Programming language: C#
Tags: Mvvm    
Latest version: v5.2.3

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Do you think we are missing an alternative of Smaragd or a related project?

Add another 'MVVM' Package



CI Status NuGet version

This is a very lightweight library containing base classes for implementing .NET applications using the MVVM architecture. It is fully unit tested and platform independent.


Smaragd offers base implementations of key .NET interfaces for building WPF / MVVM applications.

[Core class diagram](./resources/diagram.png)

In addition, it enables developers to:

For more information, please visit the documentation.


The recommended way to use this library is via NuGet.

Currently supported frameworks:

  • .NET Standard 2.0 or higher
  • .NET Framework 4.5 or higher

Quick Start

The following is a simple demonstration of some core features of Smaragd.

  1. Choose a base class for your ViewModel.
  • Inherit from ViewModel if you want to use the fill feature set (recommended)
  • Inherit from Bindable if you only want an implementation of INotifyPropertyChanged and INotifyPropertyChanging

    class AppViewModel : ViewModel
        // ...
  1. Add a property with a backing field that invokes PropertyChanged when set.

    class AppViewModel : ViewModel
            private string _name;
            public string Name
                get => _name;
                set => SetProperty(ref _name, value);
  2. Make the property dependent on the ViewModel's IsDirty property. IsDirty indicates whether property values have changed. The Name property then automatically updates observing views when IsDirty changes.

    class AppViewModel : ViewModel
            private string _name;
            public string Name
                get => IsDirty ? $"{_name} (unsaved changes)" : _name;
                set => SetProperty(ref _name, value);
  3. Add an async command to reset the IsDirty flag.

    class AppViewModel : ViewModel
        private string _name;
        public string Name
            get => IsDirty ? $"{_name} (unsaved changes)" : _name;
            set => SetProperty(ref _name, value);
        private IViewModelCommand<AppViewModel> _saveCommand;
        public IViewModelCommand<AppViewModel> SaveCommand => _saveCommand ??= new SaveCommand(this)
    class SaveCommand : AsyncViewModelCommand<AppViewModel>
        public SaveCommand(AppViewModel context)
            Context = context;
        protected override async Task ExecuteAsync(AppViewModel viewModel, object parameter)
            // SaveChanges(viewModel);
            viewModel.IsDirty = false;
  4. Create a view in XAML for your ViewModel and enjoy working with bindings.

    <Window Title="{Binding Name}">
        <Button Command="{Binding SaveCommand}">

In case you would like to see a more advanced reference application please don't hesitate to visit my other project Stein.

Why another MVVM library?

This library originated in my other project Stein and was subsequently moved to its own repository and nuget package. The goal is to provide a great yet minimal foundation which also promotes a good code style. Nearly everything is marked virtual (except events) so you can customize it to fit your needs.

And of course, this library is 🚀blazing fast🚀.


If you find a bug feel free to open an issue. Contributions are also appreciated.