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Calling web service with "Atlas" Beta

Wednesday, October 25, 2006

Since there are a lot of people asking how to call a web service in the new Beta version, I am going to post it here:
Testpage.aspx:

<%@ Page Language="C#" EnableViewState="true" AutoEventWireup="true" CodeFile="testpage.aspx.cs"
   Inherits="testpage" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Test Page</title>
</head>
<body>
   <form id="form1" runat="server" enableviewstate="true">
       <atlas:ScriptManager ID="ScriptManager1" runat="server">
           <Services>
               <atlas:ServiceReference Path="~/WebService.asmx" />
           </Services>
       </atlas:ScriptManager>
       <input type="button" onclick="callWebService();" value="get time" />
       <div id="Label">Loading ...</div>
      
       <script type="text/javascript">
           function callWebService()
           {
               WebService.GetServerTime(onComplete);
           }
          
           function onComplete(result)
           {
               $get('Label').innerHTML = result;
           }
       </script>
   </form>
</body>
</html>

WebService.cs:

using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;

/// <summary>
/// The client code will call this web service to get the server time
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[Microsoft.Web.Script.Services.ScriptService]
// Dont forget to include this scriptservice attribute
public class WebService : System.Web.Services.WebService {

   public WebService () {

       //Uncomment the following line if using designed components 
       //InitializeComponent(); 
   }

   [WebMethod]
   public String GetServerTime()
   {
       return DateTime.Now.ToString();
   }

However if you are calling PageMethods instead of WebService.asmx, you would have to:

"Replaced the instance page method in the CTP release with static page method support."

AND, you have to put your page method at the aspx-page level, eventhough you have code-behind files for the particular page (I think this is a bug). So for example:

<%@ Page Language="C#" EnableViewState="true" AutoEventWireup="true" CodeFile="testpage.aspx.cs"
   Inherits="testpage" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title>Test Page</title>
   <script runat="server">
       [System.Web.Services.WebMethod]
       public static String GetString()
       {
           return "This text is generated at: " + DateTime.Now.ToString();
       }
  
   </script>
</head>
<body>
   <form id="form1" runat="server" enableviewstate="true">
       <atlas:ScriptManager ID="ScriptManager1" runat="server">
           <Services>
               <atlas:ServiceReference Path="~/WebService.asmx" />
           </Services>
       </atlas:ScriptManager>
       <input type="button" onclick="callWebServer();" value="call web service" />
      
       <div id="Label">Web Service Call Label</div>
       <div id="Label2">Page Methods Label</div>
       <script type="text/javascript">
           function callWebServer()
           {
               WebService.GetServerTime(onComplete);
               PageMethods.GetString(onCompletePageMethods);
           }
          
           function onComplete(result)
           {
               $get('Label').innerHTML = result;
           }
          
           function onCompletePageMethods(result)
           {
               $get('Label2').innerHTML = result;
           }
       </script>
   </form>
</body>
</html>

The callWebServer function will call both the same webservice from the previous example and the GetString() page method.

That's all. I hope it helps anyone who needs it.

posted by a.wirayudha # 10:19 PM

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