Question

I was trying to follow this tutorial on user settings:

http://blogs.msdn.com/b/patrickdanino/archive/2008/07/23/user-settings-in-wpf.aspx

I defined a setting whose name was Selected, type int, scope user. In App.xaml, I had:

<Application.Resources>
        <properties:Selected x:Key="Selected"/>
    </Application.Resources>

However I got this error message:

“The namespace prefix “properties” is not defined”

I couldn’t figure out why…Any suggestions are welcome.

PS. If you could take a look at another question of mine, it would be great! 🙂

Cannot find source for binding

Edit:
Solved!

Answer 1

You need to make sure the properties namespace is defined somewhere, as shown in the example you linked:

<Application x:Class="SampleApp.App"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:properties="clr-namespace:SampleApp.Properties"
   Exit="OnExit"
   StartupUri="MainWindow.xaml">
     <Application.Resources>
         <properties:Settings x:Key="Settings" />
     </Application.Resources>
</Application>

Notice the line: xmlns:properties="clr-namespace:SampleApp.Properties"

You may need to recompile before this error goes away.