Api中子类继承父类后，子类设置JsonIgnore失效的补救

如

public class Person
{
    public string Name{get;set;}    
    
    public int Age{get;set;}
}

public class Student : Person
{
    public string Grade {get;set;}

    [Newtonsoft.Json.JsonIgnore]
    public new int Age{get;set;}
}

序列化Student，Age还是一样的输出

写一个转换类

using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

    /// <summary>
    /// 继承父类后，设置忽略序列化修补设置
    /// </summary>
    public class JsonIgnoreContractResolver : DefaultContractResolver
    {
        //protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
        //{
        //    JsonProperty property = base.CreateProperty(member, memberSerialization);

        //    //var ignore = property.GetCustomAttributes(typeof(JsonIgnoreAttribute), inherit: false)
        //    //       .OfType<JsonIgnoreAttribute>().SingleOrDefault();

        //    if (member.IsDefined(typeof(JsonIgnoreAttribute)))
        //    {
        //        property.ShouldSerialize = instance => false;
        //    }

        //    return property;
        //}

        protected override List<MemberInfo> GetSerializableMembers(Type objectType)
        {
            //Return properties that do NOT have the JsonIgnoreSerializationAttribute
            return objectType.GetProperties()
                             .Where(pi => !Attribute.IsDefined(pi, typeof(JsonIgnoreAttribute)))
                             .ToList<MemberInfo>();
        }
    }

使用

var settings = new JsonSerializerSettings();
settings.ContractResolver = new JsonIgnoreContractResolver();

指定转换设置，进行操作，就能忽略掉标记了 

[Newtonsoft.Json.JsonIgnore]

的属性