dotnet__skills/tests/dotnet-maui/maui-data-binding/eval.yaml

scenarios:
  - name: "Set up compiled bindings with x:DataType on a page"
    prompt: |
      I have a .NET MAUI ContentPage called SettingsPage.xaml that currently uses
      plain bindings with no x:DataType. The page's BindingContext is a
      SettingsViewModel with properties: string Theme, bool NotificationsEnabled,
      and int FontSize. Convert this page to use compiled bindings and tell me
      how to catch binding errors at build time.
    assertions:
      - type: "output_contains"
        value: "x:DataType"
      - type: "output_matches"
        pattern: "(?i)SettingsViewModel"
      - type: "output_matches"
        pattern: "XC0022|XC0025|WarningsAsErrors"
    rubric:
      - "Places x:DataType on the ContentPage root element pointing to SettingsViewModel"
      - "Does not scatter x:DataType on child elements or use x:DataType='x:Object'"
      - "Recommends enabling XC0022 and/or XC0025 as warnings-as-errors in the .csproj"
      - "Explains that compiled bindings are faster and required for NativeAOT/trimming"
    timeout: 120

  - name: "Implement MVVM ViewModel with ObservableObject"
    prompt: |
      I need to create a ProductDetailViewModel for a .NET MAUI app. It should
      have properties for Name (string), Price (decimal), IsAvailable (bool),
      and a LoadCommand that fetches data asynchronously. Show me how to
      implement this with proper change notification so bindings update the UI.
    assertions:
      - type: "output_matches"
        pattern: "(?i)ObservableObject|INotifyPropertyChanged"
      - type: "output_matches"
        pattern: "(?i)ObservableProperty|PropertyChanged"
      - type: "output_matches"
        pattern: "(?i)RelayCommand|ICommand"
    rubric:
      - "Uses CommunityToolkit.Mvvm ObservableObject with [ObservableProperty] or implements INotifyPropertyChanged manually"
      - "Includes all four members: Name, Price, IsAvailable, and a load command"
      - "Shows how the generated properties raise PropertyChanged automatically when using the toolkit"
      - "Does not use a base class that doesn't implement INotifyPropertyChanged"
    timeout: 120

  - name: "Create and use an IValueConverter"
    prompt: |
      In my .NET MAUI app I have a status field that is an enum:
      enum OrderStatus { Pending, Shipped, Delivered, Cancelled }.
      I want to display a different color for each status in a Label's TextColor.
      Show me how to create a value converter and wire it up in XAML.
    assertions:
      - type: "output_contains"
        value: "IValueConverter"
      - type: "output_matches"
        pattern: "(?i)Convert"
      - type: "output_matches"
        pattern: "(?i)StaticResource|x:Key"
    rubric:
      - "Implements IValueConverter with a Convert method that maps each enum value to a Color"
      - "Declares the converter in XAML resources with an x:Key"
      - "Shows the binding syntax with Converter={StaticResource ...}"
      - "Handles the default/fallback case in the converter"
    timeout: 120

  - name: "Diagnose missing BindingContext and non-compiled bindings"
    prompt: |
      My .NET MAUI page shows blank labels even though my ViewModel properties
      have values. Here is my XAML:
      ```xml
      <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                   xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">
          <VerticalStackLayout>
              <Label Text="{Binding Title}" />
              <Label Text="{Binding Description}" />
          </VerticalStackLayout>
      </ContentPage>
      ```
      What am I doing wrong?
    assertions:
      - type: "output_matches"
        pattern: "(?i)BindingContext"
      - type: "output_matches"
        pattern: "(?i)x:DataType"
    rubric:
      - "Identifies that BindingContext is never set on the page"
      - "Shows how to set BindingContext either in XAML or code-behind"
      - "Points out the missing x:DataType and recommends compiled bindings"
      - "Explains that without BindingContext, bindings resolve to null and display empty"
    timeout: 120