how to add a reference of a user control in a xaml file which is shared by two projects

问题

I have created a class library(CustomMapControl) in the solution and inside this class library I create a UserControl(MapItemsControl).
Now, I added a reference of this class library to both projects (Portogruaro & Trieste).

Here is my solution structure.



Portogruaro is the main project and has all files, Trieste has almost all the files which Portogruaro have added as a reference.

So, the problem is when I tried to use the CustomMapControl and drag and drop it in xaml from toolbox it doenst build and give this error

the name "MapsItemControl" doesnt exist in namespace "clr-namespace:CustomMapControl"

And sometimes it shows this error

Element is already a child of another element

Here is the xaml namespace

 xmlns:cc="clr-namespace:CustomMapControl"

and this is the user control in xaml

 <cc:MapItemsControl />      <cc:MapItemsControl />

The error changes when I open xaml file from different projects. The xaml file in which I want to have this UserControl is also shared between the two projects. I am quite sure that this is a referencing issue.
I have no idea how to reference the CustomMapControl so it will work for both the projects.

回答1:

You probably have a problem with how your namespace is added in your wpf project. Instead of:

xmlns:cc="clr-namespace:CustomMapControl"

try this:

xmlns:cc="clr-namespace:CustomMapControl;assembly=CustomMapControl"

来源：https://stackoverflow.com/questions/24715684/how-to-add-a-reference-of-a-user-control-in-a-xaml-file-which-is-shared-by-two-p