有没有像“=+"这样的东西?操作员? [英] Is there such thing as a "=+" operator?

问题描述

我想知道为什么 += 有效而 =+ 无效.假设我有这样的代码:

I'm wondering why is += valid but =+ is not valid. Let's say I have code like this:

string strOne = "World!";
strOne =+ "Hello ";//strOne = "Hello " + strOne; not valid
//Error: Operator '+' cannot be applied to operand of type 'string'
//Intended Output: Hello World!

string strTwo = "Hello ";
strTwo += "World!";//strTwo = strTwo + "World!"; valid
//Output: Hello World!

我也不确定 strOne =+ "Hello "; 是否与 strOne = "Hello " + strOne; 相同.是否有任何关于 =+ 无效或语法不正确的规则?

I'm also not sure whether strOne =+ "Hello "; is same as strOne = "Hello " + strOne;. Are there any rules on why =+ is not valid or cannot be syntactically correct?

推荐答案

简单的答案是否定的，没有 =+ 运算符.你必须这样做

The simple answer is no, there is not a =+ operator. You would have to do

strTwo = "Hello " + strTwo;

不存在的部分原因可能是 + 是数字类型的有效一元运算符.

Part of the reason that there isn't could be that + is a valid unary operator for number types.

var intValue = +2; 

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