通过给定DLL创建扩展方法 [英] Create an extension method by given a DLL

问题描述

说我从第三方获得了一个dll。它只有一个方法

Say I get a dll from a third party. It only has one method

DisplayMethod(string result)

现在我想添加一个新方法 PrintMethod（字符串结果）但它无法获取dll的源代码。

所以我想我必须为它生成一个扩展方法。但是怎么样？



我尝试了什么：



我知道怎么做从头开始创建扩展方法。但不确定如何通过给定的dll来做到这一点。需要代码示例。谢谢

Now I want to add a new method PrintMethod(string result)to it but I can't get the dll's source code.
So I guess that I have to generate an extension method to it. But how?

What I have tried:

I know how to create an extension method from the scratch. But not sure how to do it by given dll. Need code example. Thanks

推荐答案

扩展方法适用于类型，而不是.DLL。扩展添加适用于类型的功能，如整数或字符串。



没有必要在.DLL中添加扩展名。您的代码无法将其转换为.DLL文件本身，因此您只需创建一个新的.DLL，它将与文件系统中现有的一致.DLL。你刚刚创建了一个新的类库项目，它将编译成另一个.DLL。



现在，这个新方法会做什么？您是否尝试更换DisplayMethod功能？原始方法是否可以覆盖？

Extension methods apply to types, not .DLL's. Extensions add functionality applicable to a type, like an integer or string.

There is no point to adding an "extension" to a .DLL. Your code cannot make it into the .DLL file itself, so you're just making a new .DLL that would be along side of the existing one in the file system. You're just making a new class library project which will compile into another .DLL.

Now, what would this new method do? Are you trying to replace the DisplayMethod functionality? Is the original method overridable?

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