如何创建原型方法（如JavaScript）的C＃.NET？ [英] How can I create Prototype Methods (like JavaScript) in C#.Net?

问题描述

这怎么可能做出原型方法，C＃.NET？

How is it possible to make prototype methods in C#.Net?

在JavaScript中，我可以执行以下操作来为string对象创建修剪方法：

In JavaScript, I can do the following to create a trim method for the string object:

String.prototype.trim = function() {
    return this.replace(/^\s+|\s+$/g,"");
}

我如何去用C＃.net这样做呢？

How can I go about doing this in C#.Net?

推荐答案

您不能动态地添加方法将现有对象或类.NET，除非改变源为类。

You can't dynamically add methods to existing objects or classes in .NET, except by changing the source for that class.

然而，你可以，在C＃3.0中，使用扩展方法，其中的看的像新的方法，但编译时的法宝。

You can, however, in C# 3.0, use extension methods, which look like new methods, but are compile-time magic.

要为你的code做到这一点：

To do this for your code:

public static class StringExtensions
{
    public static String trim(this String s)
    {
        return s.Trim();
    }
}

要使用它：

String s = "  Test  ";
s = s.trim();

这看起来像是一种新的方法，但将编译完全相同的方式，因为这code：

This looks like a new method, but will compile the exact same way as this code:

String s = "  Test  ";
s = StringExtensions.trim(s);

究竟是什么你要完成？也许还有做你想要什么更好的办法？

What exactly are you trying to accomplish? Perhaps there are better ways of doing what you want?

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