app.xaml“无法在设计视图中编辑”

Question

I am building a wpf form in c#. two hours ago I opened my project and the design view was closed. I've tried right clicking the form and pressing "open with...", but no option appears to open it in design view.

Answer 1

The App.xaml then isn't probably the file you wanted to edit. If you wanted to change something in a designer, check for your MainWindow.xaml . This is by default the first Window which shows up, after starting your application.

For your information: The default Window which opens up at startup can be set in App.xaml with the MainWindow property.