global::Windows.UI.Xaml.Markup.IXamlType GetXamlTypeByName throws exception when trying to load Microsoft.UI.Xaml.Controls.StylesVersion

oregonduckman 6

During startup the app I am working on throws a System.IO.FileNotFoundException when global::Windows.UI.Xaml.Markup.IXamlType GetXamlTypeByName is called with the typeName = "Microsoft.UI.Xaml.Controls.StylesVersion". Any help on this would be appreciated.

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,861 Reputation points

2022-03-29T04:36:51.063+00:00

The exception looks you missed some assembly, can you share a repro sample or code where throw exception ?

oregonduckman 6

What would the debugging process be if I wanted to do this myself. Here are the declarations in the offending XAML file:

x:Class="SomeApp.Views.TreeViewPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:winui="using:Microsoft.UI.Xaml.Controls"
xmlns:templateSelectors="using:SomaApp"
xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls" xmlns:model="using:SomeApp.Core"
Style="{StaticResource PageStyle}"
mc:Ignorable="d">

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,861 Reputation points

2022-03-30T01:12:06.213+00:00

Well, can you try to remove Style="{StaticResource PageStyle}" for testing?
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,861 Reputation points

2022-03-30T06:05:36.98+00:00

I found you have used winui2, have you add XamlControlsResources in your App.xaml file?

oregonduckman 6

Is there a direct method of debugging these kinds of problems? Removing Style="{StaticResource PageStyle}" had no effect and my App.xaml already included XamlControlsResources as follows:

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <XamlControlsResources  xmlns="using:Microsoft.UI.Xaml.Controls" />
            <ResourceDictionary Source="/Styles/_Colors.xaml" />
            <ResourceDictionary Source="/Styles/_FontSizes.xaml" />
            <ResourceDictionary Source="/Styles/_Thickness.xaml" />

            <ResourceDictionary Source="/Styles/TextBlock.xaml" />
            <ResourceDictionary Source="/Styles/Page.xaml"/>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

</Application>

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,861 Reputation points

2022-03-31T01:10:25.923+00:00

it's hard to reproduce your problem with above code, can you provide reproduce sample, I will test base on that.
oregonduckman 6 Reputation points

2022-03-31T17:13:30.443+00:00

Since I am pretty new to UWP/XAML I am interested learning how to debug this stuff myself. Can you point me to some MS docs that explain options for debugging XAML bugs that cause exceptions like the one I am seeing in my app?
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,861 Reputation points

2022-04-01T00:53:20.17+00:00

Sure, please refer to XAML overview here.

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global::Windows.UI.Xaml.Markup.IXamlType GetXamlTypeByName throws exception when trying to load Microsoft.UI.Xaml.Controls.StylesVersion