Differences

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--- swdev:dotnet:wpf:user_controls_and_intercommunication [2010/10/06 12:21]
smayr
+++ swdev:dotnet:wpf:user_controls_and_intercommunication [2011/05/25 09:48] (current)
smayr
@@ Line 2: / Line 2: @@
 For applications that are composed of multiple user controls, there needs to be coordination and communication between them.  For example, an application's ''MainWindow.xaml'':
+<code xml>
+<Window x:Class="InterUsrCtrlComm.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:local="clr-namespace:InterUsrCtrlComm"
+        Title="Inter User Control Communication" Height="350" Width="525">
+    <Grid>
+        <local:ucContent x:Name="content1"/>
+        <local:ucPopupMnu x:Name="popupmnu1"/>
+    </Grid>
+</Window>
+</code>
+Attach menu event programmatically (in C#):
+<code csharp>
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+namespace InterUsrCtrlComm
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+            // Attach menu event handler
+            popupmnu1.MenuItemSelected += new RoutedEventHandler(ucPopupMnu_MenuItemSelected);
+        }
+        /// <summary>
+        /// Event handler for Menu Item Selection in Popup menu.
+        /// </summary>
+        /// <param name="sender"></param>
+        /// <param name="e"></param>
+        private void ucPopupMnu_MenuItemSelected(object sender, RoutedEventArgs e)
+        {
+            // Get menu selection
+            ListBoxItem selection = popupmnu1.SelectedItem;
+            // Take action based on the menu selection
+            content1.SelectedTabItem = selection.Content.ToString();
+        }
+   }
+}
+</code>
+If the event is defined with XAML (''MainWindows.xaml''), then:
 <code xml>
 <Window x:Class="InterUsrCtrlComm.MainWindow"
@@ Line 15: / Line 77: @@
 </code>
-''MainWindows.xaml.cs'':
+The code-behind looks like (''MainWindows.xaml.cs''):
 <code csharp>
 using System;
@@ Line 41: / Line 103: @@
         {
             InitializeComponent();
+            // This next line should not be present, since XAML will add it automatically in InitializeComponent()
+            //popupmnu1.MenuItemSelected += new RoutedEventHandler(ucPopupMnu_MenuItemSelected);
         }
@@ Line 254: / Line 319: @@
 == Resources ==
   * [[http://www.tanguay.info/web/index.php?pg=howtos&id=4|How to create WPF user controls with parameters]]
+  * [[http://msdn.microsoft.com/en-us/library/ms742806.aspx|MSDN: Router Events Overview]]