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Imaging.CreateBitmapSourceFromHIcon Method

.NET Framework 4

Returns a managed BitmapSource, based on the provided pointer to an unmanaged icon image.

Namespace:  System.Windows.Interop
Assembly:  PresentationCore (in PresentationCore.dll)
C#
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public static BitmapSource CreateBitmapSourceFromHIcon(
	IntPtr icon,
	Int32Rect sourceRect,
	BitmapSizeOptions sizeOptions
)

Parameters

icon
Type: System.IntPtr
A pointer to the unmanaged icon source.
sourceRect
Type: System.Windows.Int32Rect
The size of the source image.
sizeOptions
Type: System.Windows.Media.Imaging.BitmapSizeOptions
A value of the enumeration that specifies how to handle conversions.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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No, you don't need to work out the icon size yourself.
Getting the size of an HICON is pretty annoying, but it turns out to be unnecessary. The parameters here work like Imaging.CreateBitmapSourceFromHBitmap.

You pass Int32Rect.Empty as 'sourceRect' and BitmapSizeOptions.FromEmptyOptions() for 'sizeOptions'. This will convert the whole icon, however big it happens to be, into a BitmapSource. I hope this is the intended behavior, and not a bug, because it's crazy handy.
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