CLR如何处理C＃中的外部方法调用
[英]How CLR handles extern method calls in C#
问题描述
I want to ask why all extern method calls are static? 
我想问为什么所有外部方法调用都是静态的？ How the CLR handles these calls? CLR如何处理这些呼叫？
2 个解决方案
解决方案1
4 已采纳 2009-03-15 18:33:59
Extern method calls are to unmanaged code. 外部方法调用针对非托管代码。 As such, it doesn't make sense to be called on a (managed) object instance - the first (hidden) argument in an instance method is the instance reference, aka this . 因此，在（托管）对象实例上调用没有意义-实例方法中的第一个（隐藏）参数是实例引用，也就是this 。 Typically, extern methods just involve simple types (primitives, string, etc) - not objects (except perhaps arrays - and even they are often resolved to IntPtr first). 通常， extern方法只涉及简单类型（基元，字符串等），而不涉及对象（也许是数组除外），甚至它们通常通常首先解析为IntPtr 。
解决方案2
2 2009-03-15 23:47:23
extern calls also must generally conform to a "C-style" API, and C doesn't know anything about objects, thus the calls are static . 通常， extern调用也必须符合“ C风格” API，并且C对对象一无所知，因此这些调用是static 。
My statement isn't 100% true as there is a ThisCall calling convention which can be used with [DllImport] as an aid in calling C++ methods. 我的陈述不是100％正确，因为有一个ThisCall调用约定，可以与[DllImport]一起使用来辅助调用C ++方法。
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