This package contains useful extensions for the WPF Window for .NET Framework and .NET 6.0+.

Extensions are provided as attached properties, accessible as winex:WindowEx.* via XAML:

You can download the Demo app to see these properties in action.

You can attach a drop shadow to a window without affecting the window template or content. The drop shadow is:

• Completely customizable (color, amount of blur, opacity, offset, corner radius, etc.)
• Transparent to mouse clicks (just like any standard window shadow)
• Does not affect the actual size of the host window
• Respects the "Show shadows under windows" option in Performance Options in Windows settings
• Style/ResourceDictionary-friendly and animatable

Before using this property, be sure to remove the default window shadow by setting WindowStyle to None, as well as any of the following:

• ResizeMode to NoResize
• AllowsTransparency to True
• WindowChrome.GlassFrameThickness to 0

Here's a minimal example:

<Window x:Class="MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:winex="https://github.com/yariker/WindowExtras.Wpf"
        Width="300" Height="200"
        ResizeMode="NoResize"
        WindowStartupLocation="CenterScreen"
        WindowStyle="None">
    
    <!-- Notice the new attached property below. -->
    <winex:WindowEx.WindowShadow>
        <winex:WindowShadow OffsetY="15" Opacity="0.3" Radius="30" />
    </winex:WindowEx.WindowShadow>

    <Button Width="100" Height="32" Click="CloseClick" Content="Close">
        <x:Code><![CDATA[void CloseClick(object sender, EventArgs e) => Close();]]></x:Code>
    </Button>

</Window>