TaskFactory::FromAsync<TResult> Method (IAsyncResult^, Func<IAsyncResult^, TResult>^)
Creates a Task<TResult> that executes an end method function when a specified IAsyncResult completes.
Assembly: mscorlib (in mscorlib.dll)
public: generic<typename TResult> Task<TResult>^ FromAsync( IAsyncResult^ asyncResult, Func<IAsyncResult^, TResult>^ endMethod )
Parameters
- asyncResult
-
Type:
System::IAsyncResult^
The IAsyncResult whose completion should trigger the processing of the endMethod.
- endMethod
-
Type:
System::Func<IAsyncResult^, TResult>^
The function delegate that processes the completed asyncResult.
Return Value
Type: System.Threading.Tasks::Task<TResult>^A Task<TResult> that represents the asynchronous operation.
Type Parameters
- TResult
The type of the result available through the Task<TResult>.
| Exception | Condition |
|---|---|
| ArgumentNullException | The exception that is thrown when the asyncResult argument is null. -or- The exception that is thrown when the endMethod argument is null. |
Tip |
|---|
The FromAsync overloads that take an asyncResult parameter are not as efficient as the overloads that take a beginMethod parameter. If performance is an issue, use the overloads that provide the beginMethod/endMethod pattern. |
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
