Making Extension method Generic
- by Ian
In this post there's a very interesting way of updating UI threads using a static extension method.
public static void InvokeIfRequired(this Control c, Action<Control> action)
{
if(c.InvokeRequired)
{
c.Invoke(() => action(c));
}
else
{
action(c);
}
}
What I want to do, is to make a generic version, so I'm not constrained by a control. This would allow me to do the following for example (because I'm no longer constrained to just being a Control)
this.progressBar1.InvokeIfRequired(pb => pb.Value = e.Progress);
I've tried the following:
public static void InvokeIfRequired<T>(this T c, Action<T> action) where T : Control
{
if (c.InvokeRequired)
{
c.Invoke(() => action(c));
}
else
{
action(c);
}
}
But I get the following error that I'm not sure how to fix. Anyone any suggestions?
Error 5 Cannot convert lambda expression to type 'System.Delegate' because it is not a delegate type
