c# - 如何从此类中的委托(delegate)访问类的实例方法

Question

我们有一个 Command 类，它在构造函数中将一个 Action 作为参数，我们需要从该 Action 访问 Command 类的一些方法。有没有办法实现这一目标？

public class Command
{
    private readonly Action _action;

    public Command(Action action)
    {
        _action = action;
    }

    public void Execute()
    {
        _action();
    }

    public void AnotherMethod()
    {
    }
}

static void Main()
{
    var command = new Command(() =>
                  {
                      // do something

                      // ?? how to access and call 
                      // command.AnotherMethod(); ??

                      // do something else
                   });
    ....
}

Answer 1

public class Command
{
    private readonly Action<Command> _action;

    public Command(Action<Command> action)
    {
        _action = action;
    }

    public void Execute()
    {
        _action(this);
    }

    public void AnotherMethod()
    {
    }
}

static void Main()
{
    var command = new Command(cmd => cmd.AnotherMethod() );
}