WPF: XAML namespace

Question

I have one assembly XAML registered in AssemblyInfo.cs:

[assembly: XmlnsDefinition("http://schemas.mysite.es/wpf", "SWC.ViewModels")]

And In my namespace I hace these classes:

namespace SWC.ViewModels { public class MenuViewModel : ObservableCollection<MenuViewModel> { public MenuViewModel() : base() { } } }

If I use the namespace in a user control XAML,

<UserControl x:Class="SWC.UserControls.UserMenu" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:customMenu="http://schemas.mysite.es/wpf">

I can use the class in my XMLNS namespace,

<UserControl.Resources> <customMenu:MenuViewModel x:Key="MenuItemsSource">

But, when I execute the application, the compiler said

The label 'MenuViewModel' dosen't exist in the namespace XML 'http://schemas.mysite.es/wpf'

All, can help me?? I'm crazy with this problem!! Best regards,

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– Antal Spector-Zabusky, Commented Dec 29, 2010 at 7:16

Andrei Pana · Accepted Answer · 2010-12-29 07:35:43Z

I think you need to specify the assembly in which your customMenu controls exist. The assembly must also be referenced from the project (in the References section).

xmlns:customMenu="clr-namespace:customMenuNamespace;assembly=customMenuLibrary"

Otherwise I don't see how the compiler can find your implementation only through "http://schemas.mysite.es/wpf". What's at that address? The two microsoft schemas

http://schemas.microsoft.com/winfx/2006/xaml/presentation http://http://schemas.microsoft.com/winfx/2006/xaml

work like some identifiers for the xaml compiler, there is nothing at those addresses.

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