C# stop execution until an event raises

Question

I need to stop execution of the program until user clicks a button. I\'m doing a discrete event simulation and the goal now is to provide simple graphics illustrating the si

Answer 1

You can create a method that will return a Task that will be completed when a particular button is next clicked, which it can accomplish through the use of a TaskCompletionSource object. You can then await that task to continue executing your method when a particular button is clicked:

public static Task WhenClicked(this Button button)
{
    var tcs = new TaskCompletionSource<bool>();
    EventHandler handler = null;
    handler = (s, args) =>
    {
        tcs.TrySetResult(true);
        button.Click -= handler;
    };
    button.Click += handler;
    return tcs.Task;
}

This enables you to write:

DoSomething();
await button1.WhenClicked();
DoSomethingElse();