C# |跳转语句(中断、继续、转到、返回和抛出)
原文:https://www . geesforgeks . org/c-sharp-jump-statements-break-continue-goto-return-and-throw/
在 C# 中，跳转语句用于在执行程序时，由于某些指定的代码，将控制从程序中的一个点转移到另一个点。跳转语句中有五个关键词:
-
破裂 继续 转到 *返回 *throw
break 语句
break 语句用于终止它所在的循环或语句。之后，控件将传递给 break 语句之后的语句(如果可用)。如果 break 语句出现在嵌套循环中，那么它只终止那些包含 break 语句的循环。
流程图:
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示例:
```cs // C# program to illustrate the // use of break statement using System;
class Geeks {
// Main Method static public void Main() {
// GeeksforGeeks is printed only 2 times // because of break statement for (int i = 1; i < 4; i++) { if (i == 3) break;
Console.WriteLine("GeeksforGeeks"); } } } ```
Output:
```cs GeeksforGeeks GeeksforGeeks
```
连续语句
此语句用于在特定条件下跳过循环的执行部分。之后，它将控制转移到循环的开始。基本上，它跳过下面的语句，继续循环的下一次迭代。
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示例:
```cs // C# program to illustrate the // use of continue statement using System;
class Geeks {
// Main Method public static void Main() {
// This will skip 4 to print for (int i = 1; i <= 10; i++) {
// if the value of i becomes 4 then // it will skip 4 and send the // transfer to the for loop and // continue with 5 if (i == 4) continue;
Console.WriteLine(i); } } } ```
Output:
```cs 1 2 3 5 6 7 8 9 10
```
goto 语句
此语句用于将控制转移到程序中标记的语句。标签是有效的标识符，放在传递控件的语句之前。
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示例:
```cs // C# program to illustrate the // use of goto statement using System;
class Geeks {
// Main Method static public void Main() { int number = 20; switch (number) {
case 5: Console.WriteLine("case 5"); break; case 10: Console.WriteLine("case 10"); break; case 20: Console.WriteLine("case 20");
// goto statement transfer // the control to case 5 goto case 5;
default: Console.WriteLine("No match found"); break; } } } ```
Output:
```cs case 20 case 5
```
返回语句
此语句终止方法的执行，并将控件返回给调用方法。它返回一个可选值。如果方法类型为 void，则可以排除 return 语句。
示例:
```cs // C# program to illustrate the // use of return statement using System;
class Geeks {
// creating simple addition function static int Addition(int a) {
// add two value and // return the result of addition int add = a + a;
// using return statement return add; }
// Main Method static public void Main() { int number = 2;
// calling addition function int result = Addition(number); Console.WriteLine("The addition is {0}", result); } } ```
Output:
```cs The addition is 4
```
抛出语句
这用于借助新的关键字手动创建任何有效异常类的对象。有效的异常必须从异常类派生。
示例:
```cs // C# Program to illustrate the use // of throw keyword using System;
class Geeks {
// takinmg null in the string static string sub = null;
// method to display subject name static void displaysubject(string sub1) { if (sub1 == null) throw new NullReferenceException("Exception Message");
}
// Main Method static void Main(string[] args) {
// using try catch block to // handle the Exception try {
// calling the static method displaysubject(sub); }
catch(Exception exp) { Console.WriteLine(exp.Message ); } }
} ```
Output:
```cs Exception Message
```**
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