ServiceExtensions.GetService Method

Definition

Namespace:

Microsoft.VisualStudio.Shell

Assembly:

Microsoft.VisualStudio.Shell.15.0.dll

Package:

Microsoft.VisualStudio.Shell.15.0 v17.12.40392

Overloads

GetService<TService,TInterface>(IServiceProvider)	Retrieves a proffered service synchronously, throwing an exception if it could not be retrieved.
GetService<TService,TInterface>(IServiceProvider, Boolean)	Retrieves a proffered service synchronously, specifying whether to throw an exception if it could not be retrieved.

GetService<TService,TInterface>(IServiceProvider)

Retrieves a proffered service synchronously, throwing an exception if it could not be retrieved.

public:
generic <typename TService, typename TInterface>
 where TInterface : class[System::Runtime::CompilerServices::Extension]
 static TInterface GetService(IServiceProvider ^ sp);

public static TInterface GetService<TService,TInterface> (this IServiceProvider sp) where TInterface : class;

static member GetService : IServiceProvider -> 'Interface (requires 'Interface : null)

<Extension()>
Public Function GetService(Of TService, TInterface) (sp As IServiceProvider) As TInterface

Type Parameters

TService

The service identity of the proffered service to retrieve.

TInterface

The interface used to interact with the proffered service. If TService is not registered as async or free-threaded, then this cast will be performed on the main thread.

Parameters

sp

IServiceProvider

The IServiceProvider.

Returns

TInterface

The requested service.

Exceptions

ArgumentNullException

sp is null

ServiceUnavailableException

There was a failure retrieving the service due to one of the following conditions:

• The service threw an exception during activation. InnerException may include details about the underlying failure.
• The associated package failed to load. InnerException may include details about the underlying failure.
• The associated package could not be found, or the package did not correctly proffer the service.
• The associated package proffered null.
• The service does not support the requested interface specified by TInterface.
• The environment has starting shutting down and the retrieval would have resulted in a package load.

Remarks

Prefer this method over an explicit cast to TInterface to avoid a blocking RPC call if the underlying service is STA-bound, which can hang if the UI thread is blocked in a Run(Func<Task>) or Join(CancellationToken)

Note the difference in behavior this method has around exceptions to its non-generic equivalent GetService(Type).

This method is safe to access from any thread.

GetService<TService,TInterface>(IServiceProvider, Boolean)

Retrieves a proffered service synchronously, specifying whether to throw an exception if it could not be retrieved.

public static TInterface? GetService<TService,TInterface> (this IServiceProvider sp, bool throwOnFailure) where TInterface : class;

static member GetService : IServiceProvider * bool -> 'Interface (requires 'Interface : null)

<Extension()>
Public Function GetService(Of TService, TInterface) (sp As IServiceProvider, throwOnFailure As Boolean) As TInterface

Type Parameters

TService

The service identity of the proffered service to retrieve.

TInterface

The interface used to interact with the proffered service. If TService is not registered as async or free-threaded, then this cast will be performed on the main thread.

Parameters

sp

IServiceProvider

The IAsyncServiceProvider.

throwOnFailure

Boolean

true to throw an exception if the service could not be retrieved; otherwise, false to return null on failure.

Returns

TInterface

The requested service or null if there was a failure and throwOnFailure is false.

Exceptions

ArgumentNullException

sp is null

ServiceUnavailableException

throwOnFailure is true and there was a failure retrieving the service due to one of the following conditions:

• The service threw an exception during activation. InnerException may include details about the underlying failure.
• The associated package failed to load. InnerException may include details about the underlying failure.
• The associated package could not be found, or the package did not correctly proffer the service.
• The associated package proffered null.
• The service does not support the requested interface specified by TInterface.
• The environment has starting shutting down and the retrieval would have resulted in a package load.

Remarks

Prefer this method over an explicit cast to TInterface to avoid a blocking RPC call if the underlying service is STA-bound, which can hang if the UI thread is blocked in a Run(Func<Task>) or Join(CancellationToken).

Note the difference in behavior this method has around exceptions to its non-generic equivalent GetService(Type).

This method is safe to access from any thread.