如何转换列表<object>至 Json | C#<div id="text_translate"><p> 我有一个由对象组成的列表，每个 object 有 5 个数据。 我需要将该列表转换为 json，但使用序列化它会填满空的 json。</p><p> 有谁知道我可能做错了什么？</p><pre> foreach (DataRow dtRow in dtAlarmas.Rows) { String Name = dtRow["Name"].ToString(); String ID = dtRow["ID"].ToString(); String AlarmText = dtRow["AlarmText"].ToString(); String AlarmTimeNoNula = dtRow["AlarmTimeNoNula"].ToString(); lstAlarmasNoTratadas.Add(new Ondoan.DatosAux.Alarmas.AlarmaNoTratadaModel(dtRow["Name"].ToString(), Convert.ToInt32(dtRow["ID"]), dtRow["Class"].ToString(), dtRow["AlarmText"].ToString(), dtRow["AlarmTimeNoNula"].ToString())); } string sParams = JsonConvert.SerializeObject(lstAlarmasNoTratadas);</pre><p> 转换后的 sParams 值 = "[{}]"</p><p> Class Ondoan.DatosAux.Alarmas.AlarmaNoTratadaModel</p><pre> using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Ondoan.DatosAux.Alarmas { public class AlarmaNoTratadaModel { private string Name; private int ID; private string Class; private string AlarmText; private string AlarmaTimeNoNula; public AlarmaNoTratadaModel(string Name, int ID, string Class, string AlarmText, string AlarmaTimeNoNula) { // TODO: Complete member initialization this.Name = Name; this.ID = ID; this.Class = Class; this.AlarmText = AlarmText; this.AlarmaTimeNoNula = AlarmaTimeNoNula; } public class AlarmaNoTratadasModel { public AlarmaNoTratadasModel() { } public AlarmaNoTratadasModel(String Name, Nullable&lt;System.Int32&gt; ID, String Class, String AlarmText, String AlarmaTimeNoNula) { this.Name = Name; this.ID = ID; this.Class = Class; this.AlarmText = AlarmText; this.AlarmaTimeNoNula = AlarmaTimeNoNula.ToString(); } public System.String Name { get; set; } public Nullable&lt;System.Int32&gt; ID { get; set; } public System.String Class { get; set; } public System.String AlarmText { get; set; } public System.String AlarmaTimeNoNula { get; set; } } } }</pre></div></object>

Question

I have a list made up of objects, that each object has 5 data. I need to convert that list to a json, but using serialize it fills me out the empty json.

Does anyone know what I may be doing wrong?

foreach (DataRow dtRow in dtAlarmas.Rows)
                {
                    String Name = dtRow["Name"].ToString();
                    String ID = dtRow["ID"].ToString();
                    String AlarmText = dtRow["AlarmText"].ToString();
                    String AlarmTimeNoNula = dtRow["AlarmTimeNoNula"].ToString();
                    lstAlarmasNoTratadas.Add(new Ondoan.DatosAux.Alarmas.AlarmaNoTratadaModel(dtRow["Name"].ToString(), Convert.ToInt32(dtRow["ID"]), dtRow["Class"].ToString(), dtRow["AlarmText"].ToString(), dtRow["AlarmTimeNoNula"].ToString()));
                }

                string sParams = JsonConvert.SerializeObject(lstAlarmasNoTratadas);

sParams value after convert = "[{}]"

Class Ondoan.DatosAux.Alarmas.AlarmaNoTratadaModel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Ondoan.DatosAux.Alarmas
{
   public class AlarmaNoTratadaModel
    {
        private string Name;
        private int ID;
        private string Class;
        private string AlarmText;
        private string AlarmaTimeNoNula;

        public AlarmaNoTratadaModel(string Name, int ID, string Class, string AlarmText, string AlarmaTimeNoNula)
       {
           // TODO: Complete member initialization
           this.Name = Name;
           this.ID = ID;
           this.Class = Class;
           this.AlarmText = AlarmText;
           this.AlarmaTimeNoNula = AlarmaTimeNoNula;
       }

        public class AlarmaNoTratadasModel
        {
            public AlarmaNoTratadasModel() { }
            public AlarmaNoTratadasModel(String Name, Nullable<System.Int32> ID, String Class, String AlarmText, String AlarmaTimeNoNula)
            {
                this.Name = Name;
                this.ID = ID;
                this.Class = Class;
                this.AlarmText = AlarmText;
                this.AlarmaTimeNoNula = AlarmaTimeNoNula.ToString();
            }

            public System.String Name { get; set; }
            public Nullable<System.Int32> ID { get; set; }
            public System.String Class { get; set; }
            public System.String AlarmText { get; set; }
            public System.String AlarmaTimeNoNula { get; set; }
        }
    }
}

Answer 1

The issue is that JsonConvert doesn't serialize private fields by default. Either make them public properties or add the JsonPropertyAttribute.

[JsonProperty]
private string Name;
[JsonProperty]
private int ID;
[JsonProperty]
private string Class;
[JsonProperty]
private string AlarmText;
[JsonProperty]
private string AlarmaTimeNoNula;