Пример #1
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 public override void VisitConcreteElementB(ConcreteElementB concreteElementB)
 {
     Console.WriteLine($"{concreteElementB.GetType().Name}被{this.GetType().Name}访问");
 }
Пример #2
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 public override void Visit(ConcreteElementB elementB)
 {
     //元素B的代码
 }
Пример #3
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 public abstract void VisitConcreteElementB(ConcreteElementB concreteElementB);
Пример #4
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 public abstract void Visit(ConcreteElementB elementB);