从 json 序列化对象中删除空字符串属性 [英] Remove empty string properties from json serialized object

问题描述

我有一堂课.它有几个属性，比如说 10 个.在这 10 个中，3 个填充了数据，其余 7 个是空白的.即.空字符串 "" 使用此 link 作为参考.我只想显示 NON-NULL 和 NON-EMPTY 字符串属性.但是最终输出具有所有 10 个属性.我只想看 3.

I have a class. It has several properties lets say 10. Out of these 10, 3 are filled with data remaining 7 are blank.i.e. empty strings "" Used this link as reference. I would like only NON-NULL and NON-EMPTY string properties to be shown. But the end output has all 10 properties. I want only to see 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; }
      ....

}

}

我也试过

 [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]

也作为属性.没有运气.我也喜欢这个

as the attribute too. No luck. I also did like this

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

其中 'usr' 是用户实例.运气不好，我的意思是，'t' 返回所有 10 个属性

where 'usr' is the User instance. By no luck I mean, the 't' comes back with all the 10 properties

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

如您所见，仅填充了用户 ID 和密码.但是我仍然显示 ssn、empID 等.我只想要用户名和密码.任何帮助将不胜感激.

So as you can see only userID and password are populated. But I have ssn, empID etc still showing up. I only want userID and password. Any help would be appreciated.

推荐答案

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

Just decorating the properties [JsonProperty(NullValueHandling = NullValueHandling.Ignore)] ONLY should do what you want. Unless the property is getting set to an empty string.

只是想知道，为什么需要 DataMemeber 属性?

Just wondering, why do you need the DataMemeber attribute?

这是一个链接到一个有效的 dotnetfiddle

Here is a link to a working dotnetfiddle

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; }
}

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