``` -------------------------------- ### web.config with two EnvironmentConfigBuilder entries using distinct prefixes Source: https://learn.microsoft.com/aspnet/config-builder Use this XML configuration to define two EnvironmentConfigBuilder instances in Greedy mode with distinct prefixes (AppSetting_ and ConnStr_) so that a flat environment variable source can populate both appSettings and connectionStrings sections. The configBuilders attributes on the appSettings and connectionStrings elements reference the respective builders. This approach allows reading both sections without updating the configuration file when environment variables are set. ```XML

> ``` -------------------------------- ### Custom KeyValueConfigBuilder implementation in C# Source: https://learn.microsoft.com/aspnet/config-builder Inherit from KeyValueConfigBuilder and implement GetValue and GetAllValues to provide custom key/value pairs. The base class handles substitution modes and prefix concerns. The GetValue method should be case-insensitive, and GetAllValues should return a collection of key/value pairs. ```csharp using Microsoft.Configuration.ConfigurationBuilders; using System.Collections.Generic; public class MyCustomConfigBuilder : KeyValueConfigBuilder { public override string GetValue(string key) { // Key lookup should be case-insensitive, because most key/value collections in // .NET Framework config sections are case-insensitive. return "Value for given key, or null."; } public override ICollection> GetAllValues(string prefix) { // Populate the return collection. return new Dictionary() { { "one", "1" }, { "two", "2" } }; } } ``` -------------------------------- ### C# code-behind reading appSettings and connectionStrings from configuration Source: https://learn.microsoft.com/aspnet/config-builder This C# code reads the appSettings and connectionStrings values from the configuration, using the keys defined in the web.config file. It sets properties for ServiceID, AppSetting_default, and ConString by accessing ConfigurationManager.AppSettings and ConfigurationManager.ConnectionStrings. The values come from environment variables if set, otherwise from the web.config file. ```C# public partial class Contact : Page { public string ServiceID { get; set; } public string AppSetting_default { get; set; } public string ConString { get; set; } protected void Page_Load(object sender, EventArgs e) { ServiceID = ConfigurationManager.AppSettings["AppSetting_ServiceID"]; AppSetting_default = ConfigurationManager.AppSettings["AppSetting_default"]; ConString = ConfigurationManager.ConnectionStrings["ConnStr_default"] ?.ConnectionString; } } ``` -------------------------------- ### KeyPerFileConfigBuilder XML configuration Source: https://learn.microsoft.com/aspnet/config-builder Configures the KeyPerFileConfigBuilder to read configuration values from files in a directory. The directoryPath attribute is required. Other attributes control prefix handling, key delimiters, and error behavior. ```xml ``` -------------------------------- ### web.config: Enable EnvironmentConfigBuilder in Strict mode Source: https://learn.microsoft.com/aspnet/config-builder Configures the EnvironmentConfigBuilder in Strict mode for appSettings and connectionStrings. The builder replaces values from environment variables when keys match; otherwise, values from web.config are used. Requires the configBuilders section declaration and the builder registration. ```XML

``` ```C# using System; using System.Configuration; using System.Web.UI; namespace MyConfigBuilders { public partial class About : Page { public string ServiceID { get; set; } public string ServiceKey { get; set; } public string ConString { get; set; } protected void Page_Load(object sender, EventArgs e) { ServiceID = ConfigurationManager.AppSettings["ServiceID"]; ServiceKey = ConfigurationManager.AppSettings["ServiceKey"]; ConString = ConfigurationManager.ConnectionStrings["default"] ?.ConnectionString; } } } ``` -------------------------------- ### C# code reading appSettings and connectionStrings Source: https://learn.microsoft.com/aspnet/config-builder C# code that reads the appSettings and connectionStrings from the preceding web.config. It sets properties from ConfigurationManager.AppSettings and ConnectionStrings, using null-conditional operator for the connection string. ```C# public partial class About2 : Page { public string ServiceID { get; set; } public string AppSetting_default { get; set; } public string ConString { get; set; } protected void Page_Load(object sender, EventArgs e) { ServiceID = ConfigurationManager.AppSettings["ServiceID"]; AppSetting_default = ConfigurationManager.AppSettings["default"]; ConString = ConfigurationManager.ConnectionStrings["default"] ?.ConnectionString; } } ``` -------------------------------- ### SimpleJsonConfigBuilder XML configuration Source: https://learn.microsoft.com/aspnet/config-builder Declares the SimpleJsonConfigBuilder in a configuration file. The jsonFile attribute is required and can use '~' to reference the app root. The optional attribute defaults to true, preventing exceptions if the file is missing. jsonMode defaults to Flat. ```xml ``` -------------------------------- ### EnvironmentConfigBuilder XML configuration Source: https://learn.microsoft.com/aspnet/config-builder Adds the EnvironmentConfigBuilder to read values from environment variables. The name attribute is arbitrary, and no additional configuration options are available. ```XML ``` -------------------------------- ### UserSecretsConfigBuilder XML configuration Source: https://learn.microsoft.com/aspnet/config-builder Adds the UserSecretsConfigBuilder to read secrets from a file. Requires either userSecretsId or userSecretsFile attribute; userSecretsFile takes precedence if both are specified. The optional attribute defaults to true to prevent exceptions if the file is missing. ```XML ``` -------------------------------- ### Secrets file XML format Source: https://learn.microsoft.com/aspnet/config-builder The secrets file format used by UserSecretsConfigBuilder. The XML formatting is an implementation detail and should not be relied upon. ```XML ``` -------------------------------- ### AzureKeyVaultConfigBuilder XML configuration Source: https://learn.microsoft.com/aspnet/config-builder Configures the AzureKeyVaultConfigBuilder to read secrets from Azure Key Vault. The vaultName attribute is required unless uri is provided. Other attributes control vault connection and secret retrieval behavior. ```xml ``` === COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.