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Luke Latham 2018-04-18 12:38:44 -05:00 committed by Scott Addie
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aspnetcore/fundamentals/primitives/change-tokens.md
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@ -54,16 +54,16 @@ Change tokens are used in prominent areas of ASP.NET Core monitoring changes to
By default, ASP.NET Core templates use [JSON configuration files](xref:fundamentals/configuration/index#json-configuration) (*appsettings.json*, *appsettings.Development.json*, and *appsettings.Production.json*) to load app configuration settings.
These files are configured using the [AddJsonFile(IConfigurationBuilder, String, Boolean, Boolean)](/dotnet/api/microsoft.extensions.configuration.jsonconfigurationextensions.addjsonfile?view=aspnetcore-2.0#Microsoft_Extensions_Configuration_JsonConfigurationExtensions_AddJsonFile_Microsoft_Extensions_Configuration_IConfigurationBuilder_System_String_System_Boolean_System_Boolean_) extension method on [ConfigurationBuilder](/dotnet/api/microsoft.extensions.configuration.configurationbuilder) that accepts a `reloadOnChange` parameter (ASP.NET Core 1.1 and later). `reloadOnChange` indicates if configuration should be reloaded on file changes. See this setting in the [WebHost](/dotnet/api/microsoft.aspnetcore.webhost) convenience method [CreateDefaultBuilder](/dotnet/api/microsoft.aspnetcore.webhost.createdefaultbuilder) ([reference source](https://github.com/aspnet/MetaPackages/blob/rel/2.0.3/src/Microsoft.AspNetCore/WebHost.cs#L152-L193)):
These files are configured using the [AddJsonFile(IConfigurationBuilder, String, Boolean, Boolean)](/dotnet/api/microsoft.extensions.configuration.jsonconfigurationextensions.addjsonfile?view=aspnetcore-2.0#Microsoft_Extensions_Configuration_JsonConfigurationExtensions_AddJsonFile_Microsoft_Extensions_Configuration_IConfigurationBuilder_System_String_System_Boolean_System_Boolean_) extension method on [ConfigurationBuilder](/dotnet/api/microsoft.extensions.configuration.configurationbuilder) that accepts a `reloadOnChange` parameter (ASP.NET Core 1.1 and later). `reloadOnChange` indicates if configuration should be reloaded on file changes. See this setting in the [WebHost](/dotnet/api/microsoft.aspnetcore.webhost) convenience method [CreateDefaultBuilder](/dotnet/api/microsoft.aspnetcore.webhost.createdefaultbuilder):
```csharp
config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
```
File-based configuration is represented by [FileConfigurationSource](/dotnet/api/microsoft.extensions.configuration.fileconfigurationsource). `FileConfigurationSource` uses [IFileProvider](/dotnet/api/microsoft.extensions.fileproviders.ifileprovider) ([reference source](https://github.com/aspnet/FileSystem/blob/patch/2.0.1/src/Microsoft.Extensions.FileProviders.Abstractions/IFileProvider.cs)) to monitor files.
File-based configuration is represented by [FileConfigurationSource](/dotnet/api/microsoft.extensions.configuration.fileconfigurationsource). `FileConfigurationSource` uses [IFileProvider](/dotnet/api/microsoft.extensions.fileproviders.ifileprovider) to monitor files.
By default, the `IFileMonitor` is provided by a [PhysicalFileProvider](/dotnet/api/microsoft.extensions.fileproviders.physicalfileprovider) ([reference source](https://github.com/aspnet/Configuration/blob/patch/2.0.1/src/Microsoft.Extensions.Configuration.FileExtensions/FileConfigurationSource.cs#L82)), which uses [FileSystemWatcher](/dotnet/api/system.io.filesystemwatcher) to monitor for configuration file changes.
By default, the `IFileMonitor` is provided by a [PhysicalFileProvider](/dotnet/api/microsoft.extensions.fileproviders.physicalfileprovider), which uses [FileSystemWatcher](/dotnet/api/system.io.filesystemwatcher) to monitor for configuration file changes.
The sample app demonstrates two implementations for monitoring configuration changes. If either the *appsettings.json* file changes or the Environment version of the file changes, each implementation executes custom code. The sample app writes a message to the console.
@ -169,7 +169,7 @@ The page model loads the file's content using the service (*Pages/Index.cshtml.c
## CompositeChangeToken class
For representing one or more `IChangeToken` instances in a single object, use the [CompositeChangeToken](/dotnet/api/microsoft.extensions.primitives.compositechangetoken) class ([reference source](https://github.com/aspnet/Common/blob/patch/2.0.1/src/Microsoft.Extensions.Primitives/CompositeChangeToken.cs)).
For representing one or more `IChangeToken` instances in a single object, use the [CompositeChangeToken](/dotnet/api/microsoft.extensions.primitives.compositechangetoken) class.
```csharp
var firstCancellationTokenSource = new CancellationTokenSource();