C＃类Java类内嵌延期？ [英] C# Java-like inline extension of classes?

问题描述

我想看看这个在谷歌/ MSDN，但我不知道它叫什么，所以我问在这里。

在Java中，我似乎记得你可以这样做很酷的事情，如：

  MyClass类
 {
 INT编号; 
 
 MyClass的（）{} 
 
无效setNumber（INT数）
 {
 this.number =数字; 
} 
} 
  

，然后做一些事情，如：

  MyClass的MyClass的=新MyClass的（）
 {
覆盖无效setNumber（INT编号）
 {
 this.number = 2 *号; 
} 
}; 
  

......什么的。请原谅我上面犯任何错误 - 我还没有真正触及约6年的Java

问题的关键是，我记得你可以伪扩展类的内联<。 / p>

现在，我需要延长一个C＃的WinForms控制，但我只需要使用一次，而修改是非常小的。所有我需要做的是重写的CreateParams 属性和的OnPaint（）处理程序。

我的解决方案是所有的地方已经越来越庞大的带班，这似乎是一个耻辱，包括另一类基本上是相同的标准.NET控件，只是非常轻微的不同的行为。

是否有可能做到这一点的直列扩展在C＃中像您在Java可能吗？如果是这样，怎么样？ （什么叫这样我就可以看看它的MSDN？）

解决方案

这（明确的主格匿名类型）不可能在C＃中四分之三。

类型必须明确创建，然后构建。任务会被倒在C＃中的使用事件和委托（类调用事件，提供实施，如NeedDataSource」）之 - 的可以说正因为如此，虽然它很有道理在许多情况下

如果有可能创建明确的非主格类型：变种x =新{P = 1，}; ，但只在局部范围。隐式的方法包括委托/ lambda表达式/匿名函数，并不适用于此。

编码愉快。

I would look this up on Google/MSDN, but I have no idea what it's called so I'm asking here.

In Java, I seem to remember you can do this really cool thing like:

Class MyClass
{
  int number;

  MyClass() { }

  void setNumber(int number)
  {
    this.number = number;
  }
}

and then do something like:

MyClass myClass = new MyClass()
  {
    override void setNumber(int Number)
    {
      this.number = 2 * number;
    }
  };

...or something. Forgive any mistakes I made above - I haven't actually touched Java in about 6 years.

The point is, I remember you could pseudo-extend a class inline.

Right now, I need to extend a C# WinForms control, but I only need to use it once, and the modifications are very minor. All I need to do is to override the CreateParams property and OnPaint() handler.

My solution is already getting huge with classes all over the place, it seems like a shame to include yet another class which is basically identical to a standard .Net control, just with very slightly different behaviour.

Is it possible to do this inline-extension in C# like you could in Java? If so, how? (and what is it called so I can look it up on MSDN?)

解决方案

This (explicit nominative anonymous types) is not possible in C#3/4.

The types must be created explicitly and then constructed. Tasks are sometimes "inverted" in C# with the use of Events and Delegates (class invokes Event which supplies implementation such as "NeedDataSource") -- arguably because of this, although it just makes sense in many cases.

If is possible to create explicit non-nominative types: var x = new { P = 1, }; but only in a local scope. Implicit methods include delegates/lambdas/anonymous functions and do not apply here.

Happy coding.

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