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Resize a Window in Avalonia

Wed, 05 Aug 2026 00:00:00 +0000

Set the Size in XAML
#

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="YourApp.MainWindow"
        Width="800" Height="600"><!-- Set the window size here -->

    <TextBlock Text="The window has been resized."
               HorizontalAlignment="Center"
               VerticalAlignment="Center"/>
</Window>

Use the Width property to set the window’s width and the Height property to set its height.

Change the Window Background Color in Avalonia

Wed, 08 Jul 2026 00:00:00 +0000

Set the Background Color in XAML
#

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://microsoft.com"
        x:Class="YourApp.MainWindow"
        Title="YourApp"
        Width="400" Height="300"
        Background="Black"> <!-- Set the background color here -->
        
    <TextBlock Text="The background color has been changed." HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Window>

Set the Background property of the Window to a color name or a hexadecimal color code to change the window’s background color.

Change the Window Title in Avalonia

Wed, 08 Jul 2026 00:00:00 +0000

Set the Title in XAML
#

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="YourApp.MainWindow"
        Width="400" Height="300"
        Title="サンプルアプリ"><!-- Set the window title here -->

    <TextBlock Text="The window title has been changed." HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Window>

Set the TitleW property to the text you want to display in the window’s title bar.