Windows 10 Complains About Namespace

[Mike-E-angelo]

I have the following Xaml:

<presentation:ApplicationBase x:Class="Root.Mobile.Application.App"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:utum="using:Uno.Toolkit.UI.Material"
       xmlns:presentation="clr-namespace:DragonSpark.Application.Mobile.Presentation;assembly=DragonSpark.Application.Mobile">

  <Application.Resources>
    <ResourceDictionary>
      <ResourceDictionary.MergedDictionaries>
        <!-- Load WinUI resources -->
        <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
        <utum:MaterialToolkitTheme
          ColorOverrideSource="ms-appx:///Styles/ColorPaletteOverride.xaml">
          <!-- NOTE: You can override the default Roboto font by providing your font assets here. -->
          <!-- <utum:MaterialToolkitTheme.FontOverrideDictionary>
            <ResourceDictionary>
              <FontFamily x:Key="MaterialLightFontFamily">ms-appx:///Uno.Fonts.Roboto/Fonts/Roboto-Light.ttf#Roboto</FontFamily>
              <FontFamily x:Key="MaterialMediumFontFamily">ms-appx:///Uno.Fonts.Roboto/Fonts/Roboto-Medium.ttf#Roboto</FontFamily>
              <FontFamily x:Key="MaterialRegularFontFamily">ms-appx:///Uno.Fonts.Roboto/Fonts/Roboto-Regular.ttf#Roboto</FontFamily>
            </ResourceDictionary>
          </utum:MaterialToolkitTheme.FontOverrideDictionary> -->
        </utum:MaterialToolkitTheme>
      </ResourceDictionary.MergedDictionaries>

      <!-- Add resources here -->

    </ResourceDictionary>
  </Application.Resources>

</presentation:ApplicationBase>

ApplicationBase is found here:
https://github.com/DragonSpark/Framework/blob/3285bbc11632852fbf5fc9dd5e2ff1568ecd1b0b/DragonSpark.Application.Mobile/Presentation/ApplicationBase.cs#L8-L8

On build all platforms are happy with the exception of UWP/net9.0-windows10.0.26100 ... It produces the following error:

6>...\Root.Mobile\Root.Mobile.Application\App.xaml(1,2): XamlCompiler error WMC0001: Unknown type 'ApplicationBase' in XML namespace 'clr-namespace:DragonSpark.Application.Mobile.Presentation;assembly=DragonSpark.Application.Mobile'

I've tried cleaning, rebuilding, and restarting Visual Studio. No variations of these activities seems to fix this issue.

Additionally, this seemed to compile fine until I upgraded to the newest Uno extension. 🤔 I am wondering if there is a known bug/issue here.

Thank you for any assistance you can provide. 🙏

[jeromelaban]

Thanks for the question.

The WPF format:

xmlns:presentation="clr-namespace:DragonSpark.Application.Mobile.Presentation;assembly=DragonSpark.Application.Mobile"

is not supported by winui. You'll need to use:

xmlns:presentation="using:DragonSpark.Application.Mobile.Presentation"

[Mike-E-angelo]

Wow thank you for the pointer @jeromelaban I will file a bug with ReSharper as that is what generated the namespace.

[Mike-E-angelo]

Looks like it's already known: https://youtrack.jetbrains.com/issue/RSRP-497732/Prefer-using-syntax-over-clr-namespace-synax-in-Uno-apps