接口- C# 编程指南| Microsoft Docs
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接口包含非抽象类或结构必须实现的一组相关功能的定义。
An interface contains definitions for a group of related functionalities that a non-abstract class or a struct must implement. 接口可以定义 static 方法,此类方法必须具有实现。
An interface may define static methods, which must have an implementation. 从 C# 8