Return Task<bool> instantly

Question

I have a list of tasks, which i'd like to wait for. I'm waiting like

    await TaskEx.WhenAll(MyViewModel.GetListOfTasks().ToArray()); 

MyViewModel.GetListOfTasks() returns List of Task:

    var tasksList = new List<Task>();     foreach (var item in Items)     {                         tasksList.Add(item.MyTask());     } 

Now, i'd like to return dummy task, which would be done immediately. However, TaskEx.WhenAll would wait it forever:

    public Task<bool> MyTask()     {         return new Task<bool>(() => false);     } 

How can i return Task, which would be finished instantly?

Answer 1

in .NET 4.5 you can use FromResult to immediately return a result for your task.

public Task<bool> MyTask() {     return TaskEx.FromResult(false); } 

http://msdn.microsoft.com/en-us/library/hh228607%28v=vs.110%29.aspx

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For Windows Phone 8.1 and higher, the API has been merged to be consistent with other platforms:

public Task<bool> MyTask() {     return Task.FromResult(false); }