How to check wpf window's state.

Question

I want to check if a wpf windows is hidden then show it and if it is closed (by close button or by any other methods) then create new and show it.

Answer 1

check the Visibility property on the window. If it is not Visible call Show()

Answer 2

Use the Window.Closed event handler to do something creative. ie, You can set some property in the ViewModel and send a message to other ViewModels.

Check this sample. It may take time to understand. But worth knowing it.

Or you can use the Window.Closing event handler to cancel the user action.