using Newtonsoft.Json;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace AccpStudentMIS

{

    //此类目的是防治序列化Json字符串时的循环引用问题

    //此类为Object类的扩展方法，需要引用Newtonsoft.Json.dll类

    //使用方法：在Controller中调用 Content(对象.ToJsonString(), "text/html;charset=UTF-8");方法来返回Json

    public static class ObjectExtentions

    {

        public static string ToJsonString(this Object obj)

        {

            JsonSerializerSettings jsSettings = new JsonSerializerSettings();

            jsSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;

            return JsonConvert.SerializeObject(obj, jsSettings);

        }

    }

}

 

 

 记录Newtonsoft在序列成Json时的两个妙用

 

JsonSerializerSettings js = new JsonSerializerSettings();

//1、属性为Null时不做序列化输出

            js.NullValueHandling = NullValueHandling.Ignore;

 

//2、属性为DateTime时,做指定的格式输出

            js.Converters.Add(new IsoDateTimeConverter()

            {

                DateTimeFormat ="yyyy-MM-dd HH:mm:ss"

            });

 

JsonConvert.SerializeObject(obj, Formatting.None, js);

 

 //3、设定某个属性不做json序列化输出（在属性头加[JsonIgnore]）

      [JsonIgnore]

       public string Srl

       {

           get;

           set;

       }

 

 

/// <summary>

        /// 转化为JSON格式

        /// </summary>

        /// <param name="obj"></param>

        /// <param name="depth">RecursionLimit</param>

        /// <returns></returns>

        public static string ToJson(this object obj, int maxDepth = 10)

        {

            JsonSerializerSettings settings = new JsonSerializerSettings();

            //settings.MaxDepth = maxDepth;

            settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;

            settings.Converters.Add(new JavaScriptDateTimeConverter());

            return JsonConvert.SerializeObject(obj, settings);

        }

        public static string ToJsonIsoDateTime(this object obj)

        {

            JsonSerializerSettings settings = new JsonSerializerSettings();

            settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;

            settings.Converters.Add(new IsoDateTimeConverter());

            return JsonConvert.SerializeObject(obj, settings);

        }

        /// <summary>

        /// 将JSON反序列化为对象

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="sJason"></param>

        /// <returns></returns>

        public static T FromJson<T>(this string obj, int maxDepth = 2)

        {

            JsonSerializerSettings settings = new JsonSerializerSettings();

            //settings.MaxDepth = maxDepth;

            settings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;

            settings.Converters.Add(new JavaScriptDateTimeConverter());

            return JsonConvert.DeserializeObject<T>(obj, settings);

        }

        /// <summary>

        /// 将JSON反序列化为对象

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="sJason"></param>

        /// <returns></returns>

        public static T FromJsonIsoDateTime<T>(this string obj)

        {

            return JsonConvert.DeserializeObject<T>(obj, new IsoDateTimeConverter());

        }

 

  /// <summary>

        /// 转化为JSON格式

        /// </summary>

        /// <param name="obj"></param>

        /// <param name="depth">RecursionLimit</param>

        /// <returns></returns>

        public static string ToJson(object obj, int maxDepth = 2)

        {

            return obj.ToJson(maxDepth);

        }

        /// <summary>

        /// 将JSON反序列化为对象

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="sJason"></param>

        /// <returns></returns>

        public static T FromJson<T>(string obj, int maxDepth = 2)

        {

            return obj.FromJson<T>(maxDepth);

        }