Gets or sets the sRGB alpha channel value of the color.
Assembly: System.Runtime.WindowsRuntime (in System.Runtime.WindowsRuntime.dll)
The alpha channel of a Color structure determines the amount of transparency the Color has. An alpha value of 255 indicates the Color is completely opaque and a value of 0 indicates the color is completely transparent.
You can set this value in XAML, but only as part of the attribute syntax for properties that take a Color, or as initialization text of a Color object element. See XAML sections and Remarks sections of Color.