JSON继承JsonConverter序列化与反序列化重写类属性

骑猪看日落 2021-06-26 16:06 374阅读 0赞

1.  首先自定义一个`JSON`类,继承`JsonConverter`,把类的属性重写到`JSON`中.

using System;
        using System.Collections.Generic;
        using System.Linq;
        using System.Text;
        using GongHuiNewtonsoft.Json;
        using GongHuiNewtonsoft.Json.Linq;
         
        namespace JSONDemo
        { 
            public class CustomConverter : JsonConverter
            { 
                private readonly Type[] _types;
         
                public CustomConverter(params Type[] types)
                { 
                    this._types = types;
                }
         
                public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
                { 
                    JToken t = JToken.FromObject(value);
         
                    if (t.Type != JTokenType.Object)
                    { 
                        t.WriteTo(writer);
                    }
                    else
                    { 
                        JObject jo = (JObject)t;
                        IList<string> propertyNameList = jo.Properties().Select(p => p.Name).ToList();
                        jo.AddFirst(new JProperty("Keys", new JArray(propertyNameList)));
                        jo.WriteTo(writer);
                    }
                }
         
                public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
                { 
                    throw new NotImplementedException("Unnecessary because CanRead is false.The type will skip the converter.");
                }
         
                public override bool CanRead
                { 
                    get
                    { 
                        return false;
                    }
                }
         
                public override bool CanConvert(Type objectType)
                { 
                    return _types.Any(t => t == objectType);
                }
            }
        }

1.  定义一个City对象

using System;
        using System.Collections.Generic;
        using System.Linq;
        using System.Text;
         
        namespace JSONDemo
        { 
            public class City
            { 
                public string Country {  get; set; }
                public IList<string> Name {  get; set; }
         
                public City()
                { 
                    this.Name = new List<string> 
                    {  
                        "Auckland",
                        "Wellington",
                        "Hamilton"
                    };
                }
            }
        }

3.序列化与反序列化

using System;
        using System.Collections.Generic;
        using System.Linq;
        using System.Text;
        using System.Data;
        using GongHuiNewtonsoft.Json;
        using GongHuiNewtonsoft.Json.Serialization;
        using GongHuiNewtonsoft.Json.Converters;
         
        namespace JSONDemo
        { 
            class Program
            { 
                static void Main(string[] args)
                { 
                    City city = new City
                    { 
                        Country = "New Zealand"
                    };
         
                    Console.WriteLine("------------自定义序列化添加对象属性------------");
                    string json = JsonConvert.SerializeObject(city, Formatting.Indented, new CustomConverter(typeof(City)));
                    Console.WriteLine(json);
         
                    Console.WriteLine("------------自定义反序列化添加对象属性------------");
                    City newCity = JsonConvert.DeserializeObject<City>(json, new CustomConverter(typeof(City)));
                    Console.WriteLine(newCity.Country);
                    Console.WriteLine(newCity.Name.Count);
                    Console.WriteLine(string.Join("/", newCity.Name.ToArray()));
                }
            }
        }

4.运行的结果,注意:序列化`City`对象时,添加了`Keys`对象的属性,反序列化时属性中的值多添加了一次,使得`Name`属性总数量是`6`.,而不是`3`.  
![在这里插入图片描述][20181013142309769]

[20181013142309769]: /images/20210626/1f31fa3920f04447b6cac94ff160c2e6.png