[转][C#]c# 将JSON转化为list实体类，将list实体类转化为JSON字符串

原文地址：http://wo13145219.iteye.com/blog/2022667

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Text;
using System.Runtime.Serialization.Json;
using System.Collections.Generic;
using System.Reflection;
using System.Web.Script.Serialization;

namespace AjaxTest
{
    public partial class Json : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            //Response.Write(getJsonInfo());
            //string strReg = "\\\\";
            //strReg = strReg.Replace("\\\\", "\\");
            ////Response.Write(strReg);
            //方法一
            Response.Write(disJsonInfo(getObjectByJson(getJsonInfo())));      //方法二
            Response.Write(JsonInfo.getInfo());

        }

        /// <summary>
        /// 获取将实体类转换为json数据（目的是为了更快在网页上传递数据）
        /// </summary>
        /// <returns></returns>
        public string getJsonInfo()
        {
            UserInfo userInfo = new UserInfo();
            //userInfo.strNameInfo = "张三";
            //userInfo.intAgeInfo = 23;
            //userInfo.intTelInfo = 66666;
            //userInfo.strAddrInfo = "北京市";
            //userInfo.strPasswordInfo = "yhx.123";
            userInfo.strName = "张三";
            userInfo.intAge = 23;
            userInfo.strPsd = "yhx.123";
            userInfo.intTel = 2324;
            userInfo.strAddr = "北京市";
            //将对象序列化json
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(UserInfo));
            //创建存储区为内存流
            System.IO.MemoryStream ms = new MemoryStream();
            //将json字符串写入内存流中
            serializer.WriteObject(ms, userInfo);
            System.IO.StreamReader reader = new StreamReader(ms);
            ms.Position = 0;
            string strRes = reader.ReadToEnd();
            reader.Close();
            ms.Close();
            return strRes;
        }

        /// <summary>
        /// 将json数据转换成实体类
        /// </summary>
        /// <returns></returns>
        private static List<UserInfo> getObjectByJson(string jsonString)
        {
            // 实例化DataContractJsonSerializer对象，需要待序列化的对象类型
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(List<UserInfo>));
            //把Json传入内存流中保存
            jsonString = "[" + jsonString + "]";
            MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
            // 使用ReadObject方法反序列化成对象
            object ob = serializer.ReadObject(stream);
            List<UserInfo> ls = (List<UserInfo>)ob;
            return ls;
        }

        /// <summary>
        /// 在页面上显示转换为实体类数据
        /// </summary>
        private string  disJsonInfo(List<UserInfo> us)
        {
            string strItem = "";
            foreach(var item in us )
            {
                strItem += item.strName + ":" + item.strPsd + ":" + item.intAge + ":" + item.intTel + ":" + item.strAddr + "<br/>";
            }
            return strItem;
        }
    }

    /// <summary>
    /// 用户实体类
    /// </summary>
    public class UserInfo
    {
        //用户名
        public string strName { get; set; }
        //年龄
        public int intAge { get; set; }
        //密码
        public string strPsd { get; set; }
        //电话号码
        public int intTel { get; set; }
        //地址
        public string strAddr { get; set; }
    }

    /// <summary>
    /// 将json数据转换成实体类（方法二）
    /// </summary>
    public static class JsonInfo
    {
        /// <summary>
        /// 获取将实体类转换为json数据（目的是为了更快在网页上传递数据）
        /// </summary>
        /// <returns></returns>
        public static string getJsonInfo()
        {
            UserInfo userInfo = new UserInfo();
            userInfo.strName = "张三";
            userInfo.intAge = 23;
            userInfo.strPsd = "yhx.123";
            userInfo.intTel = 2324;
            userInfo.strAddr = "北京市";
            //将对象序列化json
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(UserInfo));
            //创建存储区为内存流
            System.IO.MemoryStream ms = new MemoryStream();
            //将json字符串写入内存流中
            serializer.WriteObject(ms, userInfo);
            System.IO.StreamReader reader = new StreamReader(ms);
            ms.Position = 0;
            string strRes = reader.ReadToEnd();
            reader.Close();
            ms.Close();
            return strRes;
        }

        /// <summary>
        ///
        /// </summary>
        /// <returns></returns>
        public static string getInfo()
        {
            string JsonStr = "["+getJsonInfo()+"]";
            List<UserInfo> products;

            products = JsonInfo.JSONStringToList<UserInfo>(JsonStr);

            string strItem = "";
            foreach (var item in products)
            {
                strItem += item.strName + ":" + item.strPsd + ":" + item.intAge + ":" + item.intTel + ":" + item.strAddr + "<br/>";
            }
            return strItem;
        }

        /// <summary>
        /// 返回List集合对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="JsonStr"></param>
        /// <returns></returns>
        public static List<T> JSONStringToList<T>(this string JsonStr)
        {

            JavaScriptSerializer Serializer = new JavaScriptSerializer();

            List<T> objs = Serializer.Deserialize<List<T>>(JsonStr);
            return objs;

        }

        /// <summary>
        ///
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="json"></param>
        /// <returns></returns>
        public static T Deserialize<T>(string json)
        {

            T obj = Activator.CreateInstance<T>();

            using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json)))
            {

                DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());

                return (T)serializer.ReadObject(ms);

            }

        }
    }
}