【设计模式】之 Bridge 桥梁模式

最新推荐文章于 2024-03-14 10:07:43 发布

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#设计模式 #string #class #delete

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本文详细介绍了桥梁模式在C#编程中的实现，通过创建抽象类和具体类，展示了如何将业务逻辑与数据操作分离，提高代码的复用性和灵活性。通过实例演示了客户业务对象和数据对象之间的交互，以及如何使用客户数据对象展示和操作客户记录。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace DesignFactory.Bridge
{
    /// <summary>
    /// 桥梁模式
    /// </summary>
    class BridgePattern
    {
    }

    abstract class DataObject
    {
        abstract public void NextRecord();
        abstract public void PriorRecord();
        abstract public void NewRecord(string name);
        abstract public void DeleteRecord(string name);
        abstract public void ShowRecord();
        abstract public void ShowAllRecord();
    }

    class BusinessObject
    {
        protected string group;
        public BusinessObject(string group)
        {
            this.group = group;
        }

        private DataObject dataObject;

        public DataObject DataObject
        {
            get { return dataObject; }
            set { dataObject = value; }
        }

        virtual public void Next()
        {
            dataObject.NextRecord();
        }

        virtual public void Prior()
        {
            dataObject.PriorRecord();
        }

        virtual public void New(string name)
        {
            dataObject.NewRecord(name);
        }

        virtual public void Delete(string name)
        {
            dataObject.DeleteRecord(name);

        }

        virtual public void Show()
        {
            dataObject.ShowRecord();
        }

        virtual public void ShowAll()
        {
            Console.WriteLine("Customer Group:{0}", group);
            dataObject.ShowAllRecord();
        }

    }


    class CustomersBusinessObject : BusinessObject
    {
        public CustomersBusinessObject(string group)
            : base(group)
        { }

        public override void ShowAll()
        {
            Console.WriteLine();
            Console.WriteLine("-----------------");
            base.ShowAll();
            Console.WriteLine("------------------");
        }
    }

    class CustomersDataObject : DataObject
    {
        private ArrayList customers = new ArrayList();
        private int current = 0;
        public CustomersDataObject()
        {
            customers.Add("Jim Jones");
            customers.Add("Samual Jackson");
            customers.Add("Allen Good");
            customers.Add("Ann Stills");
            customers.Add("Lisa Giolani");

        }

        public override void NextRecord()
        {
            if (current <= customers.Count - 1)
            {
                current++;
            }
        }

        public override void PriorRecord()
        {
            if (current > 0)
            {
                current--;
            }
        }

        public override void NewRecord(string name)
        {
            customers.Add(name);
        }

        public override void DeleteRecord(string name)
        {
            customers.Remove(name);
        }

        public override void ShowRecord()
        {
            Console.WriteLine(customers[current]);
        }

        public override void ShowAllRecord()
        {
            foreach (string name in customers)
            {
                Console.WriteLine(" " + name);
            }
        }

    }

    public class BusinessApp
    {
        public static void Main(string[] args)
        {
            CustomersBusinessObject customers = new CustomersBusinessObject("Chicago");
            customers.DataObject = new CustomersDataObject();

            customers.Show();
            customers.Next();
            customers.Show();
            customers.Next();
            customers.Show();
            customers.New("Henry Velasquez");
            customers.ShowAll();
        }
    }


}