List 实现IList接口

1 知识点:
  1.1 List<T> 实现IList接口
  1.2 System.Reflection 反射

2 举例及实现(调试OK)

 

using System;

using System.Text;

using System.Reflection;

using System.Collections;

using System.Collections.Generic;



namespace ConsoleApplication1

{

    public class Node

    {

        private int _id;

        private int _pid;

        private string _name;



        public Node() { }



        public Node(int id, int pid, string name)

        {

            _id = id;

            _pid = pid;

            _name = name;

        }



        public int ID

        {

            get { return _id; }

            set { _id = value; }

        }



        public int PID

        {

            get { return _pid; }

            set { _pid = value; }

        }



        public string Name

        {

            get { return _name; }

            set { _name = value; }

        }



        public override string ToString()

        {

            return "ID:" + _id + "\t" + "PID:" + _pid + "\t" + "Name:" + _name;

        }

    }



    class B

    {

        private object _dataSource;

        public object DataSource

        {

            get { return _dataSource; }

            set { _dataSource = value; }

        }



        //怎么遍历DataSource，取出ID,PID,Name属性值？

        public void RecursionList()

        {

            if (this._dataSource == null) return;

            if (!(this._dataSource is IList)) return;



            IList nodeList = (IList)this._dataSource;//知识点1

            PropertyInfo[] props = nodeList[0].GetType().GetProperties();//知识点2

            foreach (object node in nodeList)

            {

                foreach (System.Reflection.PropertyInfo prop in props)

                {

                    object propValue = prop.GetValue(node, null);//知识点2

                    Console.WriteLine(string.Format("{0} = {1}", prop.Name, propValue));

                }

            }

        }

    }



    //应用举例

    class Program

    {

        static void Main(string[] args)

        {

            List<Node> listTree = new List<Node>();

            listTree.Add(new Node(0, 1, "北京"));

            listTree.Add(new Node(1, -1, "中国"));

            listTree.Add(new Node(2, 6, "莫斯科"));

            listTree.Add(new Node(3, 0, "海淀区"));

            listTree.Add(new Node(4, 0, "朝阳区"));

            listTree.Add(new Node(5, 3, "上地"));

            listTree.Add(new Node(6, -1, "俄罗斯"));

            listTree.Add(new Node(8, -1, "美国"));



            B newB = new B();

            newB.DataSource = listTree;

            newB.RecursionList();



            Console.Read();

        }

    }

}

再更进一步:
当然,this._dataSource 可能不一定可迭待的
所以如下修改更完善

//怎么遍历DataSource，取出ID,PID,Name属性值？

        public void RecursionList()

        {

            if (this._dataSource == null) return;

            if (this._dataSource is IEnumerable)

            {

               IEnumerable nodeList = (IEnumerable)this._dataSource;

               foreach (object node in nodeList)

               {

                 PropertyInfo[] props = node.GetType().GetProperties();

                 foreach (System.Reflection.PropertyInfo prop in props)

                 {

                    object propValue = prop.GetValue(node, null);

                    Console.WriteLine(string.Format("{0} = {1}", prop.Name, propValue));

                 }

               }

            } 

            else if (this._dataSource is IEnumerable)//其他类型呢?

            {

              ... 此时,你想到什么呢?什么要做可使扩展性更好呢?

            }

        }