uses `container.With()` to override the 'color' argument for `IWidget`.

```csharp
[Fact]
public void supply_named_arguments()
{
    var container = new Container(x => { x.For<IWidget>().Use<ColorWidget>().Ctor<string>().Is("Red"); });

    container.GetInstance<IWidget>()
        .ShouldBeOfType<ColorWidget>()
        .Color.ShouldBe("Red");

    container.With("color").EqualTo("Blue")
        .GetInstance<IWidget>()
        .ShouldBeOfType<ColorWidget>()
        .Color.ShouldBe("Blue");
}
```

--------------------------------

### Get Default Instance of a Service

Source: https://structuremap.github.io/resolving/get-a-service-by-plugintype

Use IContainer.GetInstance<T>() for generic type retrieval or IContainer.GetInstance(Type) for non-generic retrieval to get the default configured object for a plugin type.

```csharp
[Fact]
public void get_the_default_instance()
{
    var container = new Container(x => { x.For<IWidget>().Use<AWidget>(); });

    container.GetInstance<IWidget>()
        .ShouldBeOfType<AWidget>();

    // or

    container.GetInstance(typeof(IWidget))
        .ShouldBeOfType<AWidget>();
}
```

--------------------------------

### Define Services for StructureMap

Source: https://structuremap.github.io/registration

Defines interfaces and concrete classes used in StructureMap configuration examples.

```csharp
public interface IBar
{
}

public class Bar : IBar
{
}

public interface IFoo
{
}

public class Foo : IFoo
{
    public IBar Bar { get; private set; }

    public Foo(IBar bar)
    {
        Bar = bar;
    }
}
```

--------------------------------

### Registering and Using a Custom Constructor Selector

Source: https://structuremap.github.io/registration/constructor-selection

Demonstrates how to register a custom constructor selector policy and verifies its behavior by resolving instances of Thing1 and Thing2.

```csharp
[Fact]
public void use_a_custom_constructor_selector()
{
    var container = new Container (_ =>
    {
        _.For<IWidget>().Use<AWidget>();

        _.Policies.ConstructorSelector<ThingCtorRule>();
    });

    container.GetInstance<Thing1>()
        .CorrectCtorWasUsed.ShouldBeTrue();

    container.GetInstance<Thing2>()
        .CorrectCtorWasUsed.ShouldBeTrue();
}
```

--------------------------------

### StructureMap Decorator Registration Example

Source: https://structuremap.github.io/interception-and-decorators

Configures StructureMap to decorate all IWidget registrations with WidgetHolder and sets AWidget as the default implementation.

```csharp
[Fact]
public void decorator_example()
{
    var container = new Container(_ =>
    {
        // This usage adds the WidgetHolder as a decorator
        // on all IWidget registrations and makes AWidget
        // the default
        _.For<IWidget>().DecorateAllWith<WidgetHolder>();
        _.For<IWidget>().Use<AWidget>();
    });

    container.GetInstance<IWidget>()
        .ShouldBeOfType<WidgetHolder>()
        .Inner.ShouldBeOfType<AWidget>();
}
```

--------------------------------

### Configure Lifecycles and Test Precedence

Source: https://structuremap.github.io/object-lifecycle/configuring-lifecycles

Demonstrates configuring default lifecycles for plugin types and specific instances, then verifies the precedence rules.

```csharp
[Fact]
public void lifecycle_precedence()
{
    var container = new Container(x =>
    {
        x.For<IWidget>().Use<AWidget>();

        // Configure the default lifecycle for
        // a PluginType (Rule)
        x.For<Rule>().Singleton();
        x.For<Rule>().Add<ARule>().Named("C");

        // Configure the lifecycle for a single Instance
        x.For<Rule>().Add<ARule>().Named("A").Transient();
        x.For<Rule>().Add<ARule>().Named("B").AlwaysUnique();
    });

    // The default lifecycle is Transient
    container.Model.For<IWidget>().Default
        .Lifecycle.ShouldBeOfType<TransientLifecycle>();

    // Override at the Family
    container.Model.For<Rule>().Lifecycle.ShouldBeOfType<SingletonLifecycle>();
    container.Model.For<Rule>().Find("C").Lifecycle.ShouldBeOfType<SingletonLifecycle>();

    // 'C' is the default lifecycle for Rule (SingletonThing)
    container.GetInstance<Rule>("C")
        .ShouldBeTheSameAs(container.GetInstance<Rule>("C"));

    // 'A' is a transient
    container.GetInstance<Rule>("A")
        .ShouldNotBeTheSameAs(container.GetInstance<Rule>("A"));

    using (var nested = container.GetNestedContainer())
    {
        // 'B' is always unique
        nested.GetInstance<Rule>("B")
            .ShouldNotBeTheSameAs(nested.GetInstance<Rule>("B"));
    }
}

```

--------------------------------

### Generate Basic Container Report

Source: https://structuremap.github.io/diagnostics/whatdoihave

Use this to get a general textual report of the current configuration of a running StructureMap container.

```csharp
var container = new Container();
var report = container.WhatDoIHave();

Debug.WriteLine(report);

```

--------------------------------

### Define Default Services with UseIfNone()

Source: https://structuremap.github.io/registration/fallback-services

Use `UseIfNone()` to register a default implementation for a service. This implementation will only be used if no other concrete registration for the service is found.

```csharp
public class DefaultServices : Registry
{
    public DefaultServices()
    {
        // If nobody else provides a default
        // for IWidget, use AWidget
        For<IWidget>().UseIfNone<AWidget>();
    }
}
```

```csharp
public class SpecificServices : Registry
{
    public SpecificServices()
    {
        // Use BWidget for IWidget, period
        For<IWidget>().Use<BWidget>();
    }
}
```

--------------------------------

### Define Rule Interface and Implementation

Source: https://structuremap.github.io/the-container/handling-missing-named-instances

Defines a simple 'Rule' interface and a 'ColorRule' implementation used in examples for missing named instances.

```csharp
public interface Rule
{
}

public class ColorRule : Rule
{
    public string Color { get; set; }

    public ColorRule(string color)
    {
        Color = color;
    }
}
```

--------------------------------

### Demonstrate Child Container in Action

Source: https://structuremap.github.io/the-container/profiles-and-child-containers

Shows how to create a child container that overrides specific registrations while falling back to the parent for others. Useful for isolating configuration changes for specific parts of an application.

```csharp
[
    Fact
]
public void show_a_child_container_in_action()
{
    var parent = new Container(_ =>
    {
        _.For<IWidget>().Use<AWidget>();
        _.For<IService>().Use<AService>();
    });

    // Create a child container and override the
    // IService registration
    var child = parent.CreateChildContainer();
    child.Configure(_ =>
    {
        _.For<IService>().Use<ChildSpecialService>();
    });

    // The child container has a specific registration
    // for IService, so use that one
    child.GetInstance<IService>()
        .ShouldBeOfType<ChildSpecialService>();

    // The child container does not have any
    // override of IWidget, so it uses its parent's
    // configuration to resolve IWidget
    child.GetInstance<IWidget>()
        .ShouldBeOfType<AWidget>();
}



```

--------------------------------

### Custom AllInterfacesConvention Implementation

Source: https://structuremap.github.io/registration/auto-registration-and-conventions

An example implementation of `IRegistrationConvention` that registers a concrete type against all interfaces it implements. It filters for concrete, closed types.

```csharp
public interface IFoo
{
}

public interface IBar
{
}

public interface IBaz
{
}

public class BusyGuy : IFoo, IBar, IBaz
{
}

// Custom IRegistrationConvention
public class AllInterfacesConvention : IRegistrationConvention
{
    public void ScanTypes(TypeSet types, Registry registry)
    {
        // Only work on concrete types
        types.FindTypes(TypeClassification.Concretes | TypeClassification.Closed).Each(type =>
        {
            // Register against all the interfaces implemented
            // by this concrete class
            type.GetInterfaces().Each(@interface => registry.For(@interface).Use(type));
        });
    }
}
```

--------------------------------

### Configure a Profile with Default Instance

Source: https://structuremap.github.io/the-container/profiles-and-child-containers

Demonstrates how to define a named profile with specific service registrations. Profiles are useful for establishing different service resolutions for different application modes or user types.

```csharp
[
    Fact
]
public void Add_default_instance_with_concrete_type()
{
    IContainer container = new Container(registry =>
    {
        registry.Profile("something", p =>
        {
            p.For<IWidget>().Use<AWidget>();
            p.For<Rule>().Use<DefaultRule>();
        });
    });

    var profile = container.GetProfile("something");

    profile.GetInstance<IWidget>().ShouldBeOfType<AWidget>();
    profile.GetInstance<Rule>().ShouldBeOfType<DefaultRule>();
}



```

--------------------------------

### Custom Interception Policy Example

Source: https://structuremap.github.io/interception-and-decorators

This custom policy decorates all IWidget instances with WidgetHolder. Ensure DecoratorInterceptor is available and configured correctly.

```csharp
public class CustomInterception : IInterceptorPolicy
{
    public string Description
    {
        get { return "good interception policy"; }
    }

    public IEnumerable<IInterceptor> DetermineInterceptors(Type pluginType, Instance instance)
    {
        if (pluginType == typeof(IWidget))
        {
            yield return new DecoratorInterceptor(typeof(IWidget), typeof(WidgetHolder));
        }
    }
}
```

--------------------------------

### LoggerConvention for Construction Policies

Source: https://structuremap.github.io/the-container/working-with-the-icontext-at-build-time

An example of a custom Construction Policy that injects a Logger based on the type being constructed. This is an alternative to using IContext directly at runtime.

```csharp
public class LoggerConvention : ConfiguredInstancePolicy
{
    protected override void apply(Type pluginType, IConfiguredInstance instance)
    {
        instance.Constructor
            .GetParameters()
            .Where(param => param.ParameterType == typeof(Logger))
            .Each(param => instance.Dependencies.Add(LoggerFactory.LoggerFor(instance.PluggedType)));
    }
}
```

--------------------------------

### Registering Services with Constructor Arguments

Source: https://structuremap.github.io/registration

Configure a container to register a service and provide a primitive constructor argument. This is useful for types like SqlConnection that require configuration values.

```csharp
var container = new Container(c =>
{
    //just for demo purposes, normally you don't want to embed the connection string directly into code.
    c.For<IDbConnection>().Use<SqlConnection>().Ctor<string>().Is("YOUR_CONNECTION_STRING");
    //a better way would be providing a delegate that retrieves the value from your app config.    
});
```

--------------------------------

### Inline Constructor Arguments Registration

Source: https://structuremap.github.io/registration/inline-dependencies

Demonstrates various methods for registering inline constructor arguments for SimpleRule dependencies.

```csharp
public class InlineCtorArgs : Registry
{
    public InlineCtorArgs()
    {
        // Defining args by type
        For<IEventRule>().Use<SimpleRule>()
            .Ctor<ICondition>().Is<Condition1>()
            .Ctor<IAction>().Is<Action1>()
            .Named("One");

        // Pass the explicit values for dependencies
        For<IEventRule>().Use<SimpleRule>()
            .Ctor<ICondition>().Is(new Condition2())
            .Ctor<IAction>().Is(new Action2())
            .Named("Two");

        // Use Lambda construction
        For<IEventRule>().Use<SimpleRule>()
            .Ctor<ICondition>().Is(() => new Condition3())
            .Ctor<IAction>().Is("some crazy builder", c => c.GetInstance<Action3>())
            .Named("Three");

        // Rarely used, but gives you a "do any crazy thing" option
        // Pass in your own Instance object
        For<IEventRule>().Use<SimpleRule>()
            .Ctor<IAction>().Is(new MySpecialActionInstance());

        // Inline configuration of your dependency's dependencies

        For<IEventRule>().Use<SimpleRule>()
            .Ctor<ICondition>().IsSpecial(_ => _.Type<BigCondition>().Ctor<int>().Is(100))

            // or
            .Ctor<ICondition>().Is(new SmartInstance<BigCondition>().Ctor<int>().Is(100));
    }

    public class BigCondition : ICondition
    {
        public BigCondition(int number)
        {
        }

        public bool Matches(SomeEvent @event)
        {
            throw new NotImplementedException();
        }
    }

    public class MySpecialActionInstance : LambdaInstance<Action3>
    {
        public MySpecialActionInstance()
            : base(() => new Action3())
        {
        }
    }
}

```

--------------------------------

### Reflecting over Constructor Parameters

Source: https://structuremap.github.io/registration/configured-instance

Shows how to inspect the constructor parameters of an IConfiguredInstance using .Net Reflection.

```csharp
public class GuyWithArguments
{
    public GuyWithArguments(IWidget widget, Rule rule)
    {
    }
}

[Fact]
public void reflecting_over_constructor_args()
{
    IConfiguredInstance instance = new SmartInstance<GuyWithArguments>()
        // I'm just forcing it to assign the constructor function
        .SelectConstructor(() => new GuyWithArguments(null, null));

    instance.Constructor.GetParameters().Select(x => x.Name)
        .ShouldHaveTheSameElementsAs("widget", "rule");
}
```

--------------------------------

### Nested Containers from Profiles

Source: https://structuremap.github.io/the-container/nested-containers

Illustrates creating nested containers from profile configurations. This allows for distinct configurations to be applied to nested scopes.

```csharp
[Fact]
public void nested_container_from_profile_container()
{
    var container = new Container(x =>
    {
        x.For<IColor>().Use<Red>();

        x.Profile("Blue", _ => _.For<IColor>().Use<Blue>());
        x.Profile("Green", _ => _.For<IColor>().Use<Green>());
    });

    using (var nested = container.GetProfile("Blue").GetNestedContainer())
    {
        nested.GetInstance<IColor>().ShouldBeOfType<Blue>();
    }

    using (var nested = container.GetNestedContainer("Green"))
    {
        nested.GetInstance<IColor>().ShouldBeOfType<Green>();
    }
}
```

--------------------------------

### Define Services Consuming IDatabase

Source: https://structuremap.github.io/registration/policies

Defines example service classes (BigService, ImportantService, DoubleDatabaseUser) that depend on IDatabase, specifying which named database they require via constructor parameters.

```csharp
public class BigService
{
    public BigService(IDatabase green)
    {
        DB = green;
    }

    public IDatabase DB { get; set; }
}

public class ImportantService
{
    public ImportantService(IDatabase red)
    {
        DB = red;
    }

    public IDatabase DB { get; set; }
}

public class DoubleDatabaseUser
{
    public DoubleDatabaseUser(IDatabase red, IDatabase green)
    {
        Red = red;
        Green = green;
    }

    // Watch out for potential conflicts between setters
    // and ctor params. The easiest thing is to just make
    // setters private
    public IDatabase Green { get; private set; }

    public IDatabase Red { get; private set; }
}
```

--------------------------------

### Func<T> for Lazy Singleton Resolution

Source: https://structuremap.github.io/the-container/lazy-resolution

Inject `Func<T>` to lazily resolve a dependency. This example demonstrates resolving a singleton widget, ensuring multiple calls to the function return the same instance.

```csharp
[Fact]
public void build_a_func_that_returns_a_singleton()
{
    var container = new Container(x =>
    {
        x.ForSingletonOf<IWidget>().Use<ColorWidget>().Ctor<string>("color").Is("green");
    });

    var func = container.GetInstance<Func<IWidget>>();
    var w1 = func();
    var w2 = func();
    var w3 = func();

    w1.ShouldBeOfType<ColorWidget>().Color.ShouldBe("green");

    w1.ShouldBeTheSameAs(w2);
    w1.ShouldBeTheSameAs(w3);
    w2.ShouldBeTheSameAs(w3);
}
```

--------------------------------

### Implement DummyService

Source: https://structuremap.github.io/autofactory

Provides a concrete implementation of the IDummyService interface.

```csharp
public class DummyService : IDummyService
{
    public string Name { get; set; }
}
```

--------------------------------

### Registering Logger with IContext and ParentType

Source: https://structuremap.github.io/the-container/working-with-the-icontext-at-build-time

Demonstrates registering a Logger dependency using IContext.ParentType to inject a logger specific to the type being created. AlwaysUnique() ensures each instance gets its own logger.

```csharp
[Fact]
public void can_happily_use_the_parent_type()
{
    var container = new Container(x =>
    {
        // AlwaysUnique() is important so that every object created will get
        // their own Logger instead of sharing whichever one is created first
        x.For<Logger>().Use(c => LoggerFactory.LoggerFor(c.ParentType)).AlwaysUnique();
    });

    var top = container.GetInstance<LoggedClass1>();
    top.Logger.ParentType.ShouldBe(typeof(LoggedClass1));
    top.Child.Logger.ParentType.ShouldBe(typeof(LoggedClass2));
    top.Child.Child.Logger.ParentType.ShouldBe(typeof(LoggedClass3));
}
```

--------------------------------

### Use ILogVisualizer with StructureMap

Source: https://structuremap.github.io/generics

Demonstrates how to obtain an ILogVisualizer instance from a StructureMap container and use it to convert a specific log object to HTML.

```csharp
// Just setting up a Container and ILogVisualizer
var container = Container.For<VisualizationRegistry>();
var visualizer = container.GetInstance<ILogVisualizer>();

// If I have an IssueCreated lob object...
var created = new IssueCreated();

// I can get the html representation:
var html = visualizer.ToHtml(created);

```

--------------------------------

### Pass Arguments with Fluent Interface

Source: https://structuremap.github.io/resolving/passing-arguments-at-runtime

Uses the `IContainer.With()` fluent interface to pass specific instances of `IWidget` and `IService` when getting an instance of `GuyWithWidgetAndService`. This overrides the default registrations for these interfaces.

```csharp
var widget = new BWidget();
var service = new BService();

var guyWithWidgetAndService = container
    .With<IWidget>(widget)
    .With<IService>(service)
    .GetInstance<GuyWithWidgetAndService>();

guyWithWidgetAndService
    .Widget.ShouldBeTheSameAs(widget);

guyWithWidgetAndService
    .Service.ShouldBeTheSameAs(service);
```

--------------------------------

### Include Default and Scan for Specific Registrations

Source: https://structuremap.github.io/registration/fallback-services

Include default registries using `IncludeRegistry()` and scan for other registries in assemblies. Registrations found during the scan will take precedence over `UseIfNone()` registrations.

```csharp
[AttributeUsage(AttributeTargets.Assembly)]
public class ProductModuleAttribute : Attribute
{
}

public class ApplicationRegistry : Registry
{
    public ApplicationRegistry()
    {
        // Use the default services as fallbacks
        IncludeRegistry<DefaultServices>();

        // Dependending on what assemblies are present,
        // this might find specific registrations that
        // will take precedence over the UseIfNone()
        // registrations in DefaultServices
        Scan(_ =>
        {
            _.AssembliesFromApplicationBaseDirectory(
                assem => assem.HasAttribute<ProductModuleAttribute>());

            _.LookForRegistries();
        });
    }
}
```

--------------------------------

### Exercise Named Database Injection Policy

Source: https://structuremap.github.io/registration/policies

Demonstrates retrieving instances of the services and verifies that the correct named IDatabase implementations ('red' or 'green') have been injected based on the constructor parameter names.

```csharp
// ImportantService should get the "red" database
container.GetInstance<ImportantService>()
    .DB.As<Database>().ConnectionString.ShouldBe("*red*");

// BigService should get the "green" database
container.GetInstance<BigService>()
    .DB.As<Database>().ConnectionString.ShouldBe("*green*");

// DoubleDatabaseUser gets both
var user = container.GetInstance<DoubleDatabaseUser>();

user.Green.As<Database>().ConnectionString.ShouldBe("*green*");
user.Red.As<Database>().ConnectionString.ShouldBe("*red*");
```

--------------------------------

### Creating and Using a Nested Container

Source: https://structuremap.github.io/the-container/nested-containers

Demonstrates how to create a nested container from an existing IContainer and resolve services within its scope. Objects resolved from the nested container are disposed when the nested container is disposed.

```csharp
public interface IWorker
{
    void DoWork();
}

public class Worker : IWorker, IDisposable
{
    public void DoWork()
    {
        // do stuff!
    }

    public void Dispose()
    {
        // clean up
    }
}

[Fact]
public void creating_a_nested_container()
{
    // From an IContainer object
    var container = new Container(_ => { _.For<IWorker>().Use<Worker>(); });

    using (var nested = container.GetNestedContainer())
    {
        // This object is disposed when the nested container
        // is disposed
        var worker = nested.GetInstance<IWorker>();
        worker.DoWork();
    }
```

--------------------------------

### Inspect Type Scanning with WhatDidIScan

Source: https://structuremap.github.io/diagnostics/type-scanning

Call `Container.WhatDidIScan()` to get a textual report of all type scanning operations performed by the container. This helps in understanding which assemblies were scanned and which conventions were applied.

```csharp
var container = new Container(_ =>
{
    _.Scan(x =>
    {
        x.TheCallingAssembly();

        x.WithDefaultConventions();
        x.RegisterConcreteTypesAgainstTheFirstInterface();
        x.SingleImplementationsOfInterface();
    });

    _.Scan(x =>
    {
        // Give your scanning operation a descriptive name
        // to help the diagnostics to be more useful
        x.Description = "Second Scanner";

        x.AssembliesFromApplicationBaseDirectory(assem => assem.FullName.Contains("Widget"));
        x.ConnectImplementationsToTypesClosing(typeof(IService<>));
        x.AddAllTypesOf<IWidget>();
    });
});

Debug.WriteLine(container.WhatDidIScan());
```

```text
/*
All Scanners
================================================================
Scanner #1
Assemblies
----------
* StructureMap.Testing, Version=4.0.0.51243, Culture=neutral, PublicKeyToken=null

Conventions
--------
* Default I[Name]/[Name] registration convention
* Register all concrete types against the first interface (if any) that they implement
* Register any single implementation of any interface against that interface

Second Scanner
Assemblies
----------
* StructureMap.Testing.GenericWidgets, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
* StructureMap.Testing.Widget, Version=4.0.0.51243, Culture=neutral, PublicKeyToken=null
* StructureMap.Testing.Widget2, Version=4.0.0.51243, Culture=neutral, PublicKeyToken=null
* StructureMap.Testing.Widget3, Version=4.0.0.51243, Culture=neutral, PublicKeyToken=null
* StructureMap.Testing.Widget4, Version=4.0.0.51243, Culture=neutral, PublicKeyToken=null
* StructureMap.Testing.Widget5, Version=4.0.0.51243, Culture=neutral, PublicKeyToken=null

Conventions
--------
* Connect all implementations of open generic type IService<T>
* Find and register all types implementing StructureMap.Testing.Widget.IWidget

*/
```

--------------------------------

### Configure StructureMap Container Directly

Source: https://structuremap.github.io/registration

Shows two ways to create and configure a StructureMap container: passing configuration directly to the constructor or configuring it after creation.

```csharp
// Example #1 - Create an container instance and directly pass in the configuration.
            var container1 = new Container(c =>
            {
                c.For<IFoo>().Use<Foo>();
                c.For<IBar>().Use<Bar>();
            });

// Example #2 - Create an container instance but add configuration later.
            var container2 = new Container();

            container2.Configure(c =>
            {
                c.For<IFoo>().Use<Foo>();
                c.For<IBar>().Use<Bar>();
            });
```

--------------------------------

### Implement Custom FuncInstance with LambdaInstance

Source: https://structuremap.github.io/instances

Subclass LambdaInstance to create a custom Instance type for Func<T>. This example shows how to pass a Func<IContext, T> to the base constructor and override the Description property.

```csharp
public class FuncInstance<T> : LambdaInstance<Func<T>>
{
    // Pass a Func<IContext, T> into the base constructor
    // Use a static method for cleaner syntax to avoid the 
    // nasty Lambda syntax formatting as needed
    public FuncInstance() : base(s => s.GetInstance<IContainer>().GetInstance<T>)
    {
    }

    public override string Description
    {
        get { return "Constructor for Func<{0}>".ToFormat(typeof (T).Name); }
    }
}
```

--------------------------------

### Register and Verify Singleton Cache

Source: https://structuremap.github.io/registration/policies

Demonstrates registering a WidgetCache implementation with the CacheIsSingleton policy and verifies that it is indeed a singleton. The policy is applied when StructureMap creates a build plan.

```csharp
[Fact]
public void set_cache_to_singleton()
{
    var container = new Container(_ =>
    {
        _.Policies.Add<CacheIsSingleton>();

        _.For<IWidgets>().Use<WidgetCache>();
    });

    // The policy is applied *only* at the time
    // that StructureMap creates a "build plan"
    container.GetInstance<IWidgets>()
        .ShouldBeTheSameAs(container.GetInstance<IWidgets>());

    // Now that the policy has executed, we
    // can verify that WidgetCache is a SingletonThing
    container.Model.For<IWidgets>().Default
        .Lifecycle.ShouldBeOfType<SingletonLifecycle>();
}
```

--------------------------------

### ISettingsProvider Interface and Implementation

Source: https://structuremap.github.io/registration/on-missing-family-policies

Defines and implements an interface for retrieving settings, with a basic AppSettingsProvider.

```csharp
public interface ISettingsProvider
{
    T SettingsFor<T>() where T : class, new();

    object SettingsFor(Type settingsType);
}

public class AppSettingsProvider : ISettingsProvider
{
    public T SettingsFor<T>() where T : class, new()
    {
        return SettingsFor(typeof (T)).As<T>();
    }

    public object SettingsFor(Type settingsType)
    {
        // The real one reads key/value data from
        // the appSettings and uses FubuCore's
        // model binding to assign data to a new
        // object of settingsType
        return null;
    }
}
```

--------------------------------

### Configure and Resolve with Explicit Registration

Source: https://structuremap.github.io/quickstart

Demonstrates explicitly configuring a StructureMap Container and resolving an object instance.

```csharp
// Configure and build a brand new
// StructureMap Container object
            var container = new Container(_ =>
            {
                _.For<IFoo>().Use<Foo>();
                _.For<IBar>().Use<Bar>();
            });

// Now, resolve a new object instance of IFoo
            container.GetInstance<IFoo>()
                // should be type Foo
                .ShouldBeOfType<Foo>()

                // and the IBar dependency too
                .Bar.ShouldBeOfType<Bar>();



```

--------------------------------

### Get Named Service Instance

Source: https://structuremap.github.io/resolving/get-a-service-by-plugin-type-and-name

Demonstrates retrieving named instances of IWidget using both generic and typeof overloads of GetInstance. Ensure the service is registered with a name using .Named() during container configuration.

```csharp
[Fact]
public void get_a_named_instance()
{
    var container = new Container(x =>
    {
        x.For<IWidget>().Add<AWidget>().Named("A");
        x.For<IWidget>().Add<BWidget>().Named("B");
        x.For<IWidget>().Add<CWidget>().Named("C");
    });

    container.GetInstance<IWidget>("A").ShouldBeOfType<AWidget>();
    container.GetInstance<IWidget>("B").ShouldBeOfType<BWidget>();
    container.GetInstance<IWidget>("C").ShouldBeOfType<CWidget>();

    // or

    container.GetInstance(typeof(IWidget), "A").ShouldBeOfType<AWidget>();
    container.GetInstance(typeof(IWidget), "B").ShouldBeOfType<BWidget>();
    container.GetInstance(typeof(IWidget), "C").ShouldBeOfType<CWidget>();
}

```

--------------------------------

### AlwaysUnique Lifecycle Example

Source: https://structuremap.github.io/object-lifecycle/supported-lifecycles

Demonstrates that AlwaysUnique creates a new object instance on every request, even within nested containers or within a single request's object graph. Instances are not tracked or disposed by StructureMap.

```csharp
[Fact]
public void Always_Unique()
{
    var c = new Container(x => { x.For<IService>().Use<Service>().AlwaysUnique(); });

    // In a normal container, you get a new object
    // instance of the Service class in subsequent
    // requests
    c.GetInstance<IService>()
        .ShouldNotBeTheSameAs(c.GetInstance<IService>())
        .ShouldNotBeTheSameAs(c.GetInstance<IService>());

    // Within a nested container, 'Transient' now
    // means within the Nested Container.
    // A nested container is effectively one request
    using (var nested = c.GetNestedContainer())
    {
        nested.GetInstance<IService>()
            .ShouldNotBeTheSameAs(nested.GetInstance<IService>())
            .ShouldNotBeTheSameAs(nested.GetInstance<IService>());
    }

    // Even in a single request,
    var holder = c.GetInstance<ServiceUserHolder>();
    holder.Service.ShouldNotBeTheSameAs(holder.User.Service);
}

```

--------------------------------

### Manipulate Individual Instances

Source: https://structuremap.github.io/diagnostics/using-the-container-model

Find the model for a single instance, build or resolve an object, test if a singleton has been created, eject a singleton, test the lifecycle, describe the build plan, and access the raw instance model.

```csharp
// First, find the model for a single Instance
var instance = container.Model.For<IDevice>().Default;

// build or resolve an object for this Instance cast to
// the type specified to the Get() method
instance.Get<IDevice>().ShouldBeOfType<DefaultDevice>();

// if the instance is configured as a SingletonThing, test
// if the SingletonThing object has already been created
var hasSingletonBeenCreated = instance.ObjectHasBeenCreated();

if (hasSingletonBeenCreated)
{
    // remove the SingletonThing object from the cache so that
    // StructureMap will be forced to rebuild this object
    instance.EjectObject();
}

// test the lifecycle of this instance
instance.Lifecycle.ShouldBeOfType<SingletonLifecycle>();

// Visualize the build plan no more than 3 levels deep
Debug.WriteLine(instance.DescribeBuildPlan(3));

// Get at the underlying Instance model that StructureMap itself
// uses. Be cautious using this.
var rawModel = instance.Instance;

```

--------------------------------

### Retrieve All Instances of a Plugin Type

Source: https://structuremap.github.io/resolving/get-all-services-by-plugin-type

Use GetAllInstances<T>() to get all configured instances of a generic type. Alternatively, use GetAllInstances(typeof(T)) for non-generic retrieval, ensuring to cast the results if necessary. The order of instances returned matches the order they were configured.

```csharp
using StructureMap;
using Xunit;
using Shouldly;

public class Widget {}
public class AWidget : Widget {}
public class BWidget : Widget {}
public class CWidget : Widget {}

public class get_all_instances
{
    [Fact]
    public void get_all_instances() {
        var container = new Container(x =>
        {
            x.For<IWidget>().Add<AWidget>().Named("A");
            x.For<IWidget>().Add<BWidget>().Named("B");
            x.For<IWidget>().Add<CWidget>().Named("C");
        });

        container.GetAllInstances<IWidget>()
            .Select(x => x.GetType())
            .ShouldHaveTheSameElementsAs(typeof(AWidget), typeof(BWidget), typeof(CWidget));

        // or

        container.GetAllInstances(typeof(IWidget))
            .OfType<IWidget>() // returns an IEnumerable, so I'm casting here
            .Select(x => x.GetType())
            .ShouldHaveTheSameElementsAs(typeof(AWidget), typeof(BWidget), typeof(CWidget));
    }
}
```

--------------------------------

### Implement MathService

Source: https://structuremap.github.io/dynamic-interception

Provides a concrete implementation of the IMathService interface.

```csharp
private class MathService : IMathService
{
    public int GetSquareRoot(int value)
    {
        return (int)Math.Sqrt(value);
    }

    public async Task<int> GetSquareRootAsync(int value)
    {
        await Task.Yield();
        return (int)Math.Sqrt(value);
    }
}
```

--------------------------------

### Test UseIfNone() Behavior

Source: https://structuremap.github.io/registration/fallback-services

Verify that `UseIfNone()` correctly falls back to the default implementation when no other registrations exist, and that specific registrations override the fallback.

```csharp
[Fact]
public void see_use_if_none_in_action()
{
    var container1 = Container.For<DefaultServices>();

    // No other registrations, so fallback
    // to AWidget
    container1.GetInstance<IWidget>()
        .ShouldBeOfType<AWidget>();

    var container2 = new Container(_ =>
    {
        // add both registries above
        // NOTE: the order does not matter for IWidget

        _.IncludeRegistry<SpecificServices>();
        _.IncludeRegistry<DefaultServices>();
    });

    // The registration in SpecificServices
    // should win out
    container2.GetInstance<IWidget>()
        .ShouldBeOfType<BWidget>();
}
```

--------------------------------

### Visualize Registry with Type Scanning and Fallback

Source: https://structuremap.github.io/generics

Demonstrates the VisualizationRegistry combining type scanning with default fallback behavior for log types. This is useful when you have specific visualizers for certain types but want a default for others.

```csharp
[Fact]
public void visualization_registry()
{
    var container = Container.For<VisualizationRegistry>();

    Debug.WriteLine(container.WhatDoIHave(@namespace: "StructureMap.Testing.Acceptance.Visualization"));

    container.GetInstance<IVisualizer<IssueCreated>>()
        .ShouldBeOfType<IssueCreatedVisualizer>();

    container.GetInstance<IVisualizer<IssueResolved>>()
        .ShouldBeOfType<IssueResolvedVisualizer>();

    // We have no special registration for TaskAssigned,
    // so fallback to the default visualizer
    container.GetInstance<IVisualizer<TaskAssigned>>()
        .ShouldBeOfType<DefaultVisualizer<TaskAssigned>>();
}
```

--------------------------------

### Changing Instance Lifecycle

Source: https://structuremap.github.io/registration/configured-instance

Demonstrates how to override the lifecycle of a single IConfiguredInstance using various methods.

```csharp
IConfiguredInstance instance
    = new ConfiguredInstance(typeof(WidgetHolder));

// Use the SingletonThing lifecycle
instance.Singleton();

// or supply an ILifecycle type
instance.SetLifecycleTo<ThreadLocalStorageLifecycle>();

// or supply an ILifecycle object
instance.SetLifecycleTo(new Lifecycles_Samples.MyCustomLifecycle());

// or override to the default "transient" lifecycle
instance.DefaultLifecycle();
```

--------------------------------

### Implement IAutoFactoryConventionProvider

Source: https://structuremap.github.io/autofactory

Interface for providing custom Auto-factory conventions.

```csharp
public interface IAutoFactoryConventionProvider
{
    IAutoFactoryMethodDefinition GetMethodDefinition(MethodInfo methodInfo, IList<object> arguments);

}
```

--------------------------------

### Traditional Singleton Implementation

Source: https://structuremap.github.io/object-lifecycle

Illustrates the classic Singleton pattern, which can lead to negative effects on code maintainability and testability.

```csharp
public class EvilSingleton
{
    public static readonly EvilSingleton Instance = new EvilSingleton();

    private EvilSingleton()
    {
    }

    public void DoSomething()
    {
        // do something with the static data here
    }
}


public class EvilSingletonUser
{
    public void DoWork()
    {
        EvilSingleton.Instance.DoSomething();
    }
}
```

--------------------------------

### Equivalent Registration with Lambda Expressions

Source: https://structuremap.github.io/the-container/forwarding-requests-for-a-type-to-another-type

Achieve the same result as `Forward<TFrom, TTo>()` using lambda registrations. This approach explicitly uses `Use(c => c.GetInstance<StatefulCache>())` for each interface, ensuring they resolve to the same singleton instance.

```csharp
[Fact]
public void equivalent()
{
    var container = new Container(_ =>
    {
        // Let's make StatefulCache a SingletonThing in the container
        _.ForConcreteType<StatefulCache>().Configure.Singleton();

        _.For<IReader>().Use(c => c.GetInstance<StatefulCache>());
        _.For<IWriter>().Use(c => c.GetInstance<StatefulCache>());
    });

    container.GetInstance<IReader>().ShouldBeOfType<StatefulCache>();
    container.GetInstance<IWriter>().ShouldBeOfType<StatefulCache>();
}
```

--------------------------------

### FuncInterceptor Constructor with Expression<Func<T, T>>

Source: https://structuremap.github.io/interception-and-decorators

Creates a FuncInterceptor using a user-supplied expression that takes the object to be decorated and returns the decorated object. An optional description can be provided.

```csharp
public FuncInterceptor(Expression<Func<T, T>> expression, string description = null)
```

--------------------------------

### Build Plan for AppSettingTarget

Source: https://structuremap.github.io/registration/attributes

Displays the StructureMap build plan for `AppSettingTarget`, illustrating how the custom attribute influences dependency injection for constructor parameters and setter properties.

```text
PluginType: StructureMap.Testing.Acceptance.attribute_usage+AppSettingTarget
Lifecycle: Transient
new AppSettingTarget(String name)
  ┗ String name = Value: Jeremy
Set String HomeState = Value: Missouri

```

--------------------------------

### Applying SingletonAttribute to Interfaces and Classes

Source: https://structuremap.github.io/registration/attributes

Demonstrates how to apply the `SingletonAttribute` to an interface to make all its implementations singletons by default, and to a concrete class to make that specific type a singleton.

```csharp
[Singleton] // ALL Instance's of ITeamCache will be singletons by default
public interface ITeamCache { }

public class TeamCache : ITeamCache { }

public class OtherTeamCache : ITeamCache { }

public interface ITeam { }

public class Chargers : ITeam { }

[Singleton] // This specific type will be a singleton
public class Chiefs : ITeam { }
```
Tokens:
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