.NET设计模式访问者模式

/// <summary>  
/// 抽象访问者  
/// </summary>  
public abstract class Visitor  
{  
    protected string name { get; set; }  
  
    public Visitor(string name)  
    {  
        this.name = name;  
    }  
  
    public abstract void visitor(MedicineA a);  
  
    public abstract void visitor(MedicineB b);  
} // 何问起 hovertree.com

/// <summary>  
/// 具体访问者：划价员  
/// </summary>  
public class Charger :Visitor  
{  
    public Charger(string name) : base(name) { }  
  
    public override void visitor(MedicineA a)  
    {  
        Console.WriteLine("划价员："+this.name+"给药"+a.GetName()+"价格："+a.GetPrice());  
    }  
  
    public override void visitor(MedicineB b)  
    {  
        Console.WriteLine("划价员：" + this.name + "给药" + b.GetName() + "价格：" + b.GetPrice());  
    }  
}  // 何问起 hovertree.com

/// <summary>  
/// 具体访问者：药房工作者  
/// </summary>  
public class WorkerOfPharmacy:Visitor  
{  
    public WorkerOfPharmacy(string name) : base(name) { }  
    public override void visitor(MedicineA a)  
    {  
        Console.WriteLine("药房工作者："+this.name+"，拿药："+a.GetName());  
    }  
  
    public override void visitor(MedicineB b)  
    {  
        Console.WriteLine("药房工作者：" + this.name + "，拿药：" + b.GetName());  
    }  
} // 何问起 hovertree.com

/// <summary>  
/// 抽象元素：药  
/// </summary>  
public abstract class Medicine  
{  
    protected string name { get; set; }  
    protected double price { get; set; }  
  
    public Medicine(string name, double price)  
    {  
        this.name = name;  
        this.price = price;  
    }  
  
    public string GetName()  
    {  
        return name;  
    }  
  
    public double GetPrice()  
    {  
        return price;  
    }  
  
    public void SetPrice(double price)  
    {  
        this.price = price;  
    }  
  
    public abstract void accept(Visitor visitor);  
}  // 何问起 hovertree.com

/// <summary>  
/// 具体元素：A名称药  
/// </summary>  
public  class MedicineA:Medicine  
{  
    public MedicineA(string name, double price) : base(name, price) { }  
  
    public override void accept(Visitor visitor)  
    {  
        visitor.visitor(this);  
    }  
} // 何问起 hovertree.com

/// <summary>  
/// 具体元素：B名称药  
/// </summary>  
public class MedicineB:Medicine  
{  
    public MedicineB(string name, double price) : base(name, price) { }  
  
    public override void accept(Visitor visitor)  
    {  
        visitor.visitor(this);  
    }  
}  // 何问起 hovertree.com

/// <summary>  
/// 具体元素：药单  
/// </summary>  
public class Presciption  
{  
    private List<Medicine> listmedicine = new List<Medicine>();  
    public void accpet(Visitor visitor)  
    {  
        foreach (var item in listmedicine)  
        {  
            item.accept(visitor);  
        }  
    }  
  
    public void add(Medicine med)  
    {  
        listmedicine.Add(med);  
    }  
  
    public void remove(Medicine med)  
    {  
        listmedicine.Remove(med);  
    }  
}  // 何问起 hovertree.com

/// <summary>  
/// C#设计模式-访问者模式  
/// </summary>  
class Program  
{  
    static void Main(string[] args)  
    {  
        //药类型  
        Medicine a = new MedicineA("药A", 10);  
        MedicineB b = new MedicineB("药B", 20);  
  
        //药单  
        Presciption presciption = new Presciption();  
        presciption.add(a);  
        presciption.add(b);  
  
        Visitor charger = new Charger("张三");    //划价员  
        Visitor workerOfPharmacy = new WorkerOfPharmacy("李四"); //抓药员  
  
        presciption.accpet(charger); //划价  
        Console.WriteLine();  
        presciption.accpet(workerOfPharmacy); //抓药  
    }  
}  // 何问起 hovertree.com