Exemple #1
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 public abstract void VisitConcreteElementA(ConcreteElementA concreteElementA);
Exemple #2
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 public override void VisitConcreteElementA(ConcreteElementA concreteElementA)
 {
     Console.WriteLine("{0}被{1} 访问", concreteElementA.GetType().Name, this.GetType().Name);
 }