设计模式(C#)之享元模式(Flyweight Pattern)

设计模式(C#)之享元模式(Flyweight Pattern)

代码下载

1.概念

运用共享技术有效地支持大量细粒度的对象。

2.类图

Model.cs

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

namespace FlyweightPattern
{
    public class Model
    {
        public double D1
        {
            get;
            set;
        }

        public double D2
        {
            get;
            set;
        }
    }
}

AbstractSum.cs

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

namespace FlyweightPattern
{
    public abstract class AbstractSum
    {
        public abstract double Sum(Model md);
       
    }
}

Sum1.cs

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

namespace FlyweightPattern
{
    public class Sum1 : AbstractSum
    {
        public override double Sum(Model md)
        {
            return md.D1 + md.D2;
        }
    }
}

Sum2.cs

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

namespace FlyweightPattern
{
    public class Sum2 : AbstractSum
    {
        public override double Sum(Model md)
        {
            return md.D1 * md.D2;
        }
    }
}

FlyweightUse.cs

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

namespace FlyweightPattern
{
    public class FlyweightUse
    {
       
        private Dictionary<string, AbstractSum> _sumObjects = new Dictionary<string, AbstractSum>();
        public AbstractSum GetSumObject(string key)
        {
            AbstractSum SumObject = null;

            if (_sumObjects.ContainsKey(key))
            {
                SumObject = _sumObjects[key];
            }
            else
            {
                switch (key)
                {
                    case "Sum1": SumObject = new Sum1(); break;
                    case "Sum2": SumObject = new Sum2(); break;
                }

                _sumObjects.Add(key, SumObject);
            }

            return SumObject;
        }

    }
}

3.调用

代码下载