C# Json序列化和反序列化辅助类(官方DLL)

方法一：

①添加DLL

Newtonsoft.Json.dll

②添加命名空间

using Newtonsoft.Json;

③应用

序列化

JsonConvert.SerializeObject(user);

方法二：

①添加DLL

System.Web.Extensions.dll

②添加引用

using System.Web.Script.Serialization;

③应用

List<User> list = new List<User>();
list.Add(new User("张", "123"));
list.Add(new User("王", "456"));
list.Add(new User("李", "789"));
JavaScriptSerializer serializer = new JavaScriptSerializer();
string str = serializer.Serialize(list);
Console.Write(str);
Console.Read();

方法三：

添加DLL引用：

System.Runtime.Serialization.dll

using System.Runtime.Serialization.Json;

System.Web.Extensions.dll

using System.Web.Script.Serialization;

工具类代码：

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
using System.Runtime.Serialization.Json;//在System.Runtime.Serialization.dll中
using System.Web.Script.Serialization; //在System.Web.Extensions.dll中
namespace Util
{
  /// <summary>
  /// Json序列化和反序列化辅助类
  /// </summary>
  public class JsonHelper
  {
    /// <summary>
    /// Json序列化
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="obj">对象实例</param>
    /// <returns>json字符串</returns>
    public static string JsonSerializer<T>(T obj)
    {
      string jsonString = string.Empty;
      try
      {
        DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));


        using (MemoryStream ms = new MemoryStream())
        {
          serializer.WriteObject(ms, obj);
          jsonString = Encoding.UTF8.GetString(ms.ToArray());
        }
      }
      catch
      {
        jsonString = string.Empty;
      }
      return jsonString;
    }


    /// <summary>
    /// Json反序列化
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="jsonString">json字符串</param>
    /// <returns>对象实例</returns>
    public static T JsonDeserialize<T>(string jsonString)
    {
      T obj = Activator.CreateInstance<T>();
      try
      {
        using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))
        {
          DataContractJsonSerializer ser = new DataContractJsonSerializer(obj.GetType());//typeof(T)
          T jsonObject = (T)ser.ReadObject(ms);
          ms.Close();


          return jsonObject;
        }
      }
      catch
      {
        return default(T);
      }
    }


    /// <summary>
    /// 将 DataTable 序列化成 json 字符串
    /// </summary>
    /// <param name="dt">DataTable对象</param>
    /// <returns>json 字符串</returns>
    public static string DataTableToJson(DataTable dt)
    {
      if (dt == null || dt.Rows.Count == 0)
      {
        return "\"\"";
      }
      JavaScriptSerializer myJson = new JavaScriptSerializer();


      List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();


      foreach (DataRow dr in dt.Rows)
      {
        Dictionary<string, object> result = new Dictionary<string, object>();
        foreach (DataColumn dc in dt.Columns)
        {
          result.Add(dc.ColumnName, dr[dc].ToString());
        }
        list.Add(result);
      }
      return myJson.Serialize(list);
    }


    /// <summary>
    /// 将对象序列化成 json 字符串
    /// </summary>
    /// <param name="obj">对象实例</param>
    /// <returns>json 字符串</returns>
    public static string ObjectToJson(object obj)
    {
      if (obj == null)
      {
        return string.Empty;
      }
      JavaScriptSerializer myJson = new JavaScriptSerializer();


      return myJson.Serialize(obj);
    }


    /// <summary>
    /// 将 json 字符串反序列化成对象
    /// </summary>
    /// <param name="json">json字符串</param>
    /// <returns>对象实例</returns>
    public static object JsonToObject(string json)
    {
      if (string.IsNullOrEmpty(json))
      {
        return null;
      }
      JavaScriptSerializer myJson = new JavaScriptSerializer();


      return myJson.DeserializeObject(json);
    }


    /// <summary>
    /// 将 json 字符串反序列化成对象
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="json">json字符串</param>
    /// <returns>对象实例</returns>
    public static T JsonToObject<T>(string json)
    {
      if (string.IsNullOrEmpty(json))
      {
        return default(T);
      }
      JavaScriptSerializer myJson = new JavaScriptSerializer();


      return myJson.Deserialize<T>(json);
    }
  }
}