How to use the .NET Timer class to trigger an event at a specific time?

Question

I would like to have an event triggered in my app which runs continuously during the day at a certain time, say at 4:00pm. I thought about running the timer every second and

Answer 1

Starting with .NET 4.5 there's a really clean solution:

public async void ScheduleAction(Action action, DateTime ExecutionTime)
{
    await Task.Delay((int)ExecutionTime.Subtract(DateTime.Now).TotalMilliseconds);
    action();
}

Here's a solution without async/await:

public void Execute(Action action, DateTime ExecutionTime)
{
    Task WaitTask = Task.Delay((int)ExecutionTime.Subtract(DateTime.Now).TotalMilliseconds);
    WaitTask.ContinueWith(_ => action);
    WaitTask.Start();
}

It should be noted that this only works for about 24 days out because of int32 max value, which is plenty for your case, but worth noting.