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ASP. NET Conversion of JSON String and Entity Class

  • 2021-08-03 09:59:38
  • OfStack

For more information about JSON, please find out about google by yourself! If you want me to write, I also go to Google after copy! Hehe, 1 straight since want to learn json, a lot of information and write demo, finally a little understanding! Get down to business!

Let's encapsulate a class first! This class can be found online! With this class, 1 cut will become simple, haha. 


 using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization.Json;
using System.ServiceModel.Web;/// Remember to reference this namespace 
using System.IO;
using System.Text;
/// <summary>
/// Summary description for JsonHelper
/// </summary>
public class JsonHelper
{
  public JsonHelper()
  {
    //
    // TODO: Add constructor logic here
    //
  }
  /// <summary>
  ///  Serialize an object  JSON  String  
  /// </summary>
  /// <typeparam name="T"> Object type </typeparam>
  /// <param name="obj"> Object entity </param>
  /// <returns>JSON String </returns>
  public static string GetJson<T>(T obj)
  {
    // Remember   Add Reference  System.ServiceModel.Web 
    /**
     *  If you do not add the above reference ,System.Runtime.Serialization.Json; Json You can't get out. 
     * */
    DataContractJsonSerializer json = new DataContractJsonSerializer(typeof(T));
    using (MemoryStream ms = new MemoryStream())
    {
      json.WriteObject(ms, obj);
      string szJson = Encoding.UTF8.GetString(ms.ToArray());
      return szJson;
    }
  }
  /// <summary>
  ///  Put JSON String is restored to an object 
  /// </summary>
  /// <typeparam name="T"> Object type </typeparam>
  /// <param name="szJson">JSON String </param>
  /// <returns> Object entity </returns>
  public static T ParseFormJson<T>(string szJson)
  {
    T obj = Activator.CreateInstance<T>();
    using (MemoryStream ms = new MemoryStream (Encoding.UTF8.GetBytes(szJson)))
    {
      DataContractJsonSerializer dcj = new DataContractJsonSerializer(typeof(T));
      return (T)dcj.ReadObject(ms);
    }
  }
}

Test entity classes: 


public class TestData
{
  public TestData()
  {
  }
  public int Id { get; set; }
  public string Name { get; set; }
  public string Sex { get; set; }
}

Test page: 


<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
  protected void Page_Load(object sender, EventArgs e)
  {
    string jsonStr = string.Empty;
    List<TestData> tds = new List<TestData>();
    // Test data 
    for (int i = 1; i < 4; i++)
    {
      tds.Add(new TestData() { Id = i, Name = "jinho" + i, Sex = "male" });
    }    // Put 1 A list Convert to json String 
    jsonStr = JsonHelper.GetJson<List<TestData>>(tds);
    Response.Write(jsonStr);
    this.Page.ClientScript.RegisterStartupScript(this.GetType(), "json", "getJson(" + jsonStr + ");", true);
  }
  
</script>
<script type="text/javascript">
  function getJson(jsonStr) {    // Use eval Function 
    var json = eval(jsonStr);     // Because it says list Set 
    for (var i = 0; i < json.length; i++) {
      alert(json[i].Id + "Name:" + json[i].Name);
    }
  }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title></title>
</head>
<body>
  <form id="form1" runat="server">
  <div>
  
  </div>
  </form>
</body>
</html>

About json string conversion into entity, please test it yourself! As long as there is the above JsonHelper class, 1 cut is easy to handle!

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