FromAsync Method (Func(AsyncCallback, Object, IAsyncResult), Func(IAsyncResult, TResult), Object, TaskCreationOptions)

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

.NET Framework (current version)
 

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.

Exception Condition
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.

Universal Windows Platform
Available since 4.5
.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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