remove micro optimization and simplify HexStringToBytes

ILSpy.AddIn/Utils.cs

@@ -104,21 +104,9 @@ namespace ICSharpCode.ILSpy.AddIn
 		{
 			var result = new byte[hex.Length / 2];
 			for (int i = 0; i < hex.Length / 2; i++) {
-				result[i] = (byte)(ParseNibble(hex[i * 2]) * 16
-								 + ParseNibble(hex[i * 2 + 1]));
+				result[i] = Convert.ToByte(hex.Substring(i * 2, 2), 16);
 			}
 			return result;
 		}
-
-		static int ParseNibble(char c)
-		{
-			if (c >= '0' && c <= '9')
-				return c - '0';
-			if (c >= 'A' && c <= 'F')
-				return c - 'A' + 10;
-			if (c >= 'a' && c <= 'f')
-				return c - 'a' + 10;
-			throw new ArgumentException("Invalid hex digit: " + c);
-		}
 	}
 }