Added more methods to work with HEX-colors

RGB.NET.Core/Helper/ConversionHelper.cs

@@ -29,6 +29,32 @@
             return new string(c);
         }
 
+        // Source: https://web.archive.org/web/20180224104425/https://stackoverflow.com/questions/623104/byte-to-hex-string/3974535
+        /// <summary>
+        /// Converts the HEX-representation of a byte array to that array.
+        /// </summary>
+        /// <param name="hexString">The HEX-string to convert.</param>
+        /// <returns>The correspondending byte array.</returns>
+        public static byte[] HexToBytes(string hexString)
+        {
+            if ((hexString.Length == 0) || ((hexString.Length % 2) != 0))
+                return new byte[0];
+
+            byte[] buffer = new byte[hexString.Length / 2];
+            for (int bx = 0, sx = 0; bx < buffer.Length; ++bx, ++sx)
+            {
+                // Convert first half of byte
+                char c = hexString[sx];
+                buffer[bx] = (byte)((c > '9' ? (c > 'Z' ? ((c - 'a') + 10) : ((c - 'A') + 10)) : (c - '0')) << 4);
+
+                // Convert second half of byte
+                c = hexString[++sx];
+                buffer[bx] |= (byte)(c > '9' ? (c > 'Z' ? ((c - 'a') + 10) : ((c - 'A') + 10)) : (c - '0'));
+            }
+
+            return buffer;
+        }
+
         #endregion
     }
 }

RGB.NET.Core/Leds/Color.cs

@@ -215,6 +215,28 @@ namespace RGB.NET.Core
             return new Color(a, r, g, b);
         }
 
+        /// <summary>
+        /// Creates a new instance of the <see cref="T:RGB.NET.Core.Color" /> struct using a HEX-string. 
+        /// </summary>
+        /// <param name="hexString">The HEX-representation of the color.</param>
+        /// <returns>The color created from the HEX-string.</returns>
+        public static Color FromHexString(string hexString)
+        {
+            if ((hexString == null) || (hexString.Length < 6))
+                throw new ArgumentException("Invalid hex string", nameof(hexString));
+
+            if (hexString[0] == '#')
+                hexString = hexString.Substring(1);
+
+            byte[] data = ConversionHelper.HexToBytes(hexString);
+            if (data.Length == 3)
+                return new Color(data[0], data[1], data[2]);
+            if (data.Length == 4)
+                return new Color(data[0], data[1], data[2], data[3]);
+
+            throw new ArgumentException("Invalid hex string", nameof(hexString));
+        }
+
         #endregion
 
         private static (double h, double s, double v) CaclulateHSVFromRGB(byte r, byte g, byte b)