C#•4mo ago

✅ Switching from ReactiveUI to CommunityToolkit

<Window xlmns="https://github.com/avaloniaui"
        xlmns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="Diary.Views.MainWindowView"
        Icon="/Assets/logo.ico"
        Width="1500"
        Height="850"
        Title="Diary"
        Content="{Binding Content}"
        WindowStartupLocation="CenterScreen">
</Window>

<Window xlmns="https://github.com/avaloniaui"
        xlmns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="Diary.Views.MainWindowView"
        Icon="/Assets/logo.ico"
        Width="1500"
        Height="850"
        Title="Diary"
        Content="{Binding Content}"
        WindowStartupLocation="CenterScreen">
</Window>

I'm using CommunityToolkit now and I'm getting the error on the line Content="{Binding Content}"

AVLN:00C Cannot parse a compiled binding without an explicit x:DataType directive to give a starting data type for bindings

AVLN:00C Cannot parse a compiled binding without an explicit x:DataType directive to give a starting data type for bindings

and I'm not sure what to do. This works just fine in ReactiveUI

12 Replies

leowest•4mo ago

  <Design.DataContext>
    <!-- This only sets the DataContext for the previewer in an IDE,
         to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
    <vm:MainViewModel />
  </Design.DataContext>

  <Design.DataContext>
    <!-- This only sets the DataContext for the previewer in an IDE,
         to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
    <vm:MainViewModel />
  </Design.DataContext>

and inside the window

x:DataType="vm:MainViewModel"

x:DataType="vm:MainViewModel"

assuming that is what your mainwindowview viewmodel is called and xmlns:vm="using:Diary.ViewModels"

Mekasu0124•4mo ago

I just figured it out. I had to edit the project's file

- <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+ <AvaloniaUseCompiledBindingsByDefault>false</AvaloniaUseCompiledBindingsByDefault>

- <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+ <AvaloniaUseCompiledBindingsByDefault>false</AvaloniaUseCompiledBindingsByDefault>

leowest•4mo ago

ok but are u not missing those? the default Avalonia template with CTK generate those above I listed also my default binding is set to true

Mekasu0124•4mo ago

it did have them, but I haven't needed them. I have it setup like

leowest•4mo ago

u have a viewlocator

Mekasu0124•4mo ago

<Window ...
        Content = "{Binding Content}">
...

<Window ...
        Content = "{Binding Content}">
...

public MainWindowViewModel : ViewModelBase
{
    ViewModelBase _content;

    public MainWindowViewModel() {}
    public void Update(...)
    {
        Content = new UpdateAvailableViewModel(...);
    }
}

public MainWindowViewModel : ViewModelBase
{
    ViewModelBase _content;

    public MainWindowViewModel() {}
    public void Update(...)
    {
        Content = new UpdateAvailableViewModel(...);
    }
}

when I was using reactive ui

leowest•4mo ago

ah ok

Mekasu0124•4mo ago

yea. the main window view model is built to serve as the window manager for the application every screen shows within the main window and the main window just knows when to show what screen based off what user interaction

leowest•4mo ago

well glad u figured it out 😉

Mekasu0124•4mo ago

thanks. Althought Community Toolkit removes a lot of boiler plate, I just hope it's not too much of a headache to work with

leowest•4mo ago

I like it, its really nice imo very light weight $close

MODiX•4mo ago

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✅ Switching from ReactiveUI to CommunityToolkit