wpf绑定到另一个控件属性

Question

so i have this usercontrol :

<UserControl x:Class="Client.SpectrumSpace"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:my="clr-namespace:Client" 
             mc:Ignorable="d" d:DesignHeight="150" d:DesignWidth="350">
    <Canvas>
        <Rectangle Width="350" Height="150" Fill="Transparent" Stroke="White" StrokeThickness="1">
            <Rectangle.ContextMenu>
                <ContextMenu Name="contextMenu">
                    <MenuItem Name="ctxItem1" Header="AntennaName" 
                              IsEnabled="{Binding MainWindow.availeableAntennas[0]}"/>
                </ContextMenu>
            </Rectangle.ContextMenu>
        </Rectangle>
    </Canvas>
</UserControl>

and as you can see im trying to bind the MainWindow.availableAntennas[0] property to the MenuItem.IsEnabled property

this is how i declared the array on MainWindow class:

public  bool[]      availableAntennas   = new bool[9];

my problem is that the IsEnabled property is always true and yes i double checked the availeableAntennas[0] is false, so what am i doing wrong here?

Answer 1

You should use "RelativeSource" of the binding expression.

Cheers

Answer 2

To me, it looks like it could be a few things or all of them:

• You can't bind to a field it must be a property - public bool[] availableAntennas = new bool[9] ,
• A typo - availeableAntennas vs. availableAntennas ,
• The datacontext must be set(it's not apparent from your posting),
• The class you are bound to must implement INotifyPropertyChanged.