对象的C#扩展方法 [英] C# Extension Method for Object

问题描述

在Object类上使用扩展方法是一个好主意吗?

Is it a good idea to use an extension method on the Object class?

我想知道是否通过注册此方法是否会导致性能下降，因为它会加载到上下文中加载的每个对象上.

I was wondering if by registering this method if you were incurring a performance penalty as it would be loaded on every object that was loaded in the context.

推荐答案

除了其他答案:

因为扩展方法是编译器功能，所以不会降低性能.考虑以下代码:

there would be no performance penalty because extension methods is compiler feature. Consider following code:

public static class MyExtensions
{
    public static void MyMethod(this object) { ... }
} 

object obj = new object();
obj.MyMethod();

对MyMethod的调用实际上将编译为:

The call to MyMethod will be actually compiled to:

MyExtensions.MyMethod(obj);

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