ASP. NET built-in object JSON string and object class conversion, asp. netjson

ASP. NET built-in object JSON string and object class conversion, asp. netjson

For more information about JSON, google! If I want to write it, I will also copy it after Google! Hey, I have always wanted to learn json, and I have learned a little about it by looking for a lot of materials and writing demos! Get started!

Encapsulate a class first! This category can be found on the Internet! With this class, everything 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 the object to a 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 to add reference System. serviceModel. web/*** if you do not add the above reference, System. runtime. serialization. json; Json is the bytes of the Oh **/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> /// restore the JSON string 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 object class:

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 "});} // convert a list to a 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 the eval function var json = eval (jsonStr ); // because the list set above is for (var I = 0; I <json. length; I ++) {alert (json [I]. id + "Name:" + json [I]. name) ;}</script> 
Please test the conversion of json strings to entities! Everything can be done as long as there is the JsonHelper class above!

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