System.InvalidOperationException: The Task is not in a valid state to be started

Question

Task t = navigation.PushModalAsync(new AuthLoginPage("facebook"));
            t.Start();
            t.Wait();

How to resolve the exception : System.InvalidOperationException: The Task is not in a valid state to be started.

Answer 1

You can follow this simple usage :-

// When you wanted to start the Async call.
var t = navigation.PushModalAsync(new AuthLoginPage("facebook"));
.
.
// do your other work.
.
.
.
// when you want the result of the Task t that you have started before.
var result =await t; // task will wait here for getting result for you.

You can read more about async/await. it is good to know more about async/await as it is very powerful and easy. look Here for async/await

hope it helps you.

Answer 2

Usually when a method returns a Task, it has already started, so you don't need to explicitly start it.

If you want to wait on its result, utilize await => await t; . If you want to block on its execution, then call the Result property => t.Result .