C#接口是引用类型,它定义了一个规则,规则规定:实现一个接口的类必须精确地按照该接口的定义来实现该接口的各个方面。接口可以包容方法、C#属性、事件以及索引器-C# interface is a reference type, which defines a rule rule: to achieve an interface class must precisely define the interface according to various aspects of the interface. Interface can accommodate methods, C# properties, events and indexers