为什么C#不让您使用var声明多个变量? [英] Why doesn't C# let you declare multiple variables using var?

问题描述

提供以下信息:

// not a problem
int i = 2, j = 3;

这让我感到惊讶:

// compiler error: Implicitly-typed local variables cannot have multiple declarators
var i = 2, j = 3;

不会编译.也许对此我有些不了解(这就是为什么我要问这个问题)?

doesn't compile. Maybe there is something I don't understand about this (which is why I'm asking this)?

但是为什么编译器不会意识到我的意思:

But why wouldn't the compiler realize that I meant:

var i = 2;
var j = 3;

将进行编译.

推荐答案

对于程序员和编译器而言，这只是可能造成混淆的另一点.

It's just another point of possible confusion for the programmer and the compiler.

例如，这很好:

double i = 2, j = 3.4;

但这是什么意思?

var i = 2, j = 3.4;

使用语法糖，这种事情是没人需要的头痛-因此，我怀疑您的情况是否会得到支持.它涉及到太多的编译器，以至于变得过于聪明.

With syntactic sugar this kind of thing is a headache no one needs--so I doubt your case would ever be supported. It involves too much of the compiler trying to be a little bit too clever.

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