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

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---
title: For Loop
localeTitle: 对于循环
---
# 对于循环
`for`循环执行代码块直到指定的条件为false。虽然`for`循环看起来像[`while`循环](https://guide.freecodecamp.org/csharp/while-loop) ,但开发人员应该**正确**使用它们。当迭代次数可变时使用`while`循环,否则使用`for`循环。 `for`循环的常见用途是数组迭代。 1
## 句法
```C#
for ((Initial variable); (condition); (step))
{
(code)
}
```
Cfor循环由三个表达式和一些代码组成。
## 描述
* _初始变量_ 您的起始状态例如int i = 0;
* _条件_ 当此条件为真时代码将继续运行例如i <= 5;
* _步骤_ 初始变量的增量或减量例如i ++或i- = 2。
## 例
```C#
int[] array = { 1, 2, 3, 4, 5 };
for (int i = 0; i < array.Length; i++)
{
Console.WriteLine("Item on index {0} is {1}", i, array[i]);
}
```
## 输出:
```
> Item on index 0 is 1
> Item on index 1 is 2
> Item on index 2 is 3
> Item on index 3 is 4
> Item on index 4 is 5
```
### 来源
1 https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/for