WebForm obtains the object class data, fills the page (pass the value using session), webformsession

WebForm obtains the object class data, fills the page (pass the value using session), webformsession
Use AJAX to obtain data asynchronously and dynamically display data on the page

<1>

Create a UserService class.

Using System; using System. collections. generic; using System. linq; using System. web; using System. data; namespace ModelService {public class UserService {public static string SelectDataToJson () {// Save the Data queried from the database to a able DataTable dt = SqlHelper. executeDataTable ("select * from T_User"); // example of converting the dt table to Json format: {"Json": [{"Id": "1 ", "UserName": "Zhang San"}]} string JsonStr = DataTableToJson. dtToJson ("Json", dt); // return this Json string return JsonStr ;}}}

<2>

Create a Handler1.ashx (get data from AJAX requests)

Using System; using System. collections. generic; using System. linq; using System. web; using entity class. modelService; namespace entity class {// <summary> // summary of Handler1 /// </summary> public class Handler1: IHttpHandler {public void ProcessRequest (HttpContext context) {context. response. contentType = "text/html"; // call the SelectDataToJson () method in the UserService class to obtain a Json string (the string stores the data queried by executing the SQL statement) string str = UserService. selectDataToJson (); // write data to the context of the browser. response. write (str) ;}public bool IsReusable {get {return false ;}}}}

<3>

WebForm1.aspx page

<% @ Page Language = "C #" AutoEventWireup = "true" CodeBehind = "WebForm1.aspx. cs" Inherits = "entity class. WebForm1" %> <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 




Pass the data to the WebForm. aspx page to display the data in the form of Session values.
<1>
First, create an object class User

Using System; using System. collections. generic; using System. linq; using System. web; namespace entity class {public class User {public int Id {get; set;} public string UserName {get; set;} public int Age {get; set ;} public int Gender {get; set ;}}}

<2>
Call SqlHelper to convert the queried data into a list object (map the queried data to the object class)

Using System; using System. collections. generic; using System. linq; using System. web; using System. data; namespace entity class. modelService {public class UserService {public static List <User> SelectDataToEntity () {// by querying the database, convert the obtained data into a list List <User> list = SqlHelper. selectDataToList <User> ("select * from T_User"); return list ;}}}

<3>


WebForm1.aspx. cs page (Note: The WebForm1.aspx page inherits the WebForm1.aspx. cs class)


Using System; using System. collections. generic; using System. linq; using System. web; using System. web. UI; using System. web. UI. webControls; using entity class. modelService; namespace entity class {public partial class WebForm1: System. web. UI. page {protected void Page_Load (object sender, EventArgs e) {// store the obtained list (List <User> lsit) to the Session. You can then traverse this list on the WebForm1.aspx page to obtain the object class data Session. Add ("User", UserService. SelectDataToEntity ());}}}





<4>
WebForm1.aspx page

<% @ Page Language = "C #" AutoEventWireup = "true" CodeBehind = "WebForm1.aspx. cs" Inherits = "entity class. WebForm1" %> <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">