Opacity Property
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Brush.Opacity Property

Gets or sets the degree of opacity of a Brush.

Namespace:  System.Windows.Media
Assembly:  System.Windows (in System.Windows.dll)

public double Opacity { get; set; }
<brush Opacity="double"/>

Property Value

Type: System.Double
The value of the Opacity property is expressed as a value between 0 and 1.0. The default value is 1.0.

Dependency property identifier field: OpacityProperty

An Opacity value of 0 indicates that the brush is completely transparent, while a value of 1 indicates that the brush is completely opaque. A value of 0.5 indicates the brush is 50% opaque, a value of 0.725 indicates the brush is 72.5% opaque, and so on. Values less than 0 are treated as 0, while values greater than 1 are treated as 1.

The following illustrations shows a red rectangle with several different Opacity values.

Opacity = 1

Rectangle with 100 percent opacity.
Opacity = 0.7

Red rectangle.
Opacity = 0.5

Rectangle with 50 percent opacity.
Opacity = 0.2

Rectangle with 20 percent opacity.
Opacity = 0

Rectangle with 0% opacity.

An Opacity of 0 applied to any Brush is still hit testable. Only a true null Brush is not hit testable. You could however set IsHitTestVisible to false to remove any hit testing against the UIElement where the Brush is ultimately applied.


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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