Can open any XAML window at design time.

[dmitrybv]

Current behavior

Created simple UnoApp
and started to change MainPage.xaml
After I try to change View type from UWP to to something else
https://platform.uno/docs/articles/Assets/quick-start/xaml-intellisense.png
I got error - ‘Empty path name is not legal’

And design window disappeared.
So now I can' open any XAML window at design time.
It always displays an error ‘Empty path name is not legal’

Expected behavior

How to reproduce it (as minimally and precisely as possible)

Workaround

Environment

Nuget Package:

• Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia
• Uno.WinUI / Uno.WinUI.WebAssembly / Uno.WinUI.Skia
• Uno.SourceGenerationTasks
• Uno.UI.RemoteControl / Uno.WinUI.RemoteControl
• Other:

Nuget Package Version(s):

Affected platform(s):

• iOS
• Android
• WebAssembly
• WebAssembly renderers for Xamarin.Forms
• macOS
• Skia
  • WPF
  • GTK (Linux)
  • Tizen
• Windows
• Build tasks
• Solution Templates

IDE:

• Visual Studio 2017 (version: )
• Visual Studio 2019 (version: Version 16.9.0 Preview 1.0)
• Visual Studio for Mac (version: )
• Rider Windows (version: )
• Rider macOS (version: )
• Visual Studio Code (version: )

Relevant plugins:

• Resharper (version: )

Anything else we need to know?

[MartinZikmund]

This is unfortunately an ongoing bug in Visual Studio (see here, closed as fixed, not really fixed completely yet). Maybe we should raise a new issue there to make sure they don't forget about it.

Try to use this workaround to see if it helps. It is also possible to right-click the XAML file, choose Open with... and then use a plain XML editor. However, IntelliSense is lost this way...

[dmitrybv]

The XAML editor may be empty
The XAML editor may be empty when the active editor project is not UWP.

To work around this issue, close all XAML editors, open a C# file and select 'UWP' in the top left drop-down list of the text editor sector. Once selected, re-open the XAML file

This workaround works. Thanks.

[radutomy]

@dmitrybv Same problem here. Where is the top left drop-down list exactly? I can't seem to find it.

[dmitrybv]

[MartinZikmund]

I have opened a new VS feedback for this here, please upvote to get their attention 🙂

[jeromelaban]

The editor also fails for other reasons, I also opened this issue, It's aggregated in this Uno issue #982.

[GF-Huang]

The XAML editor may be empty
The XAML editor may be empty when the active editor project is not UWP.

To work around this issue, close all XAML editors, open a C# file and select 'UWP' in the top left drop-down list of the text editor sector. Once selected, re-open the XAML file

This workaround works. Thanks.

Not work.

[jeromelaban]

Note that Visual Studio 16.9 Preview 2 fixes parts of this issue, and Preview 3 is likely to fix it completely.

[mddifilippo89]

As a work around simply right click the xaml page and choose Open With > Html Editor > Set as Default

[RichieSams]

Confirmed that Preview 3 fixed this issue for me

[MartinZikmund]

This is now working well :-)