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

July 28, 2014

Creates a task 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(
	Func<AsyncCallback, Object, IAsyncResult> beginMethod,
	Func<IAsyncResult, TResult> endMethod,
	Object state,
	TaskCreationOptions creationOptions
)

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.
creationOptions
Type: System.Threading.Tasks.TaskCreationOptions
One of the enumeration values that controls the behavior of the created task.

Return Value

Type: System.Threading.Tasks.Task<TResult>
The created Task<TResult> that represents the asynchronous operation.

ExceptionCondition
ArgumentNullException

The beginMethod argument is null.

-or-

The endMethod argument is null.

ArgumentOutOfRangeException

The creationOptions argument specifies an invalid value.

This method throws any exceptions thrown by the beginMethod. Exceptions for endmethod are thrown when waiting on the returned task.

Windows Phone OS

Supported in: 8.1, 8.0

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