WPF C＃位图资源作为ImageBrush的Imagesource

Question

我有位图资源Properties.Resources.part1

internal static System.Drawing.Bitmap part1 
{
    get 
    {
        object obj = ResourceManager.GetObject("part1", resourceCulture);
        return ((System.Drawing.Bitmap)(obj));
    }
}

如何将此资源设置为Rectangle.Fill属性？