Question

Need help calling event from another class.
I have class with declared event:

     public class MxPBaseGridView : GridView
    {

        public event AddNewItemsToPopUpMenuEventHandler AddNewItemsToPopUpMenu;
          ...
    }

Another class from which i need to call event has methods and “AddNewItemsToPopUpMenuEventHandler ” delegate

    public delegate void AddNewItemsToPopUpMenuEventHandler(PopupMenuShowingEventArgs e);
    public static class GridViewUtils
{
public static void gridView_PopupMenuShowing(object sender, PopupMenuShowingEventArgs e)
    {                     
        if (e.MenuType != DevExpress.XtraGrid.Views.Grid.GridMenuType.Row)
        {
           if (menu != null)
            {               
                if (sender is MxPBaseAdvBandedGridView)
                {
                    MxPBaseAdvBandedGridView currentGrid = sender as MxPBaseAdvBandedGridView;

...

                    currentGrid.AddNewItemsToPopUpMenu();
                    if (currentGrid.AddNewItemsToPopUpMenu != null) //there i need to call event
                        currentGrid.AddNewItemsToPopUpMenu(e); // how you understand it doesn't work 
                }

so what is the right way to do the same job?

Answer 1

You can only invoke an event in the class where you have defined the event. What is common is to use a specific method to fire the event, which you have to add in the class where you define the event. In your case, in the class MxPBaseGridView. Add the following:

public void OnAddNewItemsToPopUpMenu(<eventargstype> e) {
    var addNewItemsToPopUpMenu = AddNewItemsToPopUpMenu;
    if (addNewItemsToPopUpMenu != null)
        addNewItemsToPopUpMenu(this, e);
}

Note: I’m not sure what the eventargs-type is, so I’ve left it open.

Then you can call this method from your static method.

Note: normally I define the On… methods as private, if necessary as protected. In this case I’ve defined it public since you need to call it from outside your class.