C# RGB與16進制顏色轉換方法

http://www.cnblogs.com/goldarch/archive/2010/08/16/1801053.html

#region [顏色：16進制轉成RGB]
        /// <summary>
        /// [顏色：16進制轉成RGB]
        /// </summary>
        /// <param name="strColor">設置16進制顏色 [返回RGB]</param>
        /// <returns></returns>
        public static System.Drawing.Color colorHx16toRGB(string strHxColor)
        {
            try
            {
                if (strHxColor.Length == 0)
                {//如果為空
                    return System.Drawing.Color.FromArgb(0, 0, 0);//設為黑色
                }
                else
                {//轉換顏色
                    return System.Drawing.Color.FromArgb(System.Int32.Parse(strHxColor.Substring(1, 2), System.Globalization.NumberStyles.AllowHexSpecifier), System.Int32.Parse(strHxColor.Substring(3, 2), 　　　　　　　　　　System.Globalization.NumberStyles.AllowHexSpecifier), System.Int32.Parse(strHxColor.Substring(5, 2), System.Globalization.NumberStyles.AllowHexSpecifier));
                }
            }
            catch
            {//設為黑色
                return System.Drawing.Color.FromArgb(0, 0, 0);
            }
        }
        #endregion

 

#region [顏色：RGB轉成16進制]
        /// <summary>
        /// [顏色：RGB轉成16進制]
        /// </summary>
        /// <param name="R">紅 int</param>
        /// <param name="G">綠 int</param>
        /// <param name="B">藍 int</param>
        /// <returns></returns>
        public static string colorRGBtoHx16(int R, int G, int B)
        {
            return System.Drawing.ColorTranslator.ToHtml(System.Drawing.Color.FromArgb(R, G, B));
        }
#endregion

 

又：

 

　　　private string ToHexColor(Color color)
        {
            string R = Convert.ToString(color.R, 16);
            if (R == "0")
                R = "00";
            string G = Convert.ToString(color.G, 16);
            if (G == "0")
                G = "00";
            string B = Convert.ToString(color.B, 16);
            if (B == "0")
                B = "00";
            string HexColor = "#" + R + G + B;
            return HexColor;
        }

 

    public string ForeColor

    {

        set

        {

             //value = #ab364f

            int r = Convert.ToInt32("0x" + value.Substring(1, 2),16);

            int g = Convert.ToInt32("0x" + value.Substring(3, 2),16);

            int b = Convert.ToInt32("0x" + value.Substring(5, 2),16);

            txtUrl.ForeColor = System.Drawing.Color.FromArgb(r,g,b);

        }

 }