ExpressionTreeToString

https://github.com/zspitz/expressiontreetostring
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### Collection Initializers

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of collection and list initializers.

```csharp
() => new List<string>() {
    "abcd",
    "efgh"
}
```

```csharp
() => new Wrapper() {
    {
        "ab",
        "cd"
    },
    {
        "ef",
        "gh"
    }
}
```

```csharp
() => new Wrapper() {
    {
        "ab",
        "cd"
    },
    "ef"
}
```

```csharp
() => new Node() {
    Children = {
        new Node(),
        new Node()
    }
}
```

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

### Object Initialization

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of object instantiation and member initialization.

```csharp
() => new Node() {
    Data = {
        Name = "abcd"
    }
}
```

```csharp
() => new Random()
```

```csharp
() => new Foo("ijkl")
```

```csharp
() => new Foo("ijkl") {
    Bar = "abcd",
    Baz = "efgh"
}
```

```csharp
() => new Foo() {
    Bar = "abcd"
}
```

```csharp
() => new Foo() {
    Bar = "abcd",
    Baz = "efgh"
}
```

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

### Array Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of array indexing, length, and initialization.

```vbnet
Function() arr(0)
```

```vbnet
Function() arr.Length
```

```vbnet
Function() arr(5, 6)
```

```vbnet
Function() New String(4)(,) {}
```

```vbnet
Function() arr(5)
```

```vbnet
Function() New String(4)() {}
```

```vbnet
Function() New Object()() { ({ "ab", "cd" }), ({ "ef", "gh" }) }
```

```vbnet
Function() { ({ "ab", "cd" }), ({ "ef", "gh" }) }
```

```vbnet
Function() New String(2, 1)() {}
```

```vbnet
Function() New String(1, 2) {}
```

```vbnet
Function() { "" }
```

```vbnet
Function() New Object() { "" }
```

```vbnet
Function() New String(4) {}
```

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

### Array Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of array indexing, length, and initialization.

```csharp
() => arr[0]
```

```csharp
() => arr.Length
```

```csharp
() => arr[5, 6]
```

```csharp
() => new string[5][,]
```

```csharp
() => arr[5]
```

```csharp
() => new string[5][]
```

```csharp
() => new object[][] { new[] { "ab", "cd" }, new[] { "ef", "gh" } }
```

```csharp
() => new string[][] { new[] { "ab", "cd" }, new[] { "ef", "gh" } }
```

```csharp
() => new string[3, 2][]
```

```csharp
() => new string[2, 3]
```

```csharp
() => new[] { "" }
```

```csharp
() => new object[] { "" }
```

```csharp
() => new string[5]
```

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

### Object and Collection Initialization

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of creating objects and collections with initializers.

```vbnet
Function() New With {
    .Bar = "abcd",
    .Baz = "efgh"
}
```

```vbnet
Function() New With {
    Bar,
    Baz
}
```

```vbnet
Function() New List(Of String) From {
    "abcd",
    "efgh"
}
```

```vbnet
Function() New Wrapper From {
    {
        "ab",
        "cd"
    },
    {
        "ef",
        "gh"
    }
}
```

```vbnet
Function() New Wrapper From {
    {
        "ab",
        "cd"
    },
    "ef"
}
```

```vbnet
Function() New Node With {
    .Children = From {
        New Node,
        New Node
    }
}
```

```vbnet
Function() New Node With {
    .Data = With {
        .Name = "abcd"
    }
}
```

```vbnet
Function() New Random
```

```vbnet
Function() New Foo("ijkl")
```

```vbnet
Function() New Foo("ijkl") With {
    .Bar = "abcd",
    .Baz = "efgh"
}
```

```vbnet
Function() New Foo With {
    .Bar = "abcd"
}
```

```vbnet
Function() New Foo With {
    .Bar = "abcd",
    .Baz = "efgh"
}
```

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

### Collection Initializers

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of initializing collections with single or multiple elements.

```vb
New List(Of String) From {
    "abcd",
    "efgh"
}
```

```vb
New Wrapper From {
    {
        "ab",
        "cd"
    },
    {
        "ef",
        "gh"
    }
}
```

```vb
New Wrapper From {
    {
        "ab",
        "cd"
    },
    "ef"
}
```

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

### Method Invocations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of calling instance, static, and extension methods.

```csharp
() => lst.Count()
```

```csharp
() => lst.ExtensionMethod1Argument(1)
```

```csharp
() => lst.ExtensionMethod2Arguments(5, 17)
```

```csharp
() => s.ToString()
```

```csharp
() => s.CompareTo("")
```

```csharp
() => s.IndexOf('a', 2)
```

```csharp
() => del()
```

```csharp
() => del(5)
```

```csharp
(double x, double y) => Math.Pow(x, y)
```

```csharp
() => Dummy.DummyMethod()
```

```csharp
() => string.Intern("")
```

```csharp
() => string.Join(",", new[] { "a", "b" })
```

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

### String Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of string constants and concatenation operations.

```csharp
Lambda(
    Constant("abcd")
)
```

```csharp
var s1 = Parameter(
    typeof(string),
    "s1"
);
var s2 = Parameter(
    typeof(string),
    "s2"
);

Lambda(
    Call(
        typeof(string).GetMethod("Concat", 0, new[] { typeof(string), typeof(string) }),
        s1, s2
    ),
    s1, s2
)
```

```csharp
var s1 = Parameter(
    typeof(string),
    "s1"
);
var s2 = Parameter(
    typeof(string),
    "s2"
);

Lambda(
    Call(
        typeof(string).GetMethod("Concat", 0, new[] { typeof(string), typeof(string) }),
        s1, s2
    ),
    s1, s2
)
```

```csharp
var s1 = Parameter(
    typeof(string),
    "s1"
);
var s2 = Parameter(
    typeof(string),
    "s2"
);

Lambda(
    Call(
        typeof(string).GetMethod("Concat", 0, new[] { typeof(string[]) }),
        NewArrayInit(
            typeof(string),
            s1, s2, s1, s2, s1, s2
        )
    ),
    s1, s2
)
```

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

### Method Invocations and Members

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of calling methods and accessing members.

```vbnet
Function() lst.Count
```

```vbnet
Function() lst.ExtensionMethod2Arguments(5, 17)
```

```vbnet
Function() s.Length
```

```vbnet
Function() s.ToString
```

```vbnet
Function() s.CompareTo("")
```

```vbnet
Function() s.IndexOf("a"C, 2)
```

```vbnet
Function() del()
```

```vbnet
Function() del(5)
```

```vbnet
Function() String.Empty
```

```vbnet
Sub() Dummy.DummyMethod
```

```vbnet
Function() String.Intern("")
```

```vbnet
Function() String.Join(",", { "a", "b" })
```

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

### Collection Initializer Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of initializing collections with single or multiple elements.

```csharp
new List<string>() {
    "abcd",
    "efgh"
}
```

```csharp
new Wrapper() {
    {
        "ab",
        "cd"
    },
    {
        "ef",
        "gh"
    }
}
```

```csharp
new Wrapper() {
    {
        "ab",
        "cd"
    },
    "ef"
}
```

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

### Array Creation Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of creating arrays and multidimensional arrays.

```csharp
new[] { "abcd", 5, #Random }
```

```csharp
new string[5][,]
```

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

### Parameter Naming

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of unnamed and whitespace-containing parameter names.

```csharp
(string $var0) => $var0 == $var0
```

```csharp
(string $x_y) => $x_y
```

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

### Logical and Comparison Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of logical and comparison operators.

```vbnet
Function() b1 AndAlso b2
```

```vbnet
Function() b1 And b2
```

```vbnet
Function() b1 Xor b2
```

```vbnet
Function() i = j
```

```vbnet
Function() i > j
```

```vbnet
Function() i >= j
```

```vbnet
Function() i < j
```

```vbnet
Function() i <= j
```

```vbnet
Function() Not b
```

```vbnet
Function() i <> j
```

```vbnet
Function() b1 OrElse b2
```

```vbnet
Function() b1 Or b2
```

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

### Named Type Initializers

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of object initialization syntax within expression trees.

```csharp
new Foo() {
    Bar = "abcd"
}
```

```csharp
new Foo() {
    Bar = "abcd",
    Baz = "efgh"
}
```

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

### Label Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of label targets and label expressions.

```csharp
(
    int i,
    (
        int j,
        true,
target:
        true
    )
)
```

```csharp
(
    int i,
    (
        int j,
target:
        true
    )
)
```

```csharp
target
```

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

### Dynamic and Array Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of dynamic operations and array initialization with bounds.

```VB.NET
x + y
```

```VB.NET
CInt(x)
```

```VB.NET
Not b1
```

```VB.NET
Function() New String(bounds) {}
```

```VB.NET
Function() New String(bound1, bound2) {}
```

```VB.NET
Function() New String(bound)() {}
```

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

### Logical and Bitwise Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of logical and bitwise operators.

```csharp
() => b1 && b2
```

```csharp
() => i & j
```

```csharp
() => b1 & b2
```

```csharp
() => ~i
```

```csharp
() => i ^ j
```

```csharp
() => b1 ^ b2
```

```csharp
() => !b
```

```csharp
() => i | j
```

```csharp
() => b1 || b2
```

```csharp
() => b1 | b2
```

```csharp
() => i << j
```

```csharp
() => i >> j
```

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

### SQL Mapping Example

Source: https://github.com/zspitz/expressiontreetostring/wiki/Overview-of-.NET-expression-trees

Demonstrates how LINQ queries are represented as expression trees to be translated into SQL.

```sql
SELECT * FROM Persons WHERE Persons.LastName LIKE N'D%'
```

```csharp
IQueryable<Person> personSource = ... ;
var qry = personQuery.Where(x => x.LastName.StartsWith("D");
```

```vb
Dim personSource As IQueryable(Of Person) = ...
Dim qry = personQuery.Where(Function(x) x.LastName.StartsWith("D))
```

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

### Anonymous Types

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of creating anonymous types.

```csharp
() => new {
    Bar = "abcd",
    Baz = "efgh"
}
```

```csharp
() => new {
    Bar,
    Baz
}
```

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

### Extension Methods

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of calling extension methods with varying arguments and conversions.

```VB.NET
Function() lst.ExtensionMethod1Argument(1)
```

```VB.NET
Function() lst.ExtensionMethod1ArgumentEnumerable(1)
```

```VB.NET
Function() lst.ExtensionMethod2Arguments(5, 17)
```

```VB.NET
Function() lst.ExtensionMethod2ArgumentsEnumerable(5, 6)
```

```C#
Function() lst.ExtensionMethod1Argument(1)
```

```Factory
lstString.ExtensionMethod1Argument(1)
```

```Factory
lstString.ExtensionMethod2Arguments(5, 17)
```

```VB.NET
Function() lst.Count
```

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

### Miscellaneous Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Other miscellaneous expression tree examples.

```csharp
#Random
```

```csharp
(
    string s2,
    true
    // variables -- double x, string s1
)
```

```csharp
s1 + s2
```

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

### Dynamic Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of dynamic member access and method invocation.

```csharp
obj["key"]
```

```csharp
obj["key", 1]
```

```csharp
obj.Data
```

```csharp
obj()
```

```csharp
obj("arg1", 15)
```

```csharp
obj.Method()
```

```csharp
obj.Method("arg1", 15)
```

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

### Member Access and Method Calls

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of accessing instance members and calling methods with various argument counts.

```C#
var s = Parameter(
    typeof(string),
    "s"
);

Lambda(
    MakeMemberAccess(
        s,
        typeof(string).GetProperty("Length")
    )
)
```

```C#
var s = Parameter(
    typeof(string),
    "s"
);

Lambda(
    Call(
        s,
        typeof(string).GetMethod("ToString", new Type[] { })
    )
)
```

```C#
var s = Parameter(
    typeof(string),
    "s"
);

Lambda(
    Call(
        s,
        typeof(string).GetMethod("CompareTo", new[] { typeof(string) }),
        Constant("")
    )
)
```

```C#
var s = Parameter(
    typeof(string),
    "s"
);

Lambda(
    Call(
        s,
        typeof(string).GetMethod("IndexOf", new[] { typeof(char), typeof(int) }),
        Constant('a'),
        Constant(2)
    )
)
```

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

### Conditional and Comparison Operators

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of conditional logic and comparison operators.

```csharp
(int i) => i > 10 ? i : i + 10
```

```csharp
() => i == j
```

```csharp
() => i > j
```

```csharp
() => i >= j
```

```csharp
() => i < j
```

```csharp
() => i <= j
```

```csharp
() => i != j
```

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

### Bitwise and Logical Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of Or, OrElse, and logical Or operations on parameters.

```csharp
var i = Parameter(
    typeof(int),
    "i"
);
var j = Parameter(
    typeof(int),
    "j"
);

Lambda(
    Or(
        i,
        j
    )
)
```

```csharp
var b1 = Parameter(
    typeof(bool),
    "b1"
);
var b2 = Parameter(
    typeof(bool),
    "b2"
);

Lambda(
    OrElse(
        b1,
        b2
    )
)
```

```csharp
var b1 = Parameter(
    typeof(bool),
    "b1"
);
var b2 = Parameter(
    typeof(bool),
    "b2"
);

Lambda(
    Or(
        b1,
        b2
    )
)
```

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

### Invocation Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of invoking delegates with or without arguments.

```C#
var del = Parameter(
    typeof(VB$AnonymousDelegate<int>),
    "del"
);

Lambda(
    Invoke(
        del
    )
)
```

```C#
var del = Parameter(
    typeof(VB$AnonymousDelegate<int, int>),
    "del"
);
```

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

### Arithmetic and Comparison Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of binary operations including division, equality, and bitwise/logical XOR.

```C#
var x = Parameter(
    typeof(double),
    "x"
);
var y = Parameter(
    typeof(double),
    "y"
);

Lambda(
    Divide(
        x,
        y
    )
)
```

```C#
var i = Parameter(
    typeof(int),
    "i"
);
var j = Parameter(
    typeof(int),
    "j"
);

Lambda(
    Equal(
        i,
        j
    )
)
```

```C#
var i = Parameter(
    typeof(int),
    "i"
);
var j = Parameter(
    typeof(int),
    "j"
);

Lambda(
    ExclusiveOr(
        i,
        j
    )
)
```

```C#
var b1 = Parameter(
    typeof(bool),
    "b1"
);
var b2 = Parameter(
    typeof(bool),
    "b2"
);

Lambda(
    ExclusiveOr(
        b1,
        b2
    )
)
```

```C#
var i = Parameter(
    typeof(int),
    "i"
);
var j = Parameter(
    typeof(int),
    "j"
);

Lambda(
    GreaterThan(
        i,
        j
    )
)
```

```C#
var i = Parameter(
    typeof(int),
    "i"
);
var j = Parameter(
    typeof(int),
    "j"
);

Lambda(
    GreaterThanOrEqual(
        i,
        j
    )
)
```

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

### CSCompiler Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of compiler-related expression tree constructions.

```vb
Function(s1 As String, s2 As String) s1 + s2
```

```vb
Function() x - y
```

```vb
Function() True
```

```vb
Function(s1 As String, s2 As String) s1 + s2
```

```vb
Sub(s1 As String, s2 As String) Console.WriteLine(s1 + s2)
```

```vb
Function() GetType(String)
```

```vb
Function() TryCast(o, String)
```

```vb
Function() TypeOf o Is String
```

```vb
Function() lst(3)
```

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

### Block Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of block expressions with varying variable counts.

```csharp
(
    int i,
    string s1,
    true,
    true
)
```

```csharp
(
    true,
    true
)
```

```csharp
(
    int i,
    true,
    true
)
```

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

### Type Check Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of TypeAs and TypeIs expressions.

```C#
Lambda(
    TypeAs(
        o,
        typeof(string)
    )
)
```

```C#
Lambda(
    TypeIs(
        Constant(""),
        typeof(string)
    )
)
```

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

### Constant Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of creating constant expressions for null, reference types, and value types.

```C#
Lambda(
    Constant(null)
)
```

```C#
Lambda(
    Constant(null,
        typeof(string)
    )
)
```

```C#
Lambda(
    Constant(0)
)
```

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

### Indexers and Enum Comparisons

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of array/list indexing and enum comparisons in both VB and C#.

```VB.NET
Function() lst(3)
```

```VB.NET
Function() x(5)
```

```VB.NET
Function() dow >= DayOfWeek.Tuesday
```

```VB.NET
Function() DayOfWeek.Tuesday <= dow
```

```VB.NET
Function() dow1 = dow2
```

```C#
Function() dow >= DayOfWeek.Tuesday
```

```C#
Function() DayOfWeek.Tuesday <= dow
```

```C#
Function() dow1 = dow2
```

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

### Switch Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of Select Case statements used in factory methods.

```VB.NET
Select Case i
    Case 1
        "One"
    Case 2
        "Two"
    Case 3
        "Three"
    Case Else
        "Default"
End Select
```

```VB.NET
Select Case i
    Case 1
        Nothing
        "One"
    Case 2
        Nothing
        "Two"
    Case Else
        Nothing
        "Default"
End Select
```

```VB.NET
Select Case i
    Case 1, 2
        "OneTwo"
    Case 3, 4
        "ThreeFour"
    Case Else
        "Default"
End Select
```

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

### Arithmetic Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of basic arithmetic and bitwise operations in Visual Basic lambdas.

```vbnet
Function() x + y
```

```vbnet
Function() i And j
```

```vbnet
Function() i Or j
```

```vbnet
Function() i Xor j
```

```vbnet
Function() Not i
```

```vbnet
Function() x / y
```

```vbnet
Function() x Mod y
```

```vbnet
Function() x * y
```

```vbnet
Function() -i
```

```vbnet
Function(x As Double, y As Double) x ^ y
```

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

### Division Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of division operations involving type conversions.

```csharp
var x = Parameter(
    typeof(int),
    "x"
);
var y = Parameter(
    typeof(int),
    "y"
);

Lambda(
    Divide(
        Convert(
            x,
            typeof(double)
        ),
        Convert(
            y,
            typeof(double)
        )
    )
)
```

```csharp
var x = Parameter(
    typeof(double),
    "x"
);
var y = Parameter(
    typeof(double),
    "y"
);

Lambda(
    Divide(
        ConvertChecked(
            x,
            typeof(long),
            typeof(Convert).GetMethod("ToInt64", new[] { typeof(double) })
        ),
        ConvertChecked(
            y,
            typeof(long),
            typeof(Convert).GetMethod("ToInt64", new[] { typeof(double) })
        )
    )
)
```

```csharp
var x = Parameter(
    typeof(int),
    "x"
);
var y = Parameter(
    typeof(int),
    "y"
);


```

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

### Indexer Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Examples of property access via indexers for standard and custom types.

```C#
var lst = Parameter(
    typeof(List<string>),
    "lst"
);

Lambda(
    Property(
        lst,
        typeof(List<string>).GetProperty("Item"),
        Constant(3)
    )
)
```

```C#
var x = Parameter(
    typeof(DummyWithDefault),
    "x"
);

Lambda(
    Property(
        x,
        typeof(DummyWithDefault).GetProperty("Item"),
        Constant(5)
    )
)
```

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

### Catch Block Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of catch blocks with various filters and types.

```csharp
catch (Exception ex) {
    Console.WriteLine(true);
    Console.WriteLine(true);
}
```

```csharp
catch (Exception ex) when (true) {
    Console.WriteLine(true);
    Console.WriteLine(true);
}
```

```csharp
catch (InvalidCastException) {
    Console.WriteLine(true);
    Console.WriteLine(true);
}
```

```csharp
catch (Exception ex) {
    Console.WriteLine(true);
}
```

```csharp
catch (Exception ex) when (true) {
    Console.WriteLine(true);
}
```

```csharp
catch (InvalidCastException) {
    Console.WriteLine(true);
}
```

```csharp
catch (Exception ex) when (
    true,
    true
) {
    Console.WriteLine(true);
}
```

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

### Nested Lambdas and Char Equality

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of nested lambda expressions and character equality checks.

```C#
Function() Function() Function() ""
```

```VB.NET
Function() Function() ""
```

```C#
Function() "abcd"(0) = "c"C
```

```C#
Function() "c"C = "abcd"(0)
```

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

### Arithmetic Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of basic arithmetic operations within lambda expressions.

```csharp
() => x + y
```

```csharp
() => x / y
```

```csharp
() => x % y
```

```csharp
() => x * y
```

```csharp
() => x - y
```

```csharp
() => -i
```

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

### Constructing an If-Else Block

Source: https://github.com/zspitz/expressiontreetostring/wiki/BlockExpression-rendering-in-C

Example of an if-else structure using standard C# syntax.

```csharp
if (DateTime.Now.Hour < 18) {
    Console.WriteLine("Good day");
    Console.WriteLine("Have a nice day");
} else {
    Console.WriteLine("Good night");
    Console.WriteLine("Have a nice night");
}
```

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

### Represent a nested expression tree

Source: https://github.com/zspitz/expressiontreetostring/wiki/Overview-of-.NET-expression-trees

An example showing how expressions can be nested to form a tree structure.

```csharp
 (x + 17) * 5
 |------|  |-|       inner expressions
|------------|       outer expression
```

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

### Represent a simple addition expression

Source: https://github.com/zspitz/expressiontreetostring/wiki/Overview-of-.NET-expression-trees

A basic example of a C# expression involving a parameter and a constant.

```csharp
x + 17
```

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

### String Concatenation and Operators

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of string concatenation and arithmetic operations in VB.NET.

```VB.NET
Function() "abcd"
```

```VB.NET
Function(s1 As String, s2 As String) s1 + s2
```

```VB.NET
Function(s1 As String, s2 As String) s1 + s2 + s1 + s2 + s1 + s2
```

```VB.NET
Function() x - y
```

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

### Switch Case Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of Select Case statements with single or multiple values and default cases.

```Visual Basic
Case 5, 6
    Console.WriteLine(True)
    Console.WriteLine(True)
```

```Visual Basic
Case 5, 6
    Console.WriteLine(True)
```

```Visual Basic
Case 5
    Console.WriteLine(True)
    Console.WriteLine(True)
```

```Visual Basic
Case 5
    Console.WriteLine(True)
```

```Visual Basic
Select Case i
    Case 4
        Console.WriteLine(True)
    Case 5
        Console.WriteLine(False)
    Case Else
        True
        True
End Select
```

```Visual Basic
Select Case i
    Case 4
        Console.WriteLine(True)
    Case 5
        Console.WriteLine(False)
    Case Else
        CType(Nothing, Void)
End Select
```

```Visual Basic
Select Case i
    Case 4
        Console.WriteLine(True)
    Case 5
        Console.WriteLine(False)
End Select
```

```Visual Basic
Select Case Block
        i
        j
    End Block
    Case 4
        Console.WriteLine(True)
    Case 5
        Console.WriteLine(False)
    Case Else
        True
        True
End Select
```

```Visual Basic
Select Case Block
        i
        j
    End Block
    Case 4
        Console.WriteLine(True)
    Case 5
        Console.WriteLine(False)
End Select
```

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

### Required Generic Parameters

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Example of a Lambda expression calling a method with generic parameters.

```csharp
Lambda(
    Call(
        typeof(Dummy).GetMethod("DummyMethodWithGenerics")
    )
)
```

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

### Object Creation and Initializers

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Constructing objects with parameters and property initializers.

```Visual Basic
New Random
```

```Visual Basic
New Foo("ijkl")
```

```Visual Basic
New Foo("ijkl") With {
    .Bar = "abcd",
    .Baz = "efgh"
}
```

```Visual Basic
New Foo With {
    .Bar = "abcd"
}
```

```Visual Basic
New Foo With {
    .Bar = "abcd",
    .Baz = "efgh"
}
```

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

### Make Element Init

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates element initialization expressions.

```csharp
"abcd"
```

```csharp
{
    "abcd",
    "efgh"
}
```

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

### Parameter Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Demonstrates creating parameters with and without names.

```csharp
var $var0 = Parameter(
    typeof(string)
);

Lambda(
    MakeBinary(ExpressionType.Equal, $var0, $var0, false,
        typeof(string).GetMethod("op_Equality")
    ),
    $var0
)
```

```csharp
var $x_y = Parameter(
    typeof(string),
    "x y"
);

Lambda($x_y, $x_y)
```

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

### Render Extension Methods

Source: https://github.com/zspitz/expressiontreetostring/blob/master/README.md

Shows how extension methods are rendered as instance methods in the output.

```csharp
Expression<Func<int, int>> expr = x => Enumerable.Range(1, x).Select(y => x * y).Count();
Console.WriteLine(expr.ToString("C#"));
// prints: (int x) => Enumerable.Range(1, x).Select((int y) => x * y).Count()
```

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

### Extension Method Calls with Conversion

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Shows how to call extension methods with parameter conversions.

```csharp
var lst = Parameter(
    typeof(List<string>),
    "lst"
);

Lambda(
    Call(
        typeof(Dummy).GetMethod("ExtensionMethod1ArgumentEnumerable"),
        Convert(
            lst,
            typeof(IEnumerable<string>)
        ),
        Constant(1)
    )
)
```

```csharp
var lst = Parameter(
    typeof(List<string>),
    "lst"
);

Lambda(
    Call(
        typeof(Dummy).GetMethod("ExtensionMethod2ArgumentsEnumerable"),
        Convert(
            lst,
            typeof(IEnumerable<string>)
        ),
        Constant(5),
        Constant(6)
    )
)
```

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

### Make Goto

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates goto expressions.

```csharp
goto target
```

```csharp
goto target 5
```

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

### Query database with supported methods

Source: https://github.com/zspitz/expressiontreetostring/wiki/Why-can't-I-use-my-function-in-a-database-query

A working LINQ query using StartsWith, which is supported by most database providers.

```vb
Class MyDbContext
    Inherits DbContext
    Property Persons As DbSet(Of Person)
    Protected Overrides Sub OnConfiguring(optionsBuilder As DbContextOptionsBuilder)
        optionsBuilder.UseSqlite("DataSource=People.db")
    End Sub
End Class

Dim ctx = New MyDbContext
Dim qry =
    From person In ctx.Person
    Where person.LastName.StartsWith("A")
    Select person

For Each person In qry
    Dim output = $"LastName: {person.LastName}, FirstName: {person.FirstName}, DateOfBirth: {person.DateOfBirth}"
    Console.WriteLine(output)
Next
```

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

### Create Member and List Bindings

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Constructs bindings for member initialization and list collection initialization.

```csharp
ListBind(
    typeof(Node).GetProperty("Children", BindingFlags.Instance | BindingFlags.NonPublic),
    ElementInit(
        typeof(ICollection<Node>).GetMethod("Add"),
        New(
            typeof(Node).GetConstructor(new Type[] { })
        )
    ),
    ElementInit(
        typeof(ICollection<Node>).GetMethod("Add"),
        New(
            typeof(Node).GetConstructor(new Type[] { })
        )
    )
)
```

```csharp
Bind(
    typeof(DummyMember).GetProperty("Foo", BindingFlags.Instance | BindingFlags.NonPublic),
    Constant("abcd")
)
```

```csharp
MemberBind(
    typeof(Node).GetProperty("Data", BindingFlags.Instance | BindingFlags.NonPublic),
    Bind(
        typeof(NodeData).GetProperty("Name", BindingFlags.Instance | BindingFlags.NonPublic),
        Constant("abcd")
    )
)
```

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

### Make Element Initialization with 2 Arguments

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Creates an element initialization expression with two arguments.

```vb
{
    "abcd",
    "efgh"
}
```

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

### Make Return

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates return expressions.

```csharp
return target
```

```csharp
return target 5
```

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

### Instance Method with 2 Arguments

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Calls an instance method with two arguments.

```vb
s.IndexOf("a"C, 2)
```

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

### Collection Initializers

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Initializes collections with various element structures.

```csharp
() => new List<string>() {
    "abcd",
    "efgh"
}
```

```csharp
() => new Wrapper() {
    {
        "ab",
        "cd"
    },
    {
        "ef",
        "gh"
    }
}
```

```csharp
() => new Wrapper() {
    {
        "ab",
        "cd"
    },
    "ef"
}
```

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

### Instance Method

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates instance method invocation expressions with varying arguments.

```csharp
s.ToString()
```

```csharp
s.CompareTo("")
```

```csharp
s.IndexOf('a', 2)
```

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

### Instance Method with 0 Arguments

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Calls an instance method with no arguments.

```vb
s.ToString
```

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

### Make Element Initialization

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Creates an element initialization expression.

```vb
"abcd"
```

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

### Boolean and Type Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Examples of boolean constants, type casting, and type checking.

```VB.NET
Function() True
```

```VB.NET
Function() TryCast(o, String)
```

```VB.NET
Function() TypeOf "" Is String
```

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

### Compiling and invoking expression trees

Source: https://github.com/zspitz/expressiontreetostring/wiki/Overview-of-.NET-expression-trees

Shows how to convert an expression block into a compiled delegate and execute it.

```csharp
Expression<Action> expr = Lambda<Action>(block);
Action action = expr.Compile();
```

```csharp
action.Invoke();
```

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

### Make Debug Info

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates debug information markers.

```csharp
// Debug to source.txt -- L1C2 : L3C4
```

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

### Collection Initializer

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Initializes a List<string> with two elements.

```csharp
Lambda(
    ListInit(
        New(
            typeof(List<string>).GetConstructor(new Type[] { })
        ),
        ElementInit(
            typeof(List<string>).GetMethod("Add"),
            Constant("abcd")
        ),
        ElementInit(
            typeof(List<string>).GetMethod("Add"),
            Constant("efgh")
        )
    )
)
```

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

### Array Initialization and Bounds

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Creates array initialization and bounds expressions.

```csharp
Lambda(
    NewArrayInit(
        typeof(string),
        Constant("")
    )
)
```

```csharp
Lambda(
    NewArrayInit(
        typeof(object),
        Convert(
            Constant(""),
            typeof(object)
        )
    )
)
```

```csharp
Lambda(
    NewArrayBounds(
        typeof(string),
        Constant(5)
    )
)
```

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

### VBCompiler Like Operator

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Demonstrates string and object comparison using the Like operator.

```csharp
(string s1, string s2) => LikeOperator.LikeString(s1, s2, CompareMethod.Binary)
```

```csharp
(object o1, object o2) => LikeOperator.LikeObject(o1, o2, CompareMethod.Binary)
```

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

### Nested Block in Test

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Examples of block structures used within conditional test expressions.

```csharp
if (
    true,
    true,
    true,
    true
) {
    true;
}
```

```csharp
if (
    true,
    (
        string s1,
        true,
        true
    ),
    true
) {
    true;
}
```

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

### Construct Label Targets

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Creates label targets and empty labels.

```C#
Label("")
```

```C#
Label("target")
```

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

### Collection Initializers

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Constructs ListInit expressions with various element initializers.

```csharp
ListInit(
    New(
        typeof(List<string>).GetConstructor(new Type[] { })
    ),
    ElementInit(
        typeof(List<string>).GetMethod("Add"),
        Constant("abcd")
    ),
    ElementInit(
        typeof(List<string>).GetMethod("Add"),
        Constant("efgh")
    )
)
```

```csharp
ListInit(
    New(
        typeof(Wrapper).GetConstructor(new Type[] { })
    ),
    ElementInit(
        typeof(Wrapper).GetMethod("Add", BindingFlags.Instance | BindingFlags.NonPublic),
        Constant("ab"),
        Constant("cd")
    ),
    ElementInit(
        typeof(Wrapper).GetMethod("Add", BindingFlags.Instance | BindingFlags.NonPublic),
        Constant("ef"),
        Constant("gh")
    )
)
```

```csharp
ListInit(
    New(
        typeof(Wrapper).GetConstructor(new Type[] { })
    ),
    ElementInit(
        typeof(Wrapper).GetMethod("Add", BindingFlags.Instance | BindingFlags.NonPublic),
        Constant("ab"),
        Constant("cd")
    ),
    ElementInit(
        typeof(List<string>).GetMethod("Add"),
        Constant("ef")
    )
)
```

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

### Invalid BlockExpression Usage

Source: https://github.com/zspitz/expressiontreetostring/wiki/BlockExpression-rendering-in-C

Example of a BlockExpression used in a test clause where it is not supported by standard C# syntax.

```text
if ({
    true;
    true;
}) {
    Console.WriteLine(true);
}
```

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

### Arrays and Tuples

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Initialization of arrays and creation of tuples.

```Visual Basic
{ "" }
```

```Visual Basic
New Object() { "" }
```

```Visual Basic
New String(4) {}
```

```Visual Basic
Tuple.Create("abcd", 5)
```

```Visual Basic
("abcd", 5)
```

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

### Construct Label with Value

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Demonstrates the use of FactoryMethods.ConstructLabelWithValue to create a block containing parameters and a labeled constant.

```csharp
var i = Parameter(
    typeof(int),
    "i"
);
var j = Parameter(
    typeof(int),
    "j"
);

Block(new[] { i },
    Block(new[] { j },
        Constant(true),
        Label(
            Label("target"),
            Constant(5)
        ),
        Constant(true)
    )
)
```

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

### Retrieve Node Path Spans

Source: https://github.com/zspitz/expressiontreetostring/blob/master/README.md

Extracts the start and length of substrings corresponding to specific nodes in the expression tree.

```csharp
var s = expr.ToString("C#", out var pathSpans);
Console.WriteLine(s);
// prints: (Person p) => p.DOB.DayOfWeek == DayOfWeek.Tuesday

(int start, int length) = pathSpans["Body.Left.Operand"];
Console.WriteLine(s.Substring(start, length));
// prints: p.DOB.DayOfWeek
```

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

### Instance Indexer

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates an instance indexer access expression.

```csharp
lstString[0]
```

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

### Retrieve test objects

Source: https://github.com/zspitz/expressiontreetostring/blob/master/TestObjects.VB/README.md

Use the static Get method to retrieve a collection of expression tree objects. The returned array contains category, source, name, and the object itself.

```csharp
// using ExpressionTreeTestObjects;

(string category, string source, string name, object o)[] lst = Objects.Get();
```

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

### Member Member Binding

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Demonstrates nested member initialization and binding within an expression tree.

```csharp
Lambda(
    MemberInit(
        New(
            typeof(Node).GetConstructor(new Type[] { })
        ),
        MemberBind(
            typeof(Node).GetProperty("Data", BindingFlags.Instance | BindingFlags.NonPublic),
            Bind(
                typeof(NodeData).GetProperty("Name", BindingFlags.Instance | BindingFlags.NonPublic),
                Constant("abcd")
            )
        )
    )
)
```

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

### VBCompiler Array Indexing Expressions

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Demonstrates various array indexing and length operations.

```csharp
var arr = Parameter(
    typeof(string[]),
    "arr"
);

Lambda(
    ArrayIndex(
        arr,
        Constant(0)
    )
)
```

```csharp
var arr = Parameter(
    typeof(string[]),
    "arr"
);

Lambda(
    ArrayLength(
        arr
    )
)
```

```csharp
var arr = Parameter(
    typeof(string[,]),
    "arr"
);

Lambda(
    ArrayIndex(
        arr,
        Constant(5),
        Constant(6)
    )
)
```

```csharp
var arr = Parameter(
    typeof(string[]),
    "arr"
);

Lambda(
    ArrayIndex(
        arr,
        Constant(5)
    )
)
```

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

### Register a custom renderer

Source: https://github.com/zspitz/expressiontreetostring/wiki/Extensibility-and-plugin-mechanism

Register a new renderer with a unique string key.

```csharp
// using ExpressionTreeToString
Renderers.Register(
    "DummyRenderer",
    (o, language, usePathSpans) => "Hello world!", null)
);
```

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

### Named Type Instantiation

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creating instances of classes with optional constructors and initializers.

```csharp
() => new Random()
```

```csharp
() => new Foo("ijkl")
```

```csharp
() => new Foo("ijkl") {
    Bar = "abcd",
    Baz = "efgh"
}
```

```csharp
() => new Foo() {
    Bar = "abcd"
}
```

```csharp
() => new Foo() {
    Bar = "abcd",
    Baz = "efgh"
}
```

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

### Equality and Comparison

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Comparison operators for equality, inequality, and magnitude.

```csharp
() => i == j
```

```csharp
() => i > j
```

```csharp
() => i >= j
```

```csharp
() => i < j
```

```csharp
() => i <= j
```

```csharp
() => i != j
```

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

### Make List Binding

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates a list binding expression.

```csharp
Children = {
    new Node(),
    new Node()
}
```

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

### Mixed Collection Initializer

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Initializes a collection using both custom wrapper and standard list methods.

```csharp
Lambda(
    ListInit(
        New(
            typeof(Wrapper).GetConstructor(new Type[] { })
        ),
        ElementInit(
            typeof(Wrapper).GetMethod("Add", BindingFlags.Instance | BindingFlags.NonPublic),
            Constant("ab"),
            Constant("cd")
        ),
        ElementInit(
            typeof(List<string>).GetMethod("Add"),
            Constant("ef")
        )
    )
)
```

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

### Array Creation with Bounds

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creating single, multi-dimensional, and jagged arrays with dynamic bounds.

```csharp
() => new string[bounds + 1]
```

```csharp
() => new string[bound1 + 1, bound2 + 1]
```

```csharp
() => new string[bound + 1][]
```

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

### Make List Binding

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Creates a list binding expression.

```vb
.Children = From {
    New Node,
    New Node
}
```

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

### Specify Visual Basic language for factory method rendering

Source: https://github.com/zspitz/expressiontreetostring/wiki/Home

Demonstrates setting the language parameter to 'Visual Basic' when using the factory methods renderer.

```csharp
Console.WriteLine(expr.ToString("Factory methods", "Visual Basic"));
/*
    ' Imports System.Linq.Expressions.Expression

    Lambda(
        Call(
            MakeMemberAccess(p,
                GetType(Person).GetProperty("LastName")
            ),
            GetType(String).GetMethod("StartsWith", { GetType(String) }),
            Constant("A")
        ),
        Dim p = Parameter(
            GetType(Person),
            "p"
        )
    )
*/
```

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

### Make Continue

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates a continue expression.

```csharp
continue target
```

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

### Instance Indexer

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Accesses an instance indexer.

```vb
lstString(0)
```

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

### Collection Initializer with Multiple Elements

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Initializes a custom wrapper with multiple element initializers.

```csharp
Lambda(
    ListInit(
        New(
            typeof(Wrapper).GetConstructor(new Type[] { })
        ),
        ElementInit(
            typeof(Wrapper).GetMethod("Add", BindingFlags.Instance | BindingFlags.NonPublic),
            Constant("ab"),
            Constant("cd")
        ),
        ElementInit(
            typeof(Wrapper).GetMethod("Add", BindingFlags.Instance | BindingFlags.NonPublic),
            Constant("ef"),
            Constant("gh")
        )
    )
)
```

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

### Instance Member Access

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Accessing properties and methods on an instance.

```csharp
() => s.Length
```

```csharp
() => s.ToString()
```

```csharp
() => s.CompareTo("")
```

```csharp
() => s.IndexOf('a', 2)
```

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

### Make Goto With Value

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Creates a goto expression with a value.

```vb
Goto target 5
```

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

### Create Element Initialization

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Constructs element initialization expressions for collection initializers.

```csharp
ElementInit(
    typeof(List<string>).GetMethod("Add"),
    Constant("abcd")
)
```

```csharp
ElementInit(
    typeof(Wrapper).GetMethod("Add", BindingFlags.Instance | BindingFlags.NonPublic),
    Constant("abcd"),
    Constant("efgh")
)
```

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

### Instance Method with 1 Argument

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Calls an instance method with one argument.

```vb
s.CompareTo("")
```

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

### Construct Power Operations

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Creates power and power assignment expressions.

```C#
Power(x, y)
```

```C#
PowerAssign(x, y)
```

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

### Instance Method Call (0 Arguments)

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Constructs a lambda expression calling the ToString method on a string parameter.

```csharp
var s = Parameter(
    typeof(string),
    "s"
);

Lambda(
    Call(
        s,
        typeof(object).GetMethod("ToString")
    )
)
```

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

### Render Enum Comparisons

Source: https://github.com/zspitz/expressiontreetostring/blob/master/README.md

Shows how enum comparisons are rendered correctly without being converted to integer values.

```csharp
var dow = DayOfWeek.Sunday;
Expression<Func<bool>> expr = () => DateTime.Today.DayOfWeek == dow;

Console.WriteLine(expr.ToString("Textual tree", "C#"));
// prints:
/*
  Lambda (Func<bool>)
      · Body - Equal (bool) = false
          · Left - Convert (int) = 3
              · Operand - MemberAccess (DayOfWeek) DayOfWeek = DayOfWeek.Wednesday
                  · Expression - MemberAccess (DateTime) DateTime.Today = 30/09/2020 12:00:00 am
          · Right - Convert (int) = 0
              · Operand - MemberAccess (DayOfWeek) dow = DayOfWeek.Sunday
                  · Expression - Constant (<closure>) = #<closure>      
*/

Console.WriteLine(expr.ToString("C#"));
// prints: () => DateTime.Today.DayOfWeek == dow
```

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

### Make Quoted

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/csharp-testdata.txt

Creates quoted expression trees.

```csharp
(
    double x,
    () => Console.WriteLine(true)
)
```

```csharp
() => () => Console.WriteLine(true)
```

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

### Make Return Expression

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Creates a return expression.

```vb
Return target
```

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

### Instance Method Call (1 Argument)

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Constructs a lambda expression calling CompareTo on a string parameter with one argument.

```csharp
var s = Parameter(
    typeof(string),
    "s"
);

Lambda(
    Call(
        s,
        typeof(string).GetMethod("CompareTo", new[] { typeof(string) }),
        Constant("")
    )
)
```

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

### Extension Method with 0 Arguments

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/visualbasic-testdata.txt

Calls an extension method with no arguments.

```vb
lstString.Count
```

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

### Arithmetic and Logical Factory Methods

Source: https://github.com/zspitz/expressiontreetostring/blob/master/Tests/expectedResults/factorymethods-testdata.txt

Constructs various arithmetic and logical expressions.

```csharp
Add(x, y)
```

```csharp
AddAssign(i, j)
```

```csharp
AddAssignChecked(i, j)
```

```csharp
AddChecked(x, y)
```

```csharp
AndAlso(b1, b2)
```

```csharp
AndAssign(b1, b2)
```

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

### Compile and Execute Expression Trees

Source: https://github.com/zspitz/expressiontreetostring/wiki/Overview-of-.NET-expression-trees

Wraps an expression in a lambda and compiles it for dynamic execution at runtime.

```csharp
var lambdaExpression = Lambda(
    expr,
    prm
);
string iToString = lambdaExpression.Compile().DynamicInvoke(17) as string;
// == "17"
```
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