C# - ARGB-Farben

using System;
using System.Windows.Media;

namespace ClassLibrary1
{
    public class ARGBColor
    {
        public ARGBColor(string Hexadecimal)//#AARRGGBB
        {
            hexstring = Hexadecimal;
            char[] asChar = Hexadecimal.ToCharArray();
            string AA = Convert.ToString(asChar[1]) + Convert.ToString(asChar[2]);
            string RR = Convert.ToString(asChar[3]) + Convert.ToString(asChar[4]);
            string GG = Convert.ToString(asChar[5]) + Convert.ToString(asChar[6]);
            string BB = Convert.ToString(asChar[7]) + Convert.ToString(asChar[8]);
            a = Byte.Parse(AA, System.Globalization.NumberStyles.HexNumber);
            r = Byte.Parse(RR, System.Globalization.NumberStyles.HexNumber);
            g = Byte.Parse(GG, System.Globalization.NumberStyles.HexNumber);
            b = Byte.Parse(BB, System.Globalization.NumberStyles.HexNumber);
        }

        public ARGBColor(byte alpha, byte red, byte green, byte blue)
        {
            a = alpha;
            r = red;
            g = green;
            b = blue;
            hexstring = "#" + Convert.ToString(A, 16).PadLeft(2, '0') + Convert.ToString(R, 16).PadLeft(2, '0') + Convert.ToString(G, 16).PadLeft(2, '0') + Convert.ToString(B, 16).PadLeft(2, '0');
        }

        private string hexstring;
        public string Hexstring
        {
            get { return hexstring; }
            set
            {
                hexstring = value;
                char[] asChar = hexstring.ToCharArray();
                string AA = Convert.ToString(asChar[1]) + Convert.ToString(asChar[2]);
                string RR = Convert.ToString(asChar[3]) + Convert.ToString(asChar[4]);
                string GG = Convert.ToString(asChar[5]) + Convert.ToString(asChar[6]);
                string BB = Convert.ToString(asChar[7]) + Convert.ToString(asChar[8]);
                a = Byte.Parse(AA, System.Globalization.NumberStyles.HexNumber);
                r = Byte.Parse(RR, System.Globalization.NumberStyles.HexNumber);
                g = Byte.Parse(GG, System.Globalization.NumberStyles.HexNumber);
                b = Byte.Parse(BB, System.Globalization.NumberStyles.HexNumber);
            }
        }

        private byte a;
        public byte A
        {
            get { return a; }
            set { a = value; Hexstring = "#" + Convert.ToString(a, 16).PadLeft(2, '0') + Convert.ToString(r, 16).PadLeft(2, '0') + Convert.ToString(g, 16).PadLeft(2, '0') + Convert.ToString(b, 16).PadLeft(2, '0'); }
        }
        private byte r;
        public byte R
        {
            get { return r; }
            set { r = value; Hexstring = "#" + Convert.ToString(a, 16).PadLeft(2, '0') + Convert.ToString(r, 16).PadLeft(2, '0') + Convert.ToString(g, 16).PadLeft(2, '0') + Convert.ToString(b, 16).PadLeft(2, '0'); }
        }
        private byte b;
        public byte B
        {
            get { return b; }
            set { b = value; Hexstring = "#" + Convert.ToString(a, 16).PadLeft(2, '0') + Convert.ToString(r, 16).PadLeft(2, '0') + Convert.ToString(g, 16).PadLeft(2, '0') + Convert.ToString(b, 16).PadLeft(2, '0'); }
        }
        private byte g;
        public byte G
        {
            get { return g; }
            set { g = value; Hexstring = "#" + Convert.ToString(a, 16).PadLeft(2, '0') + Convert.ToString(r, 16).PadLeft(2, '0') + Convert.ToString(g, 16).PadLeft(2, '0') + Convert.ToString(b, 16).PadLeft(2, '0'); }
        }
    }
}