Today I opened my Xamarin project, but my main XAML file looks like this!
Not all files look like this, the editor is ok.
I have no backup file for this one, is there any way to fix the file?
Bite the bullet, recreate the view.
Next time use a version control service such that you always have a version of your code to fall back to. Github and other services provide free private repositories if you don't want your code to be public.
Always back up...