System.Array 类提供了许多有用的方法和属性，用于排序、搜索和复制数组。

数组是引用类型，数组作为方法的参数使用时，应注意in、ref、out声明的用法。

第4章  C#语句 32

4.1  使用break语句 33

break 语句用于终止最近的封闭循环或它所在的switch语句。

4.2  使用continue语句 34

continue 语句将控制权传递给它所在的封闭迭代语句的下一次迭代。

4.3  使用do语句 36

do 语句重复执行{}中的一个语句或语句块，直到指定的表达式计算为 false。

4.4  使用foreach语句 37

foreach 语句为数组或对象集合中的每个元素重复一个嵌入语句组。

4.5  使用for语句 39

for 循环重复执行一个语句或语句块，直到指定的表达式计算为 false。

4.6  使用goto语句 40

goto 语句将程序控制直接传递给标记语句。goto的一个通常用法是将控制传递给特定的 switch-case 标签或 switch 语句中的默认标签。

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