Automating the InvokeRequired code pattern

Question

I have become painfully aware of just how often one needs to write the following code pattern in event-driven GUI code, where

private void DoGUISwitch() {
           


        

Answer 1

Here's an improved/combined version of Lee's, Oliver's and Stephan's answers.

public delegate void InvokeIfRequiredDelegate(T obj)
    where T : ISynchronizeInvoke;

public static void InvokeIfRequired(this T obj, InvokeIfRequiredDelegate action)
    where T : ISynchronizeInvoke
{
    if (obj.InvokeRequired)
    {
        obj.Invoke(action, new object[] { obj });
    }
    else
    {
        action(obj);
    }
} 

The template allows for flexible and cast-less code which is much more readable while the dedicated delegate provides efficiency.

progressBar1.InvokeIfRequired(o => 
{
    o.Style = ProgressBarStyle.Marquee;
    o.MarqueeAnimationSpeed = 40;
});