#1,195 – Making a Window Partially Transparent

You can use an alpha value when setting a background color to make the background of a control partially transparent.  (E.g. Making a tooltip partially transparent).

You can make the background of a Window transparent, or partially transparent, by doing three things:

  • Set the Background to Transparent or use a background that is partially transparent
  • Set the AllowsTransparency property to true
  • Set the WindowStyle to None

The WindowStyle must be set to None when setting AllowsTransparency to true.

Here’s an example:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Transparent"
        Height="190" Width="268"
        Background="#D5F0F0FF"
        AllowsTransparency="True"
        WindowStyle="None">

    <StackPanel>
        <Button Content="Click Me"
                Padding="10,5" Margin="10"
                HorizontalAlignment="Center"/>
    </StackPanel>
</Window>

We now get a window that doesn’t include a border (so we can’t move it), but whose background is partially transparent.  The controls within a transparent window are opaque and all work fine.

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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