C# break声明

break语句终止它出现的封闭循环或switch语句。控件将传递给循环或开关块之后的语句。

在第一个例子中，当i的值为3时，执行break语句，这导致循环的执行被终止。

例

int[] array = { 1, 2, 3, 4, 5 };
 for (int i = 0; i < array.Length; i++)
 {
  if(i == 3)
  {
    break;
  }
    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

在第二个示例中，每个案例的末尾都包含一个break语句。这将执行案例中的语句，而不会继续下一个案例。如果没有break语句，程序将继续执行下一个案例，并且不会按预期运行。

例

switch (exampleVariable)
 {
    case 1:
        Console.WriteLine("case 1");
        Console.WriteLine("This only shows in example 1");
        break;
    case 2:
        Console.WriteLine("case 2");
        Console.WriteLine("This only shows in example 2");
    Console.WriteLine("This also only shows in example 2");
        break;
    Console.WriteLine("This would not show anywhere, as it is after the break line and before the next case");
    default:
        Console.WriteLine("default");
        Console.WriteLine("This only shows in the Default Example");
        break;
 }

输出：

> case 1
 > This only shows in example 1
 >
 > case  2
 > This only shows in example 2
 > This also only shows in example 2
 >
 > default
 > This only shows in the Default Example
 >

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