How to change the standard event handler signature of asp Updatepanel? - asp.net

Question

I always used to use standard Asp.net Controls beside AjaxControlToolkit and never faced a problem. Recently I had to use Dundas Charting controls which are not standard .NET controls and I have to control a part of apage based on the report shown in Dundas.
Unfortunately Dundas Event Signature does not recognized by UpdatePanel and Iget the following error
Description:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details:
System.InvalidOperationException: The 'CommandFired' event on associated control 'chart1' for the trigger in UpdatePanel 'updatepanel1' does not match the standard event handler signature.
So I want to know that is there any possibility to change the Handler signature of updatepanel? If yes, How to do that?

Answer 1

It looks as if the CommandFiredEventArgs class does not derive from System.EventArgs which is probably the issue. Rather than try and change the signature that the UpdatePanel is expecting, I would derive a subclass from the Chart object and then add your own events, with your own EventArgs class as part of the signature. It should then be easy to hook these up to the existing Dundas events.
A very rough sample without access to VisualStudio below. This has not been compiled so please tidy it up yourself, but it outlines the general idea.
public class CustomChart : Dundas.Charting.WebControl.Chart
{
public event EventHandler<EventArgs> MyCustomEvent;
public CustomChart()
{
this.CommandFired += SomeMethod;
}
private void SomeMethod(object sender, CommandFiredEventHandler args)
{
this.OnMyCustomEvent(EventArgs.Empty);
}
protected void OnMyCustomEvent(EventArgs args)
{
if (this.MyCustomEvent != null)
{
this.MyCustomEvent(this, args);
}
}
}