goto（C# 参考）
更新：2007 年 11 月
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。
goto 语句还用于跳出深嵌套循环。
示例
下面的示例演示了 goto 在 switch 语句中的使用。
class SwitchTest
{
static void Main()
{
Console.WriteLine("Coffee sizes: 1=Small 2=Medium 3=Large");
Console.Write("Please enter your selection: ");
string s = Console.ReadLine();
int n = int.Parse(s);
int cost = 0;
switch (n)
{
case 1:
cost += 25;
break;
case 2:
cost += 25;
goto case 1;
case 3:
cost += 50;
goto case 1;
default:
Console.WriteLine("Invalid selection.");
break;
}
if (cost != 0)
{
Console.WriteLine("Please insert {0} cents.", cost);
}
Console.WriteLine("Thank you for your business.");
}
}
/*
Sample Input: 2
Sample Output:
Coffee sizes: 1=Small 2=Medium 3=Large
Please enter your selection: 2
Please insert 50 cents.
Thank you for your business.
*/
下面的示例演示了使用 goto 跳出嵌套循环。
public class GotoTest1
{
static void Main()
{
int x = 200, y = 4;
int count = 0;
string[,] array = new string[x, y];
// Initialize the array:
for (int i = 0; i < x; i++)
for (int j = 0; j < y; j++)
array[i, j] = (++count).ToString();
// Read input:
Console.Write("Enter the number to search for: ");
// Input a string:
string myNumber = Console.ReadLine();
// Search:
for (int i = 0; i < x; i++)
{
for (int j = 0; j < y; j++)
{
if (array[i, j].Equals(myNumber))
{
goto Found;
}
}
}
Console.WriteLine("The number {0} was not found.", myNumber);
goto Finish;
Found:
Console.WriteLine("The number {0} is found.", myNumber);
Finish:
Console.WriteLine("End of search.");
}
}
/*
Sample Input: 44
Sample Output
Enter the number to search for: 44
The number 44 is found.
End of search.
*/
C# 语言规范
有关更多信息，请参见 C# 语言规范中的以下各章节：
5.3.3.10 Break、continue 和 goto 语句
8.9.3 goto 语句