Newtonsoft.Json JsonHelper

  1 using System;
  2 using System.Linq;
  3 using Newtonsoft.Json;
  4 using Newtonsoft.Json.Serialization;
  5 using System.Collections.Generic;
  6 
  7 namespace TT.Utilities.Json
  8 {
  9     public static class JsonHelper
 10     {
 11         /// <summary>
 12         /// 只序列号需要的字段
 13         /// </summary>
 14         /// <param name="obj"></param>
 15         /// <param name="arrFiled"></param>
 16         /// <returns></returns>
 17         public static string GetPartModelJson(object obj, string[] arrFiled)
 18         {
 19             JsonSerializerSettings jsetting = new JsonSerializerSettings();
 20             jsetting.ContractResolver = new LimitPropsContractResolver(arrFiled);
 21             return JsonConvert.SerializeObject(obj, Formatting.Indented, jsetting);
 22         }
 23 
 24         /// <summary>
 25         /// 转换成json格式
 26         /// </summary>
 27         /// <param name="obj">对象</param>
 28         /// <returns></returns>
 29         public static string GetJson(object obj)
 30         {
 31             return JsonConvert.SerializeObject(obj);
 32         }
 33 
 34         /// <summary>
 35         /// json格式字符串转化成T类型对象
 36         /// </summary>
 37         /// <typeparam name="T">类型</typeparam>
 38         /// <param name="json">json字符串</param>
 39         /// <returns></returns>
 40         public static T GetModel<T>(string json)
 41         {
 42             return JsonConvert.DeserializeObject<T>(json);
 43         }
 44 
 45         /// <summary>
 46         /// 反序列化成json属性
 47         /// </summary>
 48         /// <param name="json">json字符串</param>
 49         /// <returns></returns>
 50         public static Newtonsoft.Json.Linq.JProperty DeserialJson(string json)
 51         {
 52             return JsonConvert.DeserializeObject<Newtonsoft.Json.Linq.JProperty>(json);
 53         }
 54 
 55         /// <summary>
 56         /// 反序列化JSON到给定的匿名对象.
 57         /// </summary>
 58         /// <typeparam name="T">匿名对象类型</typeparam>
 59         /// <param name="json">json字符串</param>
 60         /// <param name="anonymousTypeObject">匿名对象</param>
 61         /// 调用:var objClass = JsonClass.DeserializeAnonymousType(obj.Data.ToString(), nClass[匿名对象]);
 62         /// <returns>匿名对象</returns>
 63         public static T DeserializeAnonymousType<T>(string json, T anonymousTypeObject)
 64         {
 65             T t = JsonConvert.DeserializeAnonymousType(json, anonymousTypeObject);
 66             return t;
 67         }
 68 
 69         public class LimitPropsContractResolver : DefaultContractResolver
 70         {
 71             string[] props = null;
 72 
 73             bool retain;
 74 
 75             /// <summary>
 76             /// 构造函数
 77             /// </summary>
 78             /// <param name="props">传入的属性数组</param>
 79             /// <param name="retain">true:表示props是需要保留的字段  false:表示props是要排除的字段</param>
 80             public LimitPropsContractResolver(string[] props, bool retain = true)
 81             {
 82                 //指定要序列化属性的清单
 83                 this.props = props;
 84 
 85                 this.retain = retain;
 86             }
 87 
 88             protected override IList<JsonProperty> CreateProperties(Type type,
 89 
 90             MemberSerialization memberSerialization)
 91             {
 92                 IList<JsonProperty> list =
 93                 base.CreateProperties(type, memberSerialization);
 94                 //只保留清单有列出的属性
 95                 return list.Where(p =>
 96                 {
 97                     if (retain)
 98                     {
 99                         return props.Contains(p.PropertyName);
100                     }
101                     else
102                     {
103                         return !props.Contains(p.PropertyName);
104                     }
105                 }).ToList();
106             }
107         }
108     }
109 }

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