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WPF XAML editor error in Design time, But the application works fine in run time

Aug 8, 2014 at 7:50 AM
In my daily work, I faced an issue regarding WPF XAML editor. For example, I will use Dynamic Data Display in my project. Firstly, I will add the DynamicDataDisplay.DLL to my project. And then I will add a specific xmlns for this DLL. But I found there is no IntelliSense for the added DLL, I shared the screenshot on my OneDrive.
https://onedrive.live.com/redir?resid=6FF216CBAAA91C6%21351

Here is my project, https://onedrive.live.com/redir?resid=6FF216CBAAA91C6%21350

As you can see, I have referenced the DLL in my XAML Code, but the editor give me the error about

The type 'd3:ChartPlotter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built.

When I clicked the reloaded the designer. I tested this issue on VS 2010 SP1/VS 2013 Update2. But if I build this application. No errors, and it runs OK.

I am not an English speaker. if you cannot understand my question. please feel free to let me know. I will clarify it.

Any help would be appreciated! Thank You very much! :)