1/ Install .NET Core 7.0
2/ Create WPF project with "dotnet new wpf"
3/ VSCode > Open Folder.

After awhile, VSCode shows many errors:

"The name 'InitializeComponent' does not exist in the current context"
Moreover, any variables declared in .XAML file will cause error if these variables are used in .CS file
Hope VSCode Dev Team will fix bugs soon, thank you very much !