Once again, while browsing StackOverflow.com, I came across a question from a user who needed to fix their ComboBox Binding. The user in question was Binding XML data in Key/Value pairs to the combo box, displaying the Key and wanted to retrieve the Value.
This was achieved using the following example;
My XML Test Data was saved as XMLFile1.xml;
<?xml version="1.0" encoding="utf-8"?>
<Colours>
<Colour ID="1" Name="None" />
<Colour ID="2" Name="Red" />
<Colour ID="3" Name="White" />
</Colours>
My XAML was;
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="74" Width="150">
<Window.Resources>
<XmlDataProvider x:Key="ColourData" Source="/XMLFile1.xml" XPath="Colours" />
</Window.Resources>
<Grid>
<ComboBox x:Name="cmbColour" HorizontalAlignment="Left" Margin="10,10,0,0"
VerticalAlignment="Top" Width="120" DisplayMemberPath="@ID"
ItemsSource="{Binding Source={StaticResource ColourData}, XPath=./Colour}" SelectedValuePath="@Name"
SelectedValue="{Binding SelectedColourValue}" />
</Grid>
</Window>
And finally my ViewModel was;
Imports System.ComponentModel
Imports System.Xml
Class MainWindow : Implements INotifyPropertyChanged
Private _SelectedColourValue As String
Public Property SelectedColourValue As String
Get
Return _SelectedColourValue
End Get
Set(value As String)
If value.Equals(_SelectedColourValue) = False Then
_SelectedColourValue = value
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("SelectedColourValue"))
End If
End Set
End Property
Public Event PropertyChanged(sender As Object, e As PropertyChangedEventArgs) Implements INotifyPropertyChanged.PropertyChanged
Public Sub New()
' This call is required by the designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
me.DataContext = Me
End Sub
End Class
This successfully displayed the ID property in the ComboBox, and when selected the “SelectedColourValue” Property held the Value.
