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Private static readonly object ReflectionLock = new object();
Lock (ReflectionLock)
{
Type scriptManagerType =
Type.GetType(
"System.Web.UI.ScriptManager, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35",
false);
if (scriptManagerType != null)
// ASP.NET AJAX is installed.
else
// ASP.NET AJAX is not installed.

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ScriptManager sm = ScriptManager.GetCurrent(Page)
if (sm == null)
{
// ASP.NET AJAX functionality is not enabled for the page.
}
else
{
// AJAX functionality is enabled for the page.
}

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Õâ¸öÐÅÏ¢ÊÇ´ÓWebConfigÎļþÖеõ½µÄ¡££¨² ......

È·¶¨ ASP.NET AJAX ¹¦ÄÜÊÇ·ñ¿ÉÓà AJAXÊÇ·ñ°²×°

Private static readonly object ReflectionLock = new object();
Lock (ReflectionLock)
{
Type scriptManagerType =
Type.GetType(
"System.Web.UI.ScriptManager, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35",
false);
if (scriptManagerType != null)
// ASP.NET AJAX is installed.
else
// ASP.NET AJAX is not installed.

¼ì²éÊÇ·ñÒÑΪµ¥¸öÒ³ÆôÓà AJAX ¹¦ÄÜ
ScriptManager sm = ScriptManager.GetCurrent(Page)
if (sm == null)
{
// ASP.NET AJAX functionality is not enabled for the page.
}
else
{
// AJAX functionality is enabled for the page.
}

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ͬÑù£¬¿ÉÒÔͨ¹ý´Ë·½·¨£¬¶ÔÆäËüµÄ×é¼þ½øÐÐÅжϣ¬ÈçActiveReportµÄÅжϠ "DataDynamics.ActiveReports.Web.Handlers.CompiledReportHandler, ActiveReports.Web, Version=5.1.0.158, Culture=neutral, PublicKeyToken=cc4967777c49a3ff",
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<script language="javascript" type="text/javascript">
var xmlHttp = new XMLHttpRequest();
</script>
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<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {

public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
context.Response.Write("Hello World");
}

public bool IsReusable {
get {
return false;
}
}
}
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