asp.net string装json

 Person p = new Person();
 p.rq1 = (id + 1).ToString();
 p.rq2 = zuhe;
 p.rq3 = fanhui;

 string jsonString = JsonHelper.JsonSerializer<Person>(p);

 public class Person
    {
        public string rq1 { get; set; }
        public string rq2 { get; set; }
        public string rq3 { get; set; }
    }

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JsonHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization.Json;
using System.IO;
using System.Text;


/// <summary>
/// JSON序列化和反序列化辅助类
/// </summary>
public class JsonHelper
{
    /// <summary>
    /// JSON序列化
    /// </summary>
    public static string JsonSerializer<T>(T t)
    {
        DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
        MemoryStream ms = new MemoryStream();
        ser.WriteObject(ms, t);
        string jsonString = Encoding.UTF8.GetString(ms.ToArray());
        ms.Close();
        return jsonString;
    }


    /// <summary>
    /// JSON反序列化
    /// </summary>
    public static T JsonDeserialize<T>(string jsonString)
    {
        DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
        MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
        T obj = (T)ser.ReadObject(ms);
        return obj;
    }
}