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                # == 運算符(C# 參考) 對于預定義的值類型,如果操作數的值相等,則相等運算符 (**==**) 返回 true,否則返回 **false**。對于 [string](https://msdn.microsoft.com/zh-CN/library/362314fe.aspx) 以外的引用類型,如果兩個操作數引用同一個對象,則 **==** 返回 **true**。對于 **string** 類型,**==** 比較字符串的值。 ## 備注 用戶定義的值類型可重載 **==** 運算符(請參見 [operator](https://msdn.microsoft.com/zh-CN/library/s53ehcz3.aspx))。用戶定義的引用類型也可重載 == 運算符,盡管在默認情況下,無論對于預定義的引用類型還是用戶定義的引用類型,**==** 的行為都與上面描述的相同。如果重載 **==**,則還必須重載 [!=](https://msdn.microsoft.com/zh-CN/library/3tz250sf.aspx)。 對于整數類型適用的運算對枚舉類型通常也適用。 ``` class Equality { static void Main() { // Numeric equality: True Console.WriteLine((2 + 2) == 4); // Reference equality: different objects, // same boxed value: False. object s = 1; object t = 1; Console.WriteLine(s == t); // Define some strings: string a = "hello"; string b = String.Copy(a); string c = "hello"; // Compare string values of a constant and an instance: True Console.WriteLine(a == b); // Compare string references; // a is a constant but b is an instance: False. Console.WriteLine((object)a == (object)b); // Compare string references, both constants // have the same value, so string interning // points to same reference: True. Console.WriteLine((object)a == (object)c); } } /* Output: True False True False True */ ``` ## 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# 運算符](https://msdn.microsoft.com/zh-CN/library/6a71f45d.aspx)
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