CODEWITHSUNDEEP
c#wpfxamlreferencenamespaces
Jesse
Jesse

Reputation: 99

Class doesn't exist in namespace error in XAML

I have class, that selects the ItemDataTemplate for objects. But I can't reference it in my XAML code. (Page.Resources).

It's the Items page in XAML. The class is in the commons folder, and I've referenced the commons folder here:

xmlns:common="using:Sample_App.Common"

and then when I wan't to add it to my XAML:

<common:MyDataTemplateSelector x:Key="Selector" AdTemplate="{StaticResource Ad}" NormalTemplate="{StaticResource Normal}"></common:MyDataTemplateSelector>

I get the following error:

The name "MyDataTemplateSelector" does not exist in the namespace "using:MyDataSelector"

Here's the MyDataSelector class:

namespace MyDataSelector
{
    private class MyDataTemplateSelector : DataTemplateSelector
    {
        public DataTemplate NormalTemplate { get; set; }

        public DataTemplate AdTemplate{ get; set; }

        protected override DataTemplate SelectTemplateCore(object item, DependencyObject container)
        {
            if (item is TestApp.Mainpage.NormalData)
                return NormalTemplate
            if (item is TestApp.Mainpage.AdData)
                return AdTemplate;

            return SelectTemplateCore(item, container);
        }
    }
}

Upvotes: 2

Views: 8640

Answers (1)

ChimeraObscura
ChimeraObscura

Reputation: 1964

You have a couple problems with your code. First of all, you mention that your class is in "the commons folder" - this is totally irrelevant. The location of a code file generally doesn't matter to the compiler, but the namespace you declare the class in does matter.

namespace MyDataSelector // <- This is where your class can be found
{
    private class MyDataTemplateSelector : DataTemplateSelector
    {

So since your class is in the namespace MyDataSelector, the reference in your xaml files should look something like this:

<Page x:Class="WpfApplication1.Page1"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:myDataSelector="using:MyDataSelector">

And you would reference your class like this:

<myDataSelector:MyDataTemplateSelector />

Another issue is that your class is declared as private. That doesn't make sense and probably won't compile. Remove private to make your class internal, or change it to public.

Upvotes: 3

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