CODEWITHSUNDEEP
c#events
k5f
k5f

Reputation: 155

C# stop execution until an event raises

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 situation. When the simulation reaches an event worth showing, a method which draws the situation is called. I need the method not to jump back to the simulation core until the user clicks the button (only to be invoked again when an interesting point is reached).

Upvotes: 2

Views: 2076

Answers (1)

Servy
Servy

Reputation: 203847

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();

Upvotes: 6

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