TaskFactory::FromAsync<TResult> Method (IAsyncResult^, Func<IAsyncResult^, TResult>^, TaskCreationOptions)
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, TaskCreationOptions creationOptions )
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.
- creationOptions
-
Type:
System.Threading.Tasks::TaskCreationOptions
The TaskCreationOptions value that controls the behavior of the created Task<TResult>.
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. |
| ArgumentOutOfRangeException | The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. For more information, see the Remarks for FromAsync |
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
