using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace SystemColorPicker
{
    public class ColorPicker
    {
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct CHOOSECOLOR
        {
            public int lStructSize;
            public IntPtr hwndOwner;
            public IntPtr hInstance;
            public uint rgbResult;
            public IntPtr lpCustColors;
            public uint flags;
            public IntPtr lCustData;
            public IntPtr lpfnHook;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string lpTemplateName;
        }

        [DllImport("comdlg32.dll", CharSet = CharSet.Auto)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool ChooseColor(ref CHOOSECOLOR lpcc);

        public static bool GetColor(ref uint col)
        {
            CHOOSECOLOR CS = new CHOOSECOLOR();
            int structSize = Marshal.SizeOf(CS);
            CS.lStructSize = structSize;
            CS.hwndOwner = IntPtr.Zero;
            CS.flags = 0x1 | 0x2;
            CS.lpCustColors = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(uint)) * 16);
            CS.rgbResult = col;
            CS.hInstance = IntPtr.Zero;

            bool result = ChooseColor(ref CS);
            if (!result)
                return false;

            col = CS.rgbResult;

            Marshal.FreeCoTaskMem(CS.lpCustColors);
            return true;
        }
    }
}

וצורת השימוש בו היא

 uint color = 0;
 ColorPicker.GetColor(ref color);

האמת היא שאני מבין רק חלק מהקוד אשמח לקבל הצעות לשיפור ממי שבאמת מבין מה הולך פה