color.Name returns a hex code instead of the corresponding color name for known colors

[Amy-Li03]

.NET version

.NET SDK 11.0.100-alpha.1.25619.109

Did it work in .NET Framework?

No

Did it work in any of the earlier releases of .NET Core or .NET 5+?

No

Issue description

Original feedback: 2671627

In a WinForms app, when the color under the cursor is retrieved, the color name is to be displayed using color.Name. When the color is a known color, say Red, the name displayed is “ffff0000” rather than “red”.

Steps to reproduce

1. Extract and run the WinForms app
   WinFormsApp56.zip
2. Click button on form designer
3. Observe the value of color.Name

[memoarfaa]

Yes this is doucumented see Remarks section in the documentation.
https://learn.microsoft.com/en-us/dotnet/api/system.drawing.color.name?view=net-10.0#remarks

This method returns either the user-defined name of the color, if the color was created from a name, or the name of the known color. For custom colors, the RGB value is returned.
Example:

 Color clr = Color.Red;
 Color clr = Color.FromKnownColor(KnownColor.Red);
Debug.WriteLine("Color Name: " + clr.Name);

if you need to Know if the RGB color is known color

 private void button1_Click(object sender, EventArgs e)
 {
     Color color = GetColorUnderCursor();
     Debug.WriteLine(DateTime.Now.ToString("hh:mm:ss.fff") + " Color under cursor: " + color.Name);
     Enum.GetValues<KnownColor>().ToList().ForEach(kc =>
     {
         Color knownColor = Color.FromKnownColor(kc);
         if (knownColor.ToArgb() == color.ToArgb())
         {
             Debug.WriteLine(DateTime.Now.ToString("hh:mm:ss.fff") + " Matched Known Color: " + knownColor.Name);
             Debug.WriteLine("Color Name: " + knownColor.Name);
         }
     });
   

 }

[LeafShi1]

screenCapture.GetPixel(0, 0) essentially reads the ARGB value from the bitmap pixel. The resulting Color is a "numerical color" and does not carry information about its origin, such as "it's named Red" (it wasn't created using FromKnownColor(KnownColor.Red)). Therefore, according to the documentation, it is not a KnownColor.