[ColorPicker] HEX format tweak (#13989)

* Added HEX2

* Revert "Added HEX2"

This reverts commit 6d7b23fd74.

* Lowercase HEX without hash

* Update ColorRepresentationHelper.cs

* Update expect.txt

Co-authored-by: Laute <Niels.Laute@philips.com>

src/modules/colorPicker/ColorPickerUI/Helpers/ColorRepresentationHelper.cs

@@ -77,7 +77,7 @@ namespace ColorPicker.Helpers
         /// <param name="color">The see cref="Color"/> for the hexadecimal presentation</param>
         /// <returns>A hexadecimal <see cref="string"/> representation of a RGB color</returns>
         private static string ColorToHex(Color color)
-            => $"#{color.R.ToString("X2", CultureInfo.InvariantCulture)}"
+            => $"{color.R.ToString("X2", CultureInfo.InvariantCulture)}"
              + $"{color.G.ToString("X2", CultureInfo.InvariantCulture)}"
              + $"{color.B.ToString("X2", CultureInfo.InvariantCulture)}";
 

src/modules/colorPicker/ColorPickerUI/ViewModels/ColorEditorViewModel.cs

@@ -148,7 +148,9 @@ namespace ColorPicker.ViewModels
                 new ColorFormatModel()
                 {
                     FormatName = ColorRepresentationType.HEX.ToString(),
-                    Convert = (Color color) => { return ColorRepresentationHelper.GetStringRepresentationFromMediaColor(color, ColorRepresentationType.HEX); },
+#pragma warning disable CA1304 // Specify CultureInfo
+                    Convert = (Color color) => { return ColorRepresentationHelper.GetStringRepresentationFromMediaColor(color, ColorRepresentationType.HEX).ToLower(); },
+#pragma warning restore CA1304 // Specify CultureInfo
                 });
 
             _allColorRepresentations.Add(

src/modules/colorPicker/UnitTest-ColorPickerUI/Helpers/ColorRepresentationHelperTest.cs

@@ -14,7 +14,7 @@ namespace Microsoft.ColorPicker.UnitTests
     {
         [TestMethod]
         [DataRow(ColorRepresentationType.CMYK, "cmyk(0%, 0%, 0%, 100%)")]
-        [DataRow(ColorRepresentationType.HEX, "#000000")]
+        [DataRow(ColorRepresentationType.HEX, "000000")]
         [DataRow(ColorRepresentationType.NCol, "R0, 0%, 100%")]
         [DataRow(ColorRepresentationType.HSB, "hsb(0, 0%, 0%)")]
         [DataRow(ColorRepresentationType.HSI, "hsi(0, 0%, 0%)")]