XamlParseException when using UserControl from class library dll

Question

I created a library that has a Popup UserControl similar to the one here .

When I create a new universal Windows application and create the same UserControl inside the application and open a popup, it will open.

But if I create a class library and create the same UserControl inside it and try to use it (by opening a popup window) inside the application, I get a XamlParseException.

It looks like this:

Windows.UI.Xaml.Markup.XamlParseException event occurred
HResult = -2144665590
Error Message = XAML.
Source = Windows
Stacktrace:
on Windows.UI.Xaml.Application.LoadComponent (object component, Uri resourceLocator, ComponentResourceLocation componentResourceLocation)
in PopupTestLibrary.MyUserControl1.InitializeComponent ()

I can’t understand exactly why this is happening, since the code works fine when not being called from an external class library.

Some questions I found similar to mine here on SO are

XamlParseException when using a page from a library

Unable to create UserControl instance from another assembly

All help is appreciated!

Answer 1

You need to add a resource dictionary to your application and add Usercontrol Xaml content to it

since Xaml is considered as a content file not compiled into code

Answer 2

I think this post is just like yours ..:

https://social.msdn.microsoft.com/Forums/en-US/63f071be-a3c5-4f2d-ace2-73ca750e3252/rtm-usercontrol-class-library-and-assembly-name-with-

And, this is a known issue:

The dot in the project name throws a XAMLParseException

I hope this helps you with your problem.