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                # params(C# 參考) 使用 **params** 關鍵字可以指定采用數目可變的參數的[方法參數](https://msdn.microsoft.com/zh-cn/library/8f1hz171.aspx)。 可以發送參數聲明中所指定類型的逗號分隔的參數列表或指定類型的參數數組。還可以不發送參數。如果未發送任何參數,則 **params** 列表的長度為零。 在方法聲明中的 **params** 關鍵字之后不允許任何其他參數,并且在方法聲明中只允許一個 **params** 關鍵字。 下面的示例演示可向 **params** 參數發送參數的各種方法。 ``` public class MyClass { public static void UseParams(params int[] list) { for (int i = 0; i < list.Length; i++) { Console.Write(list[i] + " "); } Console.WriteLine(); } public static void UseParams2(params object[] list) { for (int i = 0; i < list.Length; i++) { Console.Write(list[i] + " "); } Console.WriteLine(); } static void Main() { // You can send a comma-separated list of arguments of the // specified type. UseParams(1, 2, 3, 4); UseParams2(1, 'a', "test"); // A params parameter accepts zero or more arguments. // The following calling statement displays only a blank line. UseParams2(); // An array argument can be passed, as long as the array // type matches the parameter type of the method being called. int[] myIntArray = { 5, 6, 7, 8, 9 }; UseParams(myIntArray); object[] myObjArray = { 2, 'b', "test", "again" }; UseParams2(myObjArray); // The following call causes a compiler error because the object // array cannot be converted into an integer array. //UseParams(myObjArray); // The following call does not cause an error, but the entire // integer array becomes the first element of the params array. UseParams2(myIntArray); } } /* Output: 1 2 3 4 1 a test 5 6 7 8 9 2 b test again System.Int32[] */ ``` ## 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) [方法參數(C# 參考)](https://msdn.microsoft.com/zh-cn/library/8f1hz171.aspx)
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