TaskFactory.FromAsync Method (Func<AsyncCallback, Object, IAsyncResult>, Action<IAsyncResult>, Object, TaskCreationOptions)
Creates a Task that represents a pair of begin and end methods that conform to the Asynchronous Programming Model pattern.
Assemblies: mscorlib (in mscorlib.dll)
System.Threading.Tasks (in System.Threading.Tasks.dll)
public Task FromAsync( Func<AsyncCallback, Object, IAsyncResult> beginMethod, Action<IAsyncResult> endMethod, Object state, TaskCreationOptions creationOptions )
- Type: System.Func<AsyncCallback, Object, IAsyncResult>
The delegate that begins the asynchronous operation.
- Type: System.Object
An object containing data to be used by the beginMethod delegate.
The exception that is thrown when the beginMethod argument is null.
The exception that is thrown when the endMethod argument is null.
The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value.
The beginMethod delegate is started on the thread that FromAsync is running on. This method throws any exceptions thrown by the beginMethod. The TaskCreationOptions values PreferFairness, LongRunning and AttachedToParent are all mutually exclusive. In the FromAsync methods, either LongRunning or AttachedToParent by themselves will cause an ArgumentOutOfRangeException to be thrown.