Question

I am converting some Silverlight XAML into WPF. I currently have a user control (MyControl) that is trying to include a couple of other controls that are custom buttons (MyButton1) that are within the same assembly. I have the following XAML that compiles and works in SL:

MyButton1

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    x:Class="MyCompany.MyNamespace.MySubnamespace.MyButton1"
    d:DesignWidth="640" d:DesignHeight="480">
    ...
</UserControl>

MyControl

<UserControl
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:somename="clr-namespace:MyCompany.MyNamespace.MySubnamespace;assembly=MyCompany.MyAssemblyName"
    mc:Ignorable="d"
    x:Class="MyCompany.MyNamespace.MySubnamespace.MyControl"
    d:DesignWidth="640" d:DesignHeight="480">

    <somename:MyButton1 />

</UserControl>

When I try to compile this code in WPF, I get the following error:

The tag ‘MyButton1’ does not exist in XML namespace ‘clr-namespace:MyCompany.MyNamespace.MySubnamespace;assembly=MyCompany.MyAssemblyName.’

The weird thing is, if I comment out the <somename:MyButton1 /> line of code and compile and then type in <somename: IntelliSense gives me the option to autocomplete MyButton1. Which suggests that the control itself is in the assembly but for some reason it is not being seen when the MyControl XAML is being compiled.

For some context, I took the SL csproj file and made some modifications to it manually to make it a WPF csproj file. If there is a possibility that this caused this funkiness to happen, I’d be glad to share relevant portions of the project file.

Answer 1

Found the answer on an MSDN forum. Turns out that the assembly=MyCompany.MyAssemblyName line in my xmlns was screwing things up. Once I removed that line, I was able to reference the controls.

Related Link: http://social.msdn.microsoft.com/Forums/en/wpf/thread/807c9b80-81c7-4f75-aa2f-8427e17b1a90