铸造和转换有什么区别?

What is the difference between casting and conversion?(铸造和转换有什么区别?)

问题描述

Eric Lippert 在 this question 中的评论让我彻底困惑.C# 中的强制转换和转换有什么区别?

Eric Lippert's comments in this question have left me thoroughly confused. What is the difference between casting and conversion in C#?

推荐答案

我相信 Eric 想说的是:

I believe what Eric is trying to say is:

Casting 是一个描述句法的术语(因此有 句法 的含义).

Casting is a term describing syntax (hence the Syntactic meaning).

转化是一个描述幕后实际采取的行动的术语(因此是语义的含义).

Conversion is a term describing what actions are actually taken behind the scenes (and thus the Semantic meaning).

演员表用于转换对给定的显式表达式输入.

A cast-expression is used to convert explicitly an expression to a given type.

和

(T)E 形式的强制转换表达式，其中 T 是一个类型，E 是一个一元表达式，执行显式E 值的转换(§13.2)键入 T.

A cast-expression of the form (T)E, where T is a type and E is a unary-expression, performs an explicit conversion (§13.2) of the value of E to type T.

似乎通过说语法中的强制转换运算符执行显式转换来支持这一点.

Seems to back that up by saying that a cast operator in the syntax performs an explicit conversion.

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