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WPF Combo Box Binding

I am trying to bind a combo box with some data. The problem is I have data in a combo box:

                            <ComboBox>
                                <ComboBoxItem>Item 1</ComboBoxItem>
                                <ComboBoxItem>Item 2</ComboBoxItem>
                                <ComboBoxItem>Item 3</ComboBoxItem>
                                <ComboBoxItem>Item 4</ComboBoxItem>
                                <ComboBoxItem>Item 5</ComboBoxItem>
                            </ComboBox>

when a form with a combo box is loaded, I have a resource loaded that has an int that I want to bind to that combo box. So if this int is 1, I want the combo box to display Item 1, etc., and when I change the item in the combo box, I want to update it accordingly.

Is there a way to link this resource to a combo box to achieve this?

Thank you in advance

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Here's a complete XAML example on how to do this:

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    Title="Window1">
    <Window.Resources>
        <sys:Int32 x:Key="TheIndex">2</sys:Int32>
    </Window.Resources>
    <ComboBox SelectedIndex="{Binding Source={StaticResource TheIndex}, Mode=OneWay}">
        <ComboBoxItem>One</ComboBoxItem>
        <ComboBoxItem>Two</ComboBoxItem>
        <ComboBoxItem>Three</ComboBoxItem>
        <ComboBoxItem>Four</ComboBoxItem>
    </ComboBox>
</Window>


Please note the following:

  • the XML namespace is sys

    declared as a mapping to the System

    CLR namespace in the mscorlib assembly
  • Binding

    on is SelectedIndex

    set to OneWay

    because it defaults to TwoWay

    , which makes no sense when binding directly to a resource
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