goto（C# 參考） · MSDN C# 編程指南 & 參考手冊 2015

# goto（C# 參考） **goto** 語句將程序控制直接傳遞給標記語句。 **goto** 的一個通常用法是將控制傳遞給特定的 switch-case 標簽或 **switch** 語句中的默認標簽。 **goto** 語句還用于跳出深嵌套循環。下面的示例演示了 **goto** 在 [switch](https://msdn.microsoft.com/zh-CN/library/06tc147t.aspx) 語句中的使用。 ``` 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** 跳出嵌套循環。 ``` 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: 44 Sample Output Enter the number to search for: 44 The number 44 is found. End of search. */ ``` ## C# 語言規范有關詳細信息，請參閱 [C# 語言規范](https://msdn.microsoft.com/zh-CN/library/ms228593.aspx)。該語言規范是 C# 語法和用法的權威資料。 ## 請參閱 [C# 參考](https://msdn.microsoft.com/zh-CN/library/618ayhy6.aspx) [C# 編程指南](https://msdn.microsoft.com/zh-CN/library/67ef8sbd.aspx) [C# 關鍵字](https://msdn.microsoft.com/zh-CN/library/x53a06bb.aspx) [goto 語句 (C++)](https://msdn.microsoft.com/zh-CN/library/b34dt9cd.aspx) [跳轉語句（C# 參考）](https://msdn.microsoft.com/zh-CN/library/d96yfwee.aspx)