Creating new items in Visual Studio doesn't replace invalid characters in namespace

[joe7057]

Describe the bug

Normally when creating a new file in Visual Studio, if the project name has an invalid character such as a dash ("-"), when a new file is generated, the namespace will use a substituted valid character, such as an underscore ("_"). The Avalonia item types (Class, Window, etc.) do not do this, resulting in un-compliable code.

To Reproduce

Steps to reproduce the behavior:

1. Create a new Avalonia project in Visual Studio and choose a project name that includes the character "-".
2. Build the project. It will build properly.
3. In solution explorer, right-click on a folder and choose "Add" -> "New Item". Add a class, Avalonia Window, Avalonia UserControl, or other Avalonia item.
4. Check the namespace that is auto-defined in the associated .cs file. It will contain the "-", which is not an allowed character in the namespace. The code will not compile.

Expected behavior

The "-" should be removed or substituted with a valid character. Microsoft uses "_".

Screenshots

Environment

• OS: Windows
• Avalonia-Version: 11.0.6
• IDE: Visual Studio 2022 Community Edition

[hez2010]

I believe this should be reported to Roslyn repo. There's nothing we can do on the Avalonia side.