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Window.AllowsTransparency Property

Gets or sets a value that indicates whether a window's client area supports transparency. This is a dependency property.

Namespace:  System.Windows
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public bool AllowsTransparency { get; set; }
<object AllowsTransparency="bool" .../>

Property Value

Type: System.Boolean
true if the window supports transparency; otherwise, false.

Identifier field

AllowsTransparencyProperty

Metadata properties set to true

None

ExceptionCondition
InvalidOperationException

AllowsTransparency is changed after a window has been shown.

InvalidOperationException

A window that has a WindowStyle value of anything other than None.

When the Background property of a window is set to a transparent color, using Transparent for example, the window remains opaque. This means that the desktop and any running applications "beneath" the window cannot be seen. To enable this type of transparency, AllowsTransparency must be set to true.

AllowsTransparency exists to facilitate the creation of non-rectangular windows, and, consequently, when AllowsTransparency is set to true, a window's WindowStyle property must be set to None.

For an example that demonstrates how to create a non-rectangular window using the AllowsTransparency property, see Non-Rectangular Windows Sample.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0

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