PresentationBase.Core 3.4.0-preview

Take a look at the Quick start in the wiki. Here are some basic examples:

ViewModels with bindable properties

public class AwesomeViewModel : ViewModel
{
    private string _name;
  
    public string Name
    {
        get => _name;
        set => SetProperty(ref _name, value);
    }
}

... and with property validation

public class AwesomeViewModel : ViewModel
{
    private string _name;

    public string Name
    {
        get => _name;
        set => SetProperty(ref _name, value, NameValidation);
    }

    private IEnumerable<string> NameValidation(string value)
    {
        if (string.IsNullOrEmpty(value))
            yield return "Name cannot be null or empty!";
        else if (value == "sungaila")
            yield return "Name cannot be stupid!";
    }
}

ViewModel collections

public class AwesomeViewModel : ViewModel
{
    public ObservableViewModelCollection<ChildViewModel> Children { get; }
    
    public AwesomeViewModel()
    {
        Children = new ObservableViewModelCollection<ChildViewModel>(this);
        Children.Add(new ChildViewModel { Nickname = "Blinky" });
        Children.Add(new ChildViewModel { Nickname = "Pinky" });
        Children.Add(new ChildViewModel { Nickname = "Inky" });
        Children.Add(new ChildViewModel { Nickname = "Clyde" });
    }
}

Commands

Your command can be defined anywhere you want (as long as its assembly is referenced by the application). Please note that a parameterless constructor (or none at all) is needed.

public class AlertCommand : ViewModelCommand<AwesomeViewModel>
{
    public override void Execute(AwesomeViewModel parameter)
    {
        System.Windows.MessageBox.Show("You just clicked that button.");
    }

    public override bool CanExecute(AwesomeViewModel parameter)
    {
        return parameter.Name != "John Doe";
    }
}

... and async commands

public class AlertCommandAsync : ViewModelCommandAsync<AwesomeViewModel>
{
    protected override async Task ExecutionAsync(AwesomeViewModel parameter)
    {
        await Task.Run(() =>
        {
            System.Threading.Thread.Sleep(2000);
            System.Windows.MessageBox.Show("You clicked that button two seconds ago.");
        });
    }
}