Avalonia 无法解析名称空间

Question

So I was using Avalonia, and needed to write a DataTemplate for a specific type. But when I set the DataType to the required type and run it, it throws this error.

D:\Some\Random\Path\Tachyon\src/App.axaml(9,23,9,23): Avalonia error XAMLIL:
Unable to resolve type FileTabItem from namespace https://github.com/avaloniaui Line 9, position 23. [D:\Some\Random\Path\Tachyon\Tachyon.csproj]
The build failed. Fix the build errors and run again.

This is where I need to access the namespace:

<TabControl>
    <TabControl.ContentTemplate>
        <DataTemplate DataType="srv:FileTabItem">
            <TextBlock Text="{Binding Content}"/>
        </DataTemplate>
    </TabControl.ContentTemplate>
</TabControl>

and how I've declared the srv variable(or whatever u call it idk I'm no expert in terminology)

<Window xmlns:srv="clr-namespace:Tachyon.Services">

Complete xaml file: https://paste.myst.rs/1eoeh40t

And yes, their is a namespace with FileTabItem as a class in it.

Answer 1

Avalonia also supports a Xamarin Forms style "using:" syntax for namespaces that tries harder to find namespaces for you...

<Window xmlns="https://github.com/avaloniaui"
        xmlns:srv="using:Tachyon.Services">

The only documentation I've found so far is in the features pull request:
Feature: alternative "using:" syntax to include namespace to XAML file