C# goto 语句

参考：https://msdn.microsoft.com/zh-cn/library/13940fs2.aspx

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。

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.");            // Keep the console open in debug mode.            Console.WriteLine("Press any key to exit.");            Console.ReadKey();        }    }    /*    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.");        // Keep the console open in debug mode.        Console.WriteLine("Press any key to exit.");        Console.ReadKey();    }}/*Sample Input: 44Sample OutputEnter the number to search for: 44The number 44 is found.End of search.*/