Convert System Drawing Color to RGB and Hex Value

Question

Using C  I was trying to develop the following two  The way I am doing it may have some problem and need your kind advice  In addition  I dont know whether there is any existing method to do the same   private static String HexConverter System Drawing Color c        String rtn   String Empty      try               rtn         c R ToString  X2     c G ToString  X2     c B ToString  X2              catch  Exception ex                  doing nothing            return rtn     private static String RGBConverter System Drawing Color c        String rtn   String Empty      try               rtn    RGB     c R ToString           c G ToString           c B ToString                    catch  Exception ex                  doing nothing            return rtn      Thanks

User · Answer

I found an extension method that works quite well

public static string ToHex(this Color color)
{
    return String.Format("#{0}{1}{2}{3}"
        , color.A.ToString("X").Length == 1 ? String.Format("0{0}", color.A.ToString("X")) : color.A.ToString("X")
        , color.R.ToString("X").Length == 1 ? String.Format("0{0}", color.R.ToString("X")) : color.R.ToString("X")
        , color.G.ToString("X").Length == 1 ? String.Format("0{0}", color.G.ToString("X")) : color.G.ToString("X")
        , color.B.ToString("X").Length == 1 ? String.Format("0{0}", color.B.ToString("X")) : color.B.ToString("X"));
}

Ref: https://social.msdn.microsoft.com/Forums/en-US/4c77ba6c-6659-4a46-920a-7261dd4a15d0/how-to-convert-rgba-value-into-its-equivalent-hex-code?forum=winappswithcsharp

User · Answer

If you can use C 6 or higher  you can benefit from Interpolated Strings and rewrite  Ari Roth s solution like this   C  6    public static class ColorConverterExtensions       public static string ToHexString this Color c    gt      c R X2  c G X2  c B X2         public static string ToRgbString this Color c    gt    RGB  c R    c G    c B         Also    I add the keyword this to use them as extensions methods  We can use the type keyword string instead of the class name  We can use lambda syntax  I rename them to be more explicit for my taste

User · Answer

I m failing to see the problem here   The code looks good to me   The only thing I can think of is that the try catch blocks are redundant -- Color is a struct and R  G  and B are bytes  so c can t be null and c R ToString    c G ToString    and c B ToString   can t actually fail  the only way I can see them failing is with a NullReferenceException  and none of them can actually be null    You could clean the whole thing up using the following   private static String HexConverter System Drawing Color c        return       c R ToString  X2     c G ToString  X2     c B ToString  X2       private static String RGBConverter System Drawing Color c        return  RGB     c R ToString           c G ToString           c B ToString

User · Answer

You could keep it simple and use the native color translator   Color red   ColorTranslator FromHtml   FF0000    string redHex   ColorTranslator ToHtml red     Then break the three color pairs into integer form   int value   int Parse hexValue  System Globalization NumberStyles HexNumber

User · Answer

e g    ColorTranslator ToHtml Color FromArgb Color Tomato ToArgb       This can avoid the KnownColor trick

User · Answer

For hexadecimal code try this   Get ARGB  Alpha  Red  Green  Blue  representation for the color Filter out Alpha channel   amp  0x00FFFFFF Format out the value  as hexadecimal  X6  for hex    For RGB one   Just format out Red  Green  Blue values   Implementation  private static string HexConverter Color c      return String Format    0 X6    c ToArgb    amp  0x00FFFFFF      public static string RgbConverter Color c      return String Format  RGB  0   1   2     c R  c G  c B

[c#] Convert System.Drawing.Color to RGB and Hex Value

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