Colors. Part 1.

First 27 and last 7 of System.Drawing.KnownColor are “System” colors:

for (int i = 1; i <= Enum.GetValues(typeof(KnownColor)).Length; i++){

    if (i <= 27 || i >= 168){

        String str = String.Format("{0}.{1}", i, (KnownColor)i);

        System.Diagnostics.Trace.WriteLine(str);

    }

}

1.ActiveBorder 2.ActiveCaption 3.ActiveCaptionText 4.AppWorkspace 5.Control 6.ControlDark 7.ControlDarkDark 8.ControlLight 9.ControlLightLight

10.ControlText 11.Desktop 12.GrayText 13.Highlight 14.HighlightText 15.HotTrack 16.InactiveBorder 17.InactiveCaption 18.InactiveCaptionText

19.Info 20.InfoText 21.Menu 22.MenuText 23.ScrollBar 24.Window 25.WindowFrame 26.WindowText 27.Transparent

168.ButtonFace 169.ButtonHighlight 170.ButtonShadow 171.GradientActiveCaption 172.GradientInactiveCaption 173.MenuBar 174.MenuHighlight

All KnownColors with their RGB values can be shown by the following fragment:

foreach (String c in Enum.GetNames(typeof(System.Drawing.KnownColor))){

    long enumColorValue = Convert.ToInt64((KnownColor)Enum.Parse(typeof(KnownColor), c));

    String str = String.Format("{0}.{1} = {2:X}",

        enumColorValue, c,

        System.Drawing.Color.FromName(c).ToArgb());

    Trace.WriteLine(str);

}

Result looks like this:

1.ActiveBorder = FFD4D0C8

2.ActiveCaption = FFC0C0C0

3.ActiveCaptionText = FF0E1010

. . .

26.WindowText = FF000000

27.Transparent = FFFFFF

28.AliceBlue = FFF0F8FF

29.AntiqueWhite = FFFAEBD7

30.Aqua = FF00FFFF

. . .

165.WhiteSmoke = FFF5F5F5

166.Yellow = FFFFFF00

167.YellowGreen = FF9ACD32

168.ButtonFace = FFE0DFE3

169.ButtonHighlight = FFFFFFFF

. . .

172.GradientInactiveCaption = FFEEEFF7

173.MenuBar = FFE0E2EB

174.MenuHighlight = FFBBB7C7

All named-colors in KnownColors have ENUM numbers from 28 to 167.

I use LINQ to sort them by their RGB value. (will be in Part 2)
int

    numAliceBlue = (int)KnownColor.AliceBlue,

    numYellowGreen = (int)KnownColor.YellowGreen;

Dictionary<KnownColor, int> colorsRGB = new Dictionary<KnownColor, int>(numYellowGreen - numAliceBlue + 1);

for (int i = numAliceBlue; i <= numYellowGreen; i++){

    KnownColor kc = (KnownColor)i;

    colorsRGB.Add(kc, Color.FromKnownColor(kc).ToArgb());

}

var sortedColors = from clr in colorsRGB

                   orderby clr.Value descending

                   select clr;

foreach (KeyValuePair<KnownColor, int> clr in sortedColors){

    String str = String.Format("{0:X08} - {1}", clr.Value, clr.Key);

    Trace.WriteLine(str);

}