Agent skill
implementing-communitytoolkit-mvvm
Implements MVVM pattern using CommunityToolkit.Mvvm with ObservableProperty attributes. Use when building ViewModels with source generators or implementing commands in WPF.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/implementing-communitytoolkit-mvvm-christian289-dotnet-with-claudeco-2
SKILL.md
CommunityToolkit.Mvvm Code Guidelines
A guide for implementing MVVM pattern using CommunityToolkit.Mvvm in WPF.
Project Structure
The templates folder contains a WPF project example (use latest .NET per version mapping).
templates/
├── WpfMvvmSample.App/ ← WPF Application Project
│ ├── Views/
│ │ ├── MainWindow.xaml
│ │ └── MainWindow.xaml.cs
│ ├── App.xaml
│ ├── App.xaml.cs
│ ├── GlobalUsings.cs
│ └── WpfMvvmSample.App.csproj
└── WpfMvvmSample.ViewModels/ ← ViewModel Class Library (UI framework independent)
├── UserViewModel.cs
├── GlobalUsings.cs
└── WpfMvvmSample.ViewModels.csproj
Basic Principle
Use CommunityToolkit.Mvvm as the default for MVVM structure
ObservableProperty Attribute Writing Rules
Single Attribute - Write Inline
// ✅ Good: Single attribute written inline
[ObservableProperty] private string _userName = string.Empty;
[ObservableProperty] private int _age;
[ObservableProperty] private bool _isActive;
Multiple Attributes - ObservableProperty Always Inline
// ✅ Good: Multiple attributes, ObservableProperty always inline
[NotifyPropertyChangedRecipients]
[NotifyCanExecuteChangedFor(nameof(SaveCommand))]
[ObservableProperty] private string _email = string.Empty;
[NotifyDataErrorInfo]
[Required(ErrorMessage = "Name is required.")]
[MinLength(2, ErrorMessage = "Name must be at least 2 characters.")]
[ObservableProperty] private string _name = string.Empty;
[NotifyPropertyChangedRecipients]
[NotifyCanExecuteChangedFor(nameof(DeleteCommand))]
[NotifyCanExecuteChangedFor(nameof(UpdateCommand))]
[ObservableProperty] private User? _selectedUser;
Bad Example
// ❌ Bad: ObservableProperty on separate line
[NotifyPropertyChangedRecipients]
[NotifyCanExecuteChangedFor(nameof(SaveCommand))]
[ObservableProperty]
private string _email = string.Empty;
Complete ViewModel Example
namespace MyApp.ViewModels;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
public sealed partial class UserViewModel : ObservableObject
{
// Single attribute
[ObservableProperty] private string _firstName = string.Empty;
[ObservableProperty] private string _lastName = string.Empty;
[ObservableProperty] private int _age;
// Multiple attributes - ObservableProperty inline
[NotifyPropertyChangedRecipients]
[NotifyCanExecuteChangedFor(nameof(SaveCommand))]
[ObservableProperty] private string _email = string.Empty;
[NotifyCanExecuteChangedFor(nameof(DeleteCommand))]
[NotifyCanExecuteChangedFor(nameof(UpdateCommand))]
[ObservableProperty] private User? _selectedUser;
[RelayCommand(CanExecute = nameof(CanSave))]
private async Task SaveAsync()
{
// Save logic
}
private bool CanSave() => !string.IsNullOrWhiteSpace(Email);
}
Key Rules
- Single Attribute: Write
[ObservableProperty]inline right before the field declaration - Multiple Attributes: Write other attributes on separate lines, but
[ObservableProperty]is always inline at the end - Purpose: Improve code readability and maintain consistent coding style
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