Silverlight 16进制颜色转Color (含透明度处理)

由于Silverlight 不能引用System.Drawing 命名空间进行 颜色转换的一些处理,故写此函数来转换

public Color HtmlToColor(string htmlColr)
 {
            int baseIndex = 1;
            byte a, r, g, b;
            a = r = g = b = 255;
            if (htmlColr.Length == 9)
            {
                a = Convert.ToByte(htmlColr.Substring(baseIndex, 2), 16);
                baseIndex += 2;
            }
            r = Convert.ToByte(htmlColr.Substring(baseIndex, 2), 16);
            g = Convert.ToByte(htmlColr.Substring(baseIndex += 2, 2), 16);
            b = Convert.ToByte(htmlColr.Substring(baseIndex += 2, 2), 16);
            return Color.FromArgb(a, r, g, b);
 }