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

 

Creates a Task<TResult> that represents a pair of begin and end methods that conform to the Asynchronous Programming Model pattern.

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

public Task<TResult> FromAsync<TResult>(
	Func<AsyncCallback, object, IAsyncResult> beginMethod,
	Func<IAsyncResult, TResult> endMethod,
	object state
)

Parameters

beginMethod
Type: System.Func<AsyncCallback, Object, IAsyncResult>

The delegate that begins the asynchronous operation.

endMethod
Type: System.Func<IAsyncResult, TResult>

The delegate that ends the asynchronous operation.

state
Type: System.Object

An object containing data to be used by the beginMethod delegate.

Return Value

Type: System.Threading.Tasks.Task<TResult>

The created 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 beginMethod argument is null.

-or-

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

This method throws any exceptions thrown by the beginMethod.

Universal Windows Platform
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
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