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TaskFactory<TResult>.FromAsync Method (IAsyncResult, Func<IAsyncResult, TResult>)

Creates a TaskFactory<TResult> that executes an end method function when a specified IAsyncResult completes.

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

public Task<TResult> FromAsync(
	IAsyncResult asyncResult,
	Func<IAsyncResult, TResult> endMethod


Type: System.IAsyncResult
The IAsyncResult whose completion should trigger the processing of the endMethod.
Type: System.Func<IAsyncResult, TResult>
The function delegate that processes the completed asyncResult.

Return Value

Type: System.Threading.Tasks.Task<TResult>
A TaskFactory<TResult> that represents the asynchronous operation.


The exception that is thrown when the asyncResult argument is null.


The exception that is thrown when the endMethod argument is null.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.