Create a completed Task

Question

I want to create a completed Task (not Task). Is there something built into .NET to do this?

A related question: Create a complete

Answer 1

Task is implicitly convertable to Task, so just get a completed Task (with any T and any value) and use that. You can use something like this to hide the fact that an actual result is there, somewhere.

private static Task completedTask = Task.FromResult(false);
public static Task CompletedTask()
{
    return completedTask;
}

Note that since we aren't exposing the result, and the task is always completed, we can cache a single task and reuse it.

If you're using .NET 4.0 and don't have FromResult then you can create your own using TaskCompletionSource:

public static Task FromResult(T value)
{
    var tcs = new TaskCompletionSource();
    tcs.SetResult(value);
    return tcs.Task;
}