根据颜色获取相应的字符串形式的十六进制值

//color为传入的颜色值，返回值不包含“0x”

        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;
        }