Bind Enum to Combobox.SelectedIndex

原文:Bind Enum to Combobox.SelectedIndex

Do you mean that you want to bind a variable (not a property) to ComboBox.SelectedIndex? If so, I think that the better method to do this is bind a property to ComboBox.SelectedItem. The following example shows how to bind a property to the ComboBox.SelectedItem. If you want to have more functionality from the binding, you should have the property is a dependency property.

Code Snippet

<Window x:Class="LearningSolution.MainWindow"



xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"



xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"



xmlns:system="clr-namespace:System;assembly=mscorlib"



xmlns:local="clr-namespace:LearningSolution"



Name="TheWindow">



<Window.Resources>



<ObjectDataProvider x:Key="EnumValues"



MethodName="GetValues"



ObjectType="{x:Type system:Enum}">



<ObjectDataProvider.MethodParameters>



<x:Type TypeName="local:LevelEnum" />



</ObjectDataProvider.MethodParameters>



</ObjectDataProvider>



<DataTemplate x:Key="EnumValueTemplate">



<TextBlock Text="{Binding}"/>



</DataTemplate>



</Window.Resources>



<StackPanel>



<ComboBox ItemsSource="{Binding Source={StaticResource EnumValues}}"



ItemTemplate="{StaticResource EnumValueTemplate}"



SelectedItem="{Binding ElementName=TheWindow, Path=TheLevel, Mode=OneWayToSource}"/>



<Button Click="Button_Click">Watch</Button>



</StackPanel>



</Window>



public partial class MainWindow : Window



{



public LevelEnum TheLevel { get; set; }



private void Button_Click(object sender, RoutedEventArgs e)



{



MessageBox.Show(this.TheLevel.ToString());



}



}



public enum LevelEnum { None = 0, First = 1, Second = 2, Third = 3 }



 

For more information about binding and dependency property, you could refer to the following links.

http://msdn2.microsoft.com/en-us/library/ms753192.aspx

http://msdn2.microsoft.com/en-us/library/ms750612.aspx