使用jquery中的ajax进行post请求时，报错，提示[object XMLHttpRequest]

问题描述：使用jquery进行ajax post请求时，报错，提示[object XMLHttpRequest]，在谷歌浏览器中发现此问题，IE7/8/9/10都没问题

现象1：



现象2：

同时在事件查看器中也相应发现如下事件内容：

Event code: 3005
Event message: 发生了未处理的异常。
Event time: 2013/7/3 15:53:23
Event time (UTC): 2013/7/3 7:53:23
Event ID: b3b2dd2f8f88403f87810651cfabbfb6
Event sequence: 74
Event occurrence: 1
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/2/ROOT-8-130173115807222308
Trust level: Full
Application Virtual Path: /
Application Path: D:\Project\Portal\code\MaintenanceSystem.Web\
Machine name: PC201305021047

Process information:
Process ID: 3876
Process name: w3wp.exe
Account name: PC201305021047\Administrator

Exception information:
Exception type: HttpException
Exception message: 远程主机关闭了连接。错误代码是 0x80070057。

Request information:
Request URL: http://localhost:8001/WebService/DataSync.aspx Request path: /WebService/DataSync.aspx
User host address: ::1
User:
Is authenticated: False
Authentication Type:
Thread account name: PC201305021047\Administrator

Thread information:
Thread ID: 16
Thread account name: PC201305021047\Administrator
Is impersonating: False
Stack trace:    在 System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
在 System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush()
在 System.Web.HttpResponse.Flush(Boolean finalFlush)
在 System.Web.UI.HtmlTextWriter.Write(String s)
在 System.Web.UI.LiteralControl.Render(HtmlTextWriter output)
在 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
在 System.Web.UI.Page.Render(HtmlTextWriter writer)
在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Custom event details:

前台请代码如下：

$.ajax({
url: '/WebService/DataSync.aspx',
type: 'POST',
data: { Action: "GETCATEGORYCODE", CategoryId: cid, ParentId: pid, Order: order },
dataType: 'text',
timeout: 1000,
error: function(ex) { alert(ex); },
success: function(result) {
var r = result.split(":");
$('#<%=txtCategoryCode.ClientID %>').val(r[1]);
if (r[0] == "true") {
$('#<%=txtCategoryCode.ClientID %>').next().hide();
$('#<%=RequiredFieldValidator2.ClientID %>').show();
$('#<%=RequiredFieldValidator2.ClientID %>').html("编码已存在");
$('#<%=btnSave.ClientID %>').attr("disabled", true);
}
else {
$('#<%=txtCategoryCode.ClientID %>').next().show();
$('#<%=RequiredFieldValidator2.ClientID %>').hide();
$('#<%=btnSave.ClientID %>').attr("disabled", false);
}
}
});

后台DataSync.aspx.cs代码如下：

protected void Page_Load(object sender, EventArgs e)
{
Response.Clear();
Response.BufferOutput = false;
Response.ContentEncoding = System.Text.Encoding.UTF8;
switch (Action)
{
case DataSyncAction.GetCategoryCode:
GetCategoryCode();
break;
default:
break;
}
Response.Flush();
Response.End();
Response.Close();
}

解决方法：

发现在以上后台代码中如果将Response.BufferOutput的值改为true现象1仍然存在，但现象2消失，如果进一步将以上代码中的Response.Flush();去掉的话则问题解决。

正确代码如下：

protected void Page_Load(object sender, EventArgs e)
{
Response.Clear();
Response.BufferOutput = true;
Response.ContentEncoding = System.Text.Encoding.UTF8;
switch (Action)
{
case DataSyncAction.GetCategoryCode:
GetCategoryCode();
break;
default:
break;
}
//Response.Flush();去掉此句代码
Response.End();
Response.Close();
}