DelegateCommand for MVVM

DelegateCommand.cs

public class DelegateCommand<T> : ICommand where T : class
{
    private readonly Predicate<T> _canExecute;
    private readonly Action<T> _execute;

    public DelegateCommand(Action<T> execute)
        : this(execute, null)
    {
    }

    public DelegateCommand(Action<T> execute, Predicate<T> canExecute)
    {
        _execute = execute;
        _canExecute = canExecute;
    }

    public bool CanExecute(object parameter)
    {
        if (_canExecute == null)
            return true;

        return _canExecute((T)parameter);
    }

    public void Execute(object parameter)
    {
        _execute((T)parameter);
    }

    public event EventHandler CanExecuteChanged;
    public void RaiseCanExecuteChanged()
    {
        CanExecuteChanged?.Invoke(this, EventArgs.Empty);
    }
}