Delegate Command

public class DelegateCommand<T> : ICommand
{
    private readonly Action<T> execute;
    private readonly Func<T, bool> canExecute;

    public DelegateCommand(Action<T> execute, Func<T, bool> canExecute = null)
    {
        this.execute = execute;
        this.canExecute = canExecute;
    }

    public bool CanExecute(object parameter)
    {
        return this.canExecute == null || this.canExecute((T)parameter);
    }

    public void Execute(object parameter)
    {
        this.execute((T)parameter);
    }

    public event EventHandler CanExecuteChanged;
}