47 lines
		
	
	
		
			1.1 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
			
		
		
	
	
			47 lines
		
	
	
		
			1.1 KiB
		
	
	
	
		
			Markdown
		
	
	
	
	
	
| ---
 | ||
| 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) 
 | ||
|     } 
 | ||
| ```
 | ||
| 
 | ||
| C#for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 |