Problem with Avalonia XAML parser

[IAbstract]

Have this XAML:

<UserControl xmlns="https://github.com/avaloniaui"
             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:i="clr-namespace:Avalonia.Xaml.Interactivity;assembly=Avalonia.Xaml.Interactivity"
             xmlns:ia="clr-namespace:Avalonia.Xaml.Interactions.Core;assembly=Avalonia.Xaml.Interactions"
             xmlns:media="clr-namespace:RazorSoft.Dexter.Media;assembly=RazorSoft Dexter Media"
             mc:Ignorable="d" d:DesignWidth="340" d:DesignHeight="450"
             x:Class="RazorSoft.Dexter.Views.Portfolio"
             Background="#1E1E1E"
             HorizontalAlignment="Stretch">

  <UserControl.DataContext>
    <media:PortfolioCollectionViewModel />
  </UserControl.DataContext>

  <Border MinWidth="340"
          MaxWidth="340"
          Padding="2"
          BorderBrush="DarkBlue"
          BorderThickness="1">
    <Grid>
      <Grid.RowDefinitions>
        <RowDefinition Height="6*" />
        <RowDefinition Height="9*" />
        <RowDefinition Height="15" />
      </Grid.RowDefinitions>

      <Grid HorizontalAlignment="Stretch"
            VerticalAlignment="Stretch">
        <Grid.RowDefinitions>
          <RowDefinition Height="22" />
          <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <Grid Grid.Row="0"
              Background="LightGray"
              VerticalAlignment="Top">
          <Menu Grid.Column="0"
                Height="17">
            <MenuItem Header="Portfolios"
                      Margin="0, 1, 1, 0"
                      Foreground="#132A89"
                      FontSize="12">
              <MenuItem Header="New">
                <MenuItem Header="Portfolio" />
                <MenuItem Header="Template" />
              </MenuItem>

              <MenuItem Header="Edit">
                <MenuItem Header="Portfolio" />
                <MenuItem Header="Template" />
              </MenuItem>

              <Separator />

              <MenuItem Header="Delete">
                <MenuItem Header="Portfolio" />
                <MenuItem Header="Template" />
              </MenuItem>
            </MenuItem>
          </Menu>
        </Grid>

        <Border Grid.Row="1"
                BorderBrush="DarkBlue"
                BorderThickness="1">

          <ScrollViewer>
            <ItemsRepeater Items="{Binding Portfolios}"
                           Background="AliceBlue">
              <ItemsRepeater.ItemTemplate>
                <DataTemplate>
                  <Label Name="PortfolioItem"
                         Content="{Binding Name}"
                         Height="20"
                         FontSize="12"
                         Background="{Binding Background}"
                         Foreground="{Binding Foreground}">
                    <i:Interaction.Behaviors>
                      <ia:EventTriggerBehavior EventName="PointerLeave" 
                                               SourceObject="{Binding #PortfolioItem}">
                        <ia:InvokeCommandAction Command="{Binding PointerLeaveCommand}"/>
                      </ia:EventTriggerBehavior>
                      <ia:EventTriggerBehavior EventName="PointerMoved" 
                                               SourceObject="{Binding #PortfolioItem}">
                        <ia:InvokeCommandAction Command="{Binding PointerMovedCommand}"/>
                      </ia:EventTriggerBehavior>
                    </i:Interaction.Behaviors>
                  </Label>
                </DataTemplate>
              </ItemsRepeater.ItemTemplate>
            </ItemsRepeater>
          </ScrollViewer>

        </Border>
      </Grid>

    </Grid>
  </Border>

</UserControl>

I'm using the Avalonia VS plugin. Everything displayed properly in the preview panel until I added the interaction & interactivity bits. Now, the preview panel says Invalid Markup.

This has happened before. I manually re-built the entire project as I had only one view at the time. Now I've got many and this will be annoying to work around. This UserControl is part of a larger window. When I view the larger window, it appears as a little bitty square.

I'm really trying to make this work. I want this to work...

[kekekeks]

Invalid Markup

It should show more relevant info in the error list IIRC (sorry, haven't used visual studio for years)

[IAbstract]

Output from Avalonia Diagnostics:

06:15:27.353 [Information] 9352 Stopping previewer process
06:15:27.354 [Information] Process exited
06:15:27.355 [Information] Stopping previewer process
06:16:01.475 [Information] Starting previewer process for '"C:\LSLT Software Development\RazorSoft.Dexter\source\DexterPro\bin\Debug\net5.0\DexterPro.dll"'
06:16:01.478 [Information] 19272 Started previewer process for '"C:\LSLT Software Development\RazorSoft.Dexter\source\DexterPro\bin\Debug\net5.0\DexterPro.dll"'. Waiting for connection to be initialized.
06:16:05.274 [Information] 19272 Connection initialized
06:16:09.878 [Error] 19272 UpdateXamlResult error
System.Xaml.XamlException: Exception has been thrown by the target of an invocation.

[kekekeks]

That error is not related to the xaml parser. Parser itself has successfully compiled XAML, the exception was thrown during the loading.
To diagnose such errors I suggest to load your solution into a second instance of visual studio, attach debugger to design process of the first instance (should be a dotnet.exe instance with Avalonia.Designer.HostApp.dll somewhere in the command line) and then change the xaml by adding a space somewhere.

You should see what is causing the error.

[grokys]

Looks like we need to unwrap TargetInvocationExceptions when running in the designer to get more information.

[IAbstract]

That's a horrible solution. It may be the only way to figure it out... but that doesn't make it not horrible.

…

On Wed, Sep 1, 2021, 14:59 Nikita Tsukanov ***@***.***> wrote: That error is not related to the xaml parser. Parser itself has successfully compiled XAML, the exception was thrown during the loading. To diagnose such errors I suggest to load your solution into a second instance of visual studio, attach debugger to design process of the first instance (should be a dotnet.exe instance with Avalonia.Designer.HostApp.dll somewhere in the command line) and then change the xaml by adding a space somewhere. You should see what is causing the error. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#6519 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAHRCJ5H3DJKZBQZ6BW7TH3T72A27ANCNFSM5DFZIRXQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.