是否有可能:将index增加1，然后在1行代码内换回0 if(index> list.Count)? [英] Is it possible to: increment index by 1 and wrap back to 0 if(index > list.Count) within 1 line of code?

问题描述

我现在正在做什么:

index++;
index %= list.Count;

我想将它们合并为1条快速线，例如:

I want to merge them into 1 quick line, something like:

++index %= list.Count;

但是编译器不允许我这样做.

But the compiler is not allowing me to.

我想知道:

1. 是否可以将这2条合并为1条快速易读的行?
2. 说明为什么我的工作不起作用，IIRC我一直在C/C ++中一直这样做

感谢您的时间！

推荐答案

如果第一个版本在C或C ++中运行，我会有点感到惊讶，但是这确实让我感到惊讶.它在C#中不起作用的原因是％= 运算符的左侧必须是变量，而表达式 ++ index 不是分类为变量-它是一个值.

I'd be slightly surprised if the first version worked in C or C++, but then it does surprise me quite often. The reason it doesn't work in C# is that the left-hand side of the %= operator has to be a variable, and the expression ++index isn't classified as a variable - it's a value.

尽管如此，我还是不会将其称为易于阅读"的行.很容易理解的是:

I wouldn't call it an "easy to read" line anyway though. What is pretty simple to understand is this:

index = (index + 1) % list.Count;

完全不需要复合赋值运算符.

No need for a compound assignment operator at all.

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