匿名内部类在C＃ [英] Anonymous inner classes in C#

问题描述

我是为了加深我对C＃和检票了解编写C＃检票执行的过程。其中一个我们正在运行到的问题是，检票使得大量使用匿名内部类和C＃有没有匿名内部类。

I'm in the process of writing a C# Wicket implementation in order to deepen my understanding of C# and Wicket. One of the issues we're running into is that Wicket makes heavy use of anonymous inner classes, and C# has no anonymous inner classes.

因此​​，例如，在检票，你定义一个链接是这样的：

So, for example, in Wicket, you define a Link like this:

Link link = new Link("id") {
    @Override
    void onClick() {
        setResponsePage(...);
    }
};

由于链接是一个抽象类，它迫使实现者实现一个onClick方法。

Since Link is an abstract class, it forces the implementor to implement an onClick method.

不过，在C＃中，因为没有匿名内部类，有没有办法做到这一点。作为替代方案，你可以使用像这样的活动：

However, in C#, since there are no anonymous inner classes, there is no way to do this. As an alternative, you could use events like this:

var link = new Link("id");
link.Click += (sender, eventArgs) => setResponsePage(...);

当然，也有一对夫妻带着这个缺点。首先，可以有多个点击处理程序，这可能不是很酷。 ，也不会强制实现者添加一个Click处理程序

Of course, there are a couple of drawbacks with this. First of all, there can be multiple Click handlers, which might not be cool. It also does not force the implementor to add a Click handler.

另一个选择可能是只是有一个封闭性是这样的：

Another option might be to just have a closure property like this:

var link = new Link("id");
link.Click = () => setResponsePage(...);

这解决了有很多处理的问题，不过还是不会强制执行者添加的处理程序

This solves the problem of having many handlers, but still doesn't force the implementor to add the handler.

所以，我的问题是，你如何仿效地道的C＃这样的事情？

So, my question is, how do you emulate something like this in idiomatic C#?

推荐答案

您可以委托是连接类的构造函数的一部分。这样，用户将不得不添加它。

You can make the delegate be part of the constructor of the Link class. This way the user will have to add it.

public class Link 
{
    public Link(string id, Action handleStuff) 
    { 
        ...
    }

}

然后创建一个实例是这样的：

Then you create an instance this way:

var link = new Link("id", () => do stuff);

这篇关于匿名内部类在C＃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！