When targeting .NET 4.5 you can use Task.FromResult
:
public static Task<TResult> FromResult<TResult>(TResult result);
To create a failed task, use Task.FromException
:
public static Task FromException(Exception exception);
public static Task<TResult> FromException<TResult>(Exception exception);
.NET 4.6 adds Task.CompletedTask
if you need a non generic Task
.
public static Task CompletedTask { get; }
Workarounds for older versions of .NET:
-
When targeting .NET 4.0 with Async Targetting Pack (or AsyncCTP) you can use
TaskEx.FromResult
instead. -
To get non-generic
Task
prior to .NET 4.6, you can use the fact thatTask<T>
derives fromTask
and just callTask.FromResult<object>(null)
orTask.FromResult(0)
.