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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                # 編譯器錯誤 CS1721 類“class”不能有多個基類:“class_1”和“class_2” 導致此錯誤的最常見的原因是嘗試使用多重繼承。 C# 中的類只能從一個類直接繼承。 但是,類可以實現任意數量的接口。 ## 示例 <a id="exampleToggle"></a> 下面的示例演示生成 SC1721 的一種方式,然后演示避免該錯誤的兩種可行方法。 ``` // CS1721.cs public class A {} public class B {} public class MyClass : A, B {} // CS1721 // One possible fix is to use the following approach instead: public class A {} public class B : A {} public class C : B {} // Another possible fix is to use interfaces instead of base classes: public class A {} public interface B {} public class C : A, B {} ``` ## 請參見 <a id="seeAlsoToggle"></a> #### 參考 [多態性(C# 編程指南)](https://msdn.microsoft.com/zh-cn/library/ms173152.aspx) [接口(C# 編程指南)](https://msdn.microsoft.com/zh-cn/library/ms173156.aspx)
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