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Window.AllowsTransparency Property

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

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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