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Can the panel be used with a WebMethod in an aspx.cs?

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XmlHttpPanel
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sitefinitysteve
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sitefinitysteve asked on 15 Sep 2010, 02:49 PM
Title says it all....the amount of asmx files I'm accumulating becasue I use (overuse? :) the RadXmlHttpPanel is getting a little crazy.

Can I do a quick one or two in the page with a WebMethod? 

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Pero
Telerik team
answered on 17 Sep 2010, 02:07 PM
Hello Steve,

Indeed this is possible, and we will document this feature as soon as we can. It is done in the following way:

  1. Set EnablePageMethods="true" to the ScriptManager control on the page.
  2. Set RadXmlHttpPanel's WebMethodPath property to the path of the page containing the method in its code behind.
  3. Make sure the method is a static one (shared in VB).
  4. Make sure the method is marked as WebMethod

For your convenience I have created a simple page demonstrating this. Here is the code:

.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PAGE_WebService.aspx.cs"
    Inherits="Default_Callback" %>
 
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<head id="Head1" runat="server">
    <title></title>
    <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
        <script type="text/javascript">
            function SetValue()
            {
                var panel = $find("<%=XmlPanel1.ClientID %>");
                panel.set_value("Some Value");
            }
        </script>
    </telerik:RadScriptBlock>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
    </asp:ScriptManager>
    <div>
        <input value="Set Value" onclick="SetValue(); return false;" type="button" />
        <telerik:RadXmlHttpPanel ID="XmlPanel1" runat="server" EnableClientScriptEvaluation="true"
            WebMethodName="HelloWorld" WebMethodPath="~/PAGE_WebService.aspx">
        </telerik:RadXmlHttpPanel>
    </div>
    </form>
</body>
</html>


.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Script.Serialization;
using System.Web.Services;
 
 
public partial class Default_Callback : System.Web.UI.Page
{
    [WebMethod]
    public static string HelloWorld()
    {
        return "Hello World called at:" + DateTime.Now.ToString();
    }
}

Regards,
Pero
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sitefinitysteve
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answered on 17 Sep 2010, 04:33 PM
That's great news!

Now let me throw you for another loops ;)

Can it be done inside a Composite Control :D  What I'm doing in my Composites right now is exposing the path as a public property and in my page pointing that at an external ASMX whos class points back to the Assembly which contains the service.
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Pero
Telerik team
answered on 22 Sep 2010, 12:27 PM
Hello Steve,

I believe that this is not possible, because your custom composite control must inherit from System.Web.Services.WebService and System.Web.UI.WebControls.CompositeControl. This is not possible with C# and VB.NET, because they do not support multiple inheritance, which means that you cannot inherit from multiple base classes. WebService and CompositeControl are both base classes, and you can derive only one of them.

Greetings,
Pero
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