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                # while(C# 參考) **while** 語句執行一個語句或語句塊,直到指定的表達式計算為 **false**。 ``` class WhileTest { static void Main() { int n = 1; while (n < 6) { Console.WriteLine("Current value of n is {0}", n); n++; } } } /* Output: Current value of n is 1 Current value of n is 2 Current value of n is 3 Current value of n is 4 Current value of n is 5 */ ``` ``` class WhileTest2 { static void Main() { int n = 1; while (n++ < 6) { Console.WriteLine("Current value of n is {0}", n); } } } /* Output: Current value of n is 2 Current value of n is 3 Current value of n is 4 Current value of n is 5 Current value of n is 6 */ ``` 由于 **while** 表達式的測試在每次執行循環前發生,因此 **while** 循環執行零次或更多次。這與執行一次或多次的 [do](https://msdn.microsoft.com/zh-CN/library/370s1zax.aspx) 循環不同。 當 [break](https://msdn.microsoft.com/zh-CN/library/adbctzc4.aspx)、[goto](https://msdn.microsoft.com/zh-CN/library/13940fs2.aspx)、[return](https://msdn.microsoft.com/zh-CN/library/1h3swy84.aspx) 或 [throw](https://msdn.microsoft.com/zh-CN/library/1ah5wsex.aspx) 語句將控制權轉移到 **while** 循環之外時,可以終止該循環。若要將控制權傳遞給下一次迭代但不退出循環,請使用 [continue](https://msdn.microsoft.com/zh-CN/library/923ahwt1.aspx) 語句。請注意,在上面三個示例中,根據 int n 遞增的位置的不同,輸出也不同。在下面的示例中不生成輸出。 ``` class WhileTest3 { static void Main() { int n = 5; while (++n < 6) { Console.WriteLine("Current value of n is {0}", n); } } } ``` ## 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) [While 語句 (C++)](https://msdn.microsoft.com/zh-CN/library/0c98k0ks.aspx) [迭代語句(C# 參考)](https://msdn.microsoft.com/zh-CN/library/32dbftby.aspx)
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