Best way to create a “run-once” time delayed function in C#

I don’t know which version of C# you are using. But I think you could accomplish this by using the Task library. It would then look something like that.

public class PauseAndExecuter
{
    public async Task Execute(Action action, int timeoutInMilliseconds)
    {
        await Task.Delay(timeoutInMilliseconds);
        action();
    }
}