.NET: Best way to execute a lambda on UI thread after a delay?

Question

I had a situation come up that required running a lambda expression on the UI thread after a delay. I thought of several ways to do this and finally settled on this approach

Answer 1

I think the simplest way is using System.Windows.Forms.Timer, if lambda isnt some random function.

this._timer.Interval = 1000;
this._timer.Tick += (s, e) => this.textBlock.Text = "Done";

If labda has no need to be executed in the loop, add this;

this.timer1.Tick += (s, e) => this.timer1.Stop();

And call

this.timer1.Start();

where it needed.

Another way is using Invoke methodes.

delegate void FooHandler();

private void button1_Click(object sender, EventArgs e)
        {

            FooHandler handle = () =>  Thread.Sleep(1000); 
            handle.BeginInvoke(result => { ((FooHandler)((AsyncResult)result).AsyncDelegate).EndInvoke(result); this.textBox1.Invoke((FooHandler)(() => this.textBox1.Text = "Done")); }, null);
        }

Control.Invoke guarantees that delegate would be executed in the UI thread (where parent window main descriptor exists)

Maybe exists the better variant.