freeCodeCamp/guide/chinese/csharp/foreach/index.md

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---
title: Foreach Loop
localeTitle: Foreach循环
---
## Foreach循环
`foreach`循环为集合中的每个项执行一段代码。 `foreach`循环的好处是你不需要知道集合中有多少项来迭代它;你只需告诉你的`foreach`循环遍历集合只要其中有项目。它对于遍历列表数组数据表IEnumerables和其他类似列表的数据结构非常有用。它可能比设计精良`for`环路效率低,但在大多数情况下差异可以忽略不计。
### 例
```csharp
foreach (element in iterable-item)
{
// body of foreach loop
}
List<string> Names = new List<string>{ "Jim", "Jane", "Jack" }
foreach(string name in Names)
{
Console.WriteLine("We have " + name);
}
```
### 输出:
```sh
> We have Jim
> We have Jane
> We have Jack
```