Changing User Control Content

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C#

case "Maintenance":
                   switch (DrillDown.Header.ToString())
                   {
                       case "Security":
                           frmSecurity userControl = new frmSecurity();
                           currentContent.Content = userControl;
                           currentContent.Visibility = Visibility.Visible;
                           break;
                       case "Imports/Exports":
                           frmImports userControl2 = new frmImports();
                           currentContent.Content = userControl2;
                           currentContent.Visibility = Visibility.Visible;
                           break;
                       case "Order":
                           frmOrder userControl3 = new frmOrder();
                           currentContent.Content = userControl3;
                           currentContent.Visibility = Visibility.Visible;
                           break;
                   }
                   break;

Above is some code from my project, Maintenance is the menu header and the options below it are ones the user can select to open up different user controls that will appear on my main form. The user selects an option and it calls a usercontrol as the new content of my embedded user control of the calling window.

The problem is, my Imports / Exports UserControl, actually needs to call another userControl from within it. How do I reference currentContent (the userControl that I am using to host everything on my main form) from UserControl2's C# code, so that I can change the content. I know this is a scope issue, but can't seem to come up with a solution. If I am unclear with the description of my problem, please ask questions. Thanks in advance!

Posted 4-Feb-13 9:43am

Gerenatian

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db7uk · Accepted Answer · 2013-02-04T10:00:00

Are you using MVVM?

There are a couple of things you could do using MVVM or not.

1) Use an event aggregator (Prism), Mediator (Cinch) or messenger (mvvm light I think). or use a singleton to provide a means of communication between two or more user controls. Basically these all relate to a publish and subscribe pattern. This is really the best way to go about controls communicating with each other.

2) Failing that, create a method, event or function in App.xaml. because this is a global class and accessible to most of your application, you can / could use that. Personally I would not recommend this but it is a solution to a problem in the short term.

some links:

MVVM Mediator Pattern[^]
http://joshsmithonwpf.wordpress.com/2009/04/06/a-mediator-prototype-for-wpf-apps/[^]
Prism EventAggregator Sample[^]