In-Depth explanation of how to assign a Type Property in xaml

[Sarund9]

I am making a TreeView, and when creating the DataTemplate i have to assign the DataType Property.
But i keep getting " Unable to Resolve Type from namespace https://github.com/avaloniaui " error.

Code:

namespace MyAvaloniaApp
{
    public interface IMyInterface
    {
        string Name { get; set; }
    }
}

XAML:

<TreeDataTemplate DataType="MyAvaloniaApp.IMyInterface">
          
        </TreeDataTemplate>

Could someone give an explanation of how to assign a Type in xaml, or link to documentation about this (I couldn't find any)

[maxkatz6]

You need to define namespace:

<TreeDataTemplate xmlns:namespace="using:MyAvaloniaApp"
                                DataType="namespace:IMyInterface">
          
</TreeDataTemplate>

Or WPF style:

<TreeDataTemplate xmlns:namespace="clr-namespace:MyAvaloniaApp;assembly=MyAssemblyName"
                                DataType="namespace:IMyInterface">
          
</TreeDataTemplate>

This "xmlns" part is usually set on the root element of xml/xaml file.