Custom DispatcherTimer-based Delay for WPF applications

Extensions_WPF.cs

using System;
using System.Threading.Tasks;
using System.Windows.Threading;

namespace App;

static partial class Extensions
{
    // https://stackoverflow.com/questions/79806454/task-delay-versus-custom-dispatchertimer-based-delay-in-wpf
    public static Task Delay(this DispatcherObject source, int millisecondsDelay)
    {
        ArgumentNullException.ThrowIfNull(source);
        ArgumentOutOfRangeException.ThrowIfLessThan(millisecondsDelay, 0);
        TaskCompletionSource tcs = new();
        DispatcherTimer timer = new(DispatcherPriority.Normal, source.Dispatcher);
        timer.Interval = TimeSpan.FromMilliseconds(millisecondsDelay);
        timer.Tick += (s, e) => { timer.Stop(); tcs.SetResult(); };
        timer.Start();
        return tcs.Task;
    }
}