声明与定义 [英] Declarations vs definitions

问题描述

在C#中，声明与定义有什么不同，即:

In C# how does a declaration differ from a definition, i.e.:

1. 类声明与类定义
2. 变量声明与定义
3. 方法参数声明与定义

在C ++中，这非常明显，但是在C#中，从ECMA标准和MSDN可以看出，所有内容都是声明，并且在定义中使用单词一词时，它的含义与声明相同.

In C++, this was rather obvious, but in C# from what I can tell from the ECMA standard and MSDN is that everything is a declaration and where the word definition is used, it is used to mean the same thing as declaration.

推荐答案

1. 这种区别不存在.您指的是声明的范围，定义点与变量/字段的范围无关.

1. That distinction does not exist. You are referring to the scope of a declaration, the point of definition is irrelevant to the scope of the variable/field.

int x;  // 'x' is declared
x = 10; // 'x' is assigned


int y = 20; // 'y' is both declared and assigned

那没有什么意义.方法参数在方法签名中声明.

That doesn't make a lot of sense. A method argument is declared in the method signature.

我认为您对1和3中的术语有些困惑.

I think you are a bit confused regarding terminology in 1 and 3.

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