不定的多条件的过滤

不定条件的，多条件的过滤删除，显然如果用if...else可以实现可是，现在的要求是实现条件的随意添加，这样的程序，我们怎么样实现灵活的扩展性呢？准备用装饰模式搞一下》代码如下：

定义一个接口：

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

namespace ConsoleApplication1
{
    interface IFilterCondition
    {
        Ware Filter();
    }
}

实现一个条件：

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

namespace ConsoleApplication1
{
    public class FilterCondition : IFilterCondition
    {
        private Ware _ware;
        public FilterCondition(Ware ware)
        {
            this._ware = ware;
        }

        public Ware Filter()
        {
            if (_ware.Wid == 1)
            {
                return _ware;
            }
            return null;
        }


    }
}
 实现第二个条件：

 

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

namespace ConsoleApplication1
{
    public class FilterCondition2:IFilterCondition
    {

        private Ware _ware;
        public FilterCondition2(Ware ware)
        {
            this._ware = ware;
        }

        #region IFilterCondition 成员

        public Ware Filter()
        {
            if (_ware.Wname == "1")
            {
                return _ware;
            }
            return null;
        }

        #endregion
    }
}
要过滤的实体：

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

namespace ConsoleApplication1
{
    public class Ware
    {
        private string wname;

        public string Wname
        {
            get { return wname; }
            set { wname = value; }
        }
        private int wid;

        public int Wid
        {
            get { return wid; }
            set { wid = value; }
        }

    }
}
 接下来要过滤了：

 

            Ware ware = new Ware();
            ware.Wid = 1;
            ware.Wname = "1";
            IFilterCondition filter = new FilterCondition(ware);
            Ware ware3 =  new FilterCondition2(filter.Filter()).Filter();

当然代码还有很多的问题，不满足条件会返回null

相信大家自己能完善吧！