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47 lines
1.2 KiB
Markdown
47 lines
1.2 KiB
Markdown
---
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title: For Loop
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localeTitle: 对于循环
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---
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# 对于循环
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`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
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## 句法
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```csharp
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for ((Initial variable); (condition); (step))
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{
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(code)
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}
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```
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C＃for循环由三个表达式和一些代码组成。
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## 描述
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* _初始变量_ ：您的起始状态，例如int i = 0;
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* _条件_ ：当此条件为真时，代码将继续运行，例如i <= 5;
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* _步骤_ ：初始变量的增量或减量，例如i ++或i- = 2。
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## 例
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```csharp
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int[] array = { 1, 2, 3, 4, 5 };
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for (int i = 0; i < array.Length; i++)
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{
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Console.WriteLine("Item on index {0} is {1}", i, array[i]);
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}
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```
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## 输出：
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```
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> Item on index 0 is 1
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> Item on index 1 is 2
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> Item on index 2 is 3
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> Item on index 3 is 4
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> Item on index 4 is 5
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```
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### 来源
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1 https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/for |