List<T> 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?
            }
        }