I am trying to reference a public method in an MDI child form instance FROM another MDI child form.
What I am attempting to do is the following:
Main application is an MDI window. the MDI window opens a new form (form1) as an MDI child. In form1 I have a recordset of companies. The user can then select an option to update/add/delete a record to the database of companies. This opens form2 as another MDI child of the main window.
When form2 is closed, I want to invoke an update method in form1 which will reload the dataset from the server. there are multiple copies of form1 that can be open, so I want to be able to invoke the method in each instance.
Can anyone tell me how I can reference a non-static method in an instance of form1 from form2?
Thanks...
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Actually, there are no errors recieved because the application will not compile with the reference to the UpdateDB() method. The Message VB.NET gives me is:
'System.Windows.Forms.Form
It appears that because the foreach loop is referencing "Form f" that it is trying to use the default definition of Form and not reference the actual subforms in MDIChildren.
Any ideas?
I also thought that maybe I could cycle through all forms of a specific type, therefore eliminating the reference to the general "Form" which .NET was trying to reference. However, when I do this, I DO get a casting error:
foreach (Form1 f in this.MdiParent.MdiChildren
{
try
{
f.UpdateDB();
}
catch(Exception ex)
{
MessageBox.Show(ex.ToStrin
}
}
From which I get an invalid cast exception (because not all forms in MdiChildren are Form1...there are also many other forms open).
Business Accounts
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by: gerry99Posted on 2005-02-04 at 14:20:58ID: 13230528
I think you will need to go through your MDI parent form. In your MDI parent create a collection, that you can add each of your MDI child forms to. When a child is closing, override the Close method, and call your method on your Parent class to notify each MDI child in that collection that needs to know that the other view is closed. (And remove the view that is closing from that collection.)
BTW, what I find most frustrating about .NET forms, is the way they assume that you want to use keyboard shortcuts in whatever way has been pre-defined. I have a form containing a panel and a listbox. When the listbox is not added, I can use arrow keys to move a line across the panel, once the list box has been added it captures *all* key stroke events.