从 json 序列化对象中删除空字符串属性

我有课。它有几个属性，假设有 10 个。在这 10 个属性中，3 个填充了数据，其余 7 个为空白。即空字符串 "" 使用了这个link https://stackoverflow.com/questions/15574506/how-to-remove-null-value-in-json-string作为参考。我只想显示非空和非空字符串属性。但最终输出具有全部 10 个属性。我只想看3.

namespace Mynamespace.ValueObjects
{
[DataContract]
public class User
{
      [DataMember(Name ="userID", IsRequired = false,EmitDefaultValue = false)]
    public string userID { get; set; }
      [DataMember(Name ="ssn", IsRequired = false,EmitDefaultValue = false)]
    public string ssn { get; set; }
      [DataMember(Name ="empID", IsRequired = false,EmitDefaultValue = false)]
    public string empID { get; set; }
      [DataMember(Name ="schemaAgencyName", IsRequired = false,EmitDefaultValue = false)]
    public string schemaAgencyName { get; set; }
      [DataMember(Name ="givenName", IsRequired = false,EmitDefaultValue = false)]
    public string givenName { get; set; }
      [DataMember(Name ="familyName", IsRequired = false,EmitDefaultValue = false)]
    public string familyName { get; set; }
      [DataMember(Name ="password", IsRequired = false,EmitDefaultValue = false)]
    public string password { get; set; }
      ....

}

}

我也尝试过

 [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]

也作为属性。没有运气。我也这样做过

 var t = JsonConvert.SerializeObject(usr, Newtonsoft.Json.Formatting.None,
                                                new JsonSerializerSettings
                                                    {NullValueHandling = NullValueHandling.Ignore});

其中“usr”是用户实例。我的意思是，“t”带着所有 10 个属性返回

{"userID":"vick187","ssn":"","empID":"","schemaAgencyName":"","givenName":"","familyName":"","password":"pwd1234",...}

正如您所看到的，仅填充了用户 ID 和密码。但我的 ssn、empID 等仍然出现。我只想要用户名和密码。任何帮助，将不胜感激。

只是装饰属性[JsonProperty(NullValueHandling = NullValueHandling.Ignore)]只应该做你想做的事。除非该属性被设置为空字符串。

只是想知道，为什么需要 DataMember 属性？

这是一个工作链接点网小提琴 https://dotnetfiddle.net/vWj5Zx

using System;
using Newtonsoft.Json;
using System.ComponentModel;

public class Program
{

    public static void Main()
    {
        var user = new User();

        user.UserID = "1234";
        user.ssn = "";

        var settings = new JsonSerializerSettings();

        settings.NullValueHandling = NullValueHandling.Ignore;
        settings.DefaultValueHandling = DefaultValueHandling.Ignore;


        Console.WriteLine(JsonConvert.SerializeObject(user, settings));
    }
}

public class User
{
    [DefaultValue("")]
    public string UserID { get; set; }

    [DefaultValue("")]
    public string ssn { get; set; }

    [DefaultValue("")]
    public string empID { get; set; }

    [DefaultValue("")]
    public string schemaAgencyName { get; set; }

    [DefaultValue("")]
    public string givenName { get; set; }

    [DefaultValue("")]
    public string familyName { get; set; }

    [DefaultValue("")]
    public string password { get; set; }
}