Question

I have the following code:
XAML:

<UserControl x:Class="RBSoft.WPF.RedConsoleViewer"
             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" 
             mc:Ignorable="d" 
             d:DesignHeight="355" d:DesignWidth="691" Name="ConsoleUI_Control" KeyDown="ConsoleUI_Control_KeyDown">
    <Grid Name="_Layout">
        <Rectangle Name="BackgroundLayout">
            <!--...-->
        </Rectangle>
    </Grid>
</UserControl>

Code:

public Rectangle IBackground
{
    get { return this.BackgroundLayout; }
    set { this.BackgroundLayout = value; }
}

What I’m tying to do is edit the rectangle (BackgroundLayout) from the XAML editor like so:

<Window x:Class="LifeEnvironment.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="1064" Width="910"
        xmlns:my="clr-namespace:RBSoft.WPF;assembly=RBSoft.WPF"
        WindowStyle="None"
        WindowState="Maximized"
        WindowStartupLocation="CenterScreen">
    <Grid>
        <my:userControlTest>
            <my:userControlTest.IBackground>
                <Background ...>
            </my:userControlTest.IBackground>
        </my:userControlTest>
    </Grid>
</Window>

But I have no access to this, what I need to do?

Answer 1

The correct way to do it, is by wrapping up the Rectangle with an User Control, like this:

<UserControl x:Class="RBSoft.WPF.RedConsoleViewer" ...>
    <Grid Name="_Layout">
        <UserControl Name="BackgroundLayout">
            <Rectangle .../>
        </UserControl>
    </Grid>
</UserControl>

and then, change the Content property instead the object itself, so you don’t lose the reference(BackgroundLayout):

public Rectangle IBackground
{
    get { return (Rectangle)this.BackgroundLayout.Content; }
    set { this.BackgroundLayout.Content = value; }
}

and finally, it will work:

<my:userControlTest>
    <my:userControlTest.IBackground>
        <Background ...>
    </my:userControlTest.IBackground>
</my:userControlTest>