Update src/Avalonia.Controls.ColorBlender/HtmlColorConverter.cs

src/Avalonia.Controls.ColorBlender/HtmlColorConverter.cs

@@ -13,12 +13,7 @@ namespace Avalonia.Controls.ColorBlender
 
         public object Convert(IList<object> values, Type targetType, object parameter, CultureInfo culture)
         {
-            string color = "#";
-            foreach (byte val in values)
-            {
-                color += val.ToString("X2");
-            }
-            return color;
+            return $"#{((byte)values[0]).ToString("X2")}{((byte)values[1]).ToString("X2")}{((byte)values[2]).ToString("X2")}";
         }
     }
 }