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POXAML Designer "cannot find type" when converters are in UserControl.Resources
 

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  1. POXAML Designer "cannot find type" when converters are in UserControl.Resources
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    <p>I have a WPF UserControl with binding converters referenced like this:</p> <pre><code>&lt;UserControl x:Class="MyControl" x:Name="MyControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TheMainNamespaceOfThisAssembly"&gt; &lt;UserControl.Resources&gt; &lt;local:ConfidenceColorConverter x:Key="ConfidenceColorConverter"/&gt; &lt;/UserControl.Resources&gt; </code></pre> <p>I then use the binding converter later. I see the user control in my design window. Then I compile, then place this user control in my main window. I run it and it works. However, I still would like to use the designer on the main window, which breaks with: </p> <blockquote> <p>Could not create an instance of type 'MyControl'.</p> </blockquote> <p>So I learned <a href="http://msdn.microsoft.com/en-us/library/bb514636.aspx" rel="nofollow noreferrer">how to debug the designer</a>; when I do, I get an XamlParseException:</p> <blockquote> <p>Cannot find type 'TheMainNamespaceOfThisAssembly.ConfidenceColorConverter'. The assembly used when compiling might be different than that used when loading and the type is missing. Error in markup file...</p> </blockquote> <p>If remove the references to the converters, my user control displays well in the designer on the main window. <strong>Any ideas how to fix my references to the converters so that they won't break the designer?</strong></p> <p>Couldn't understand if the article <a href="http://msdn.microsoft.com/en-us/library/bb546934.aspx#ResourcesatDesignTime" rel="nofollow noreferrer">Troubleshooting WPF Designer Load Failures</a> applies or not.</p>
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    1. USPatrick Szalapski
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      1. USPatrick Szalapski
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    1. COI couldn't get any sort of error due to similar class name and key, so I deleted my answer. I have to ask the obvious: You do have a class called `ConfidenceColorConverter` in the assembly, right? Is it public?
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      1. USJoel B Fant
    2. COYes; ConfidenceColorConverter, MyControl, and MainWindow are all in the same project with project namespace TheMainNamespaceOfThisAssembly.
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      1. USPatrick Szalapski
    3. COPlease try to reproduce this on a clean project. This *should not* fail, so it is important to reproduce it without any odd side-effects from the project.
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      1. USSander
 

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