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

我上课。它具有几个属性，可以说10.在这10个中，有3个填充了数据，其余7个是空白。空字符串使用此链接作为参考。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。我只想看到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; }
      ....

}

}

我也尝试过

 [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]

也是该属性。没运气。我也这样

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User实例。运气不好，我的意思是， t会返回所有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",...}

因此您可以看到仅填充了用户名和密码。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

只需修饰属性 [JsonProperty（NullValueHandling = NullValueHandling.Ignore） ] 仅应执行您想要的操作。除非将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.

在想，为什么需要DataMemeber属性？

Just wondering, why do you need the DataMemeber attribute?

这里是指向有效的 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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