break

break

1);用于switch case中时跳出switch

2);用在循环中时跳出循环

int age = 0, sum = 0;
int i;
for (i = 0; i < 5;i++ )
{
try
{
Console.WriteLine("请输入第{0}个人岁数", i + 1);
age = Convert.ToInt32(Console.ReadLine());
if (age < 0 || age > 100)
{
Console.WriteLine("不合法");
break;

}
}
catch
{
Console.WriteLine("请输入数字类型");
break;

}

sum += age;

}
if(i<5==false)
{
Console.WriteLine("平均数为{0}", sum / 5);
}

Console.ReadKey();

break

原文：http://www.cnblogs.com/swlq/p/5372721.html