for 和 foreach 有什么区别? [英] What is the difference between for and foreach?

问题描述

for 和 foreach 循环之间的主要区别是什么?

在哪些情况下我们可以使用 for 而不是 foreach，反之亦然.

是否可以用一个简单的程序来展示?

在我看来两者都一样.我无法区分它们.

解决方案

for 循环是一种结构，表示执行此操作 n. 次".

foreach 循环是一种结构，表示对这个 IEnumerable 中的 每个 值/对象执行此操作"

What is the major difference between for and foreach loops?

In which scenarios can we use for and not foreach and vice versa.

Would it be possible to show with a simple program?

Both seem the same to me. I can't differentiate them.

解决方案

a for loop is a construct that says "perform this operation n. times".

a foreach loop is a construct that says "perform this operation against each value/object in this IEnumerable"

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