Beginning Ajax With ASP.NET (2006).pdf

Debugging
TestFiddler.aspx.cs — Code-Beside file
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class FiddlerExamples_TestFiddler : System.Web.UI.Page,
ICallbackEventHandler
{
protected void Page_Load(object sender, EventArgs e)
{
string js = Page.ClientScript.GetCallbackEventReference(this, “arg”,
“OnCallComplete”, “ctx”, true);
string jsFunction = “function DoCallback(arg,ctx) { “ + js + “ } “;
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), “Callback”,
jsFunction,true);
}
#region ICallbackEventHandler Members
public string GetCallbackResult()
{
System.Threading.Thread.Sleep(2000);
string[] dataToReturn = new string[] { “Data1”, “DataPart2”, “SomeData3” };
// return a hardcoded string array as a single string
return string.Join(“;”, dataToReturn);
}
public void RaiseCallbackEvent(string eventArgument)
{
// Do nothing here
}
}
#endregion
Ensure that the application runs by right-clicking on the modified page with the mouse and selecting
View in Browser. A simple web page should be displayed with a single button labeled Do Async
Callback. Clicking the button with the mouse should result in a 2-second delay and then three alert
boxes displaying the returned data values of Data1, DataPart2, and SomeData3.
This page is obviously not very complex, but it does utilize an asynchronous postback to execute a
server-side method and retrieve some data for display.
Now click on the Fiddler icon shown previously or access the Fiddler tool by selecting the Tools➪Fiddler
menu option.
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