Invoke Events that were declated in a super class

Aaron Edwards · January 1st, 2008, 07:31 PM

Hi,

I have a thin class which inherits from UserControl which only adds an event, as follows:

Code:

public class DynamicUserControl :UserControl
{
    public event EventHandler dynamicControlEvent;

}

Then I have a couple of user controls that inherit from that, i.e.

Code:

public partial class NewPageControl : DynamicUserControl
{
    protected void btnNewPageSubmit_Click(object sender, EventArgs e)
    {
        // package up the event and pass it on to the container
        if ( dynamicControlEvent != null )
            dynamicControlEvent(this, null);
    }
}

Trouble is, I get a compile error on the 2 lines at the bottom that attempt to fire the event that was declared in the superclass. Any idea why this is or how to get around it? Thanks.

Aaron

planoie · January 2nd, 2008, 03:59 PM

And the error was??

A better way of doing this is to encapsulate the calling of the event in the super class:

public class DynamicUserControl :UserControl
{
    public event EventHandler dynamicControlEvent;

    protected void DoDynamicControlEvent(EventArgs e){
        // package up the event and pass it on to the container
        if ( dynamicControlEvent != null )
            dynamicControlEvent(this, null);
    }
}

Then call the protected method from the sub classes. This also centralizes the event handler state check so each subclass needn't perform it individually.

-Peter