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每人能回答吗？我想把代码贴上来的，可是东西不少。我决定只粘贴页面和和web control的page_load和page_init代码好了。问题可能出现在这两个地方。
前台的页面关系应该不大，所以就不贴代码了。
aspx的 c# code:
public partial class ConfigCallType : System.Web.UI.Page
{
public Session session;
protected void Page_Load(object sender, EventArgs e)
{
if (this.Page == null || this.Com == null) return;
Object layer = Application["XpoLayer"];
session = new DevExpress.Xpo.Session(layer as IDataLayer);
if (Page.IsPostBack == false )
{
//for the first time
AddObjectPopup.Windows.Add(new PopupWindow("loading", "Company"));
AddObjectPopup.Windows.Add(new PopupWindow("loading", "SubCompany"));
AddObjectPopup.Windows.Add(new PopupWindow("loading", "CallType"));
}
}
protected void Page_Init(object sender, EventArgs e)
{
if (this.Page == null || Com == null)
{
if (this.Page != null && Page.IsPostBack == true) { this.Response.Clear(); this.Response.End(); }//for the bug that I can't solve
if (this.Page != null && Page.IsPostBack == false) { Response.Redirect(Request.Url.ToString()); } //for the bug of logging out
}
Object layer = Application["XpoLayer"];
session = new DevExpress.Xpo.Session(layer as IDataLayer);
//set up relation
SubCom.ParentObject = Com;
ct.ParentObject = SubCom;
Com.PageUser = User.Identity.Name;
SubCom.PageUser = User.Identity.Name;
Com.LimitedByUser = true;
SubCom.LimitedByUser = true;
// set up event
Com.BubbleRaise += new EventHandler(Com_BubbleRaise);
SubCom.BubbleRaise += new EventHandler(SubCom_BubbleRaise);
ct.BubbleRaise += new EventHandler(ct_BubbleRaise);
}
WebControl的代码:
SimpleObject.ascx.cs ,上述页面中定义的Com, SubCom和ct都是该控件的对象。
protected void Page_Load(object sender, EventArgs e)
{
if (session == null)
{
System.Type type = this.Page.GetType();
FieldInfo pi = type.GetField("session", BindingFlags.Public | BindingFlags.Instance);
if (pi != null)
{
session = (Session)pi.GetValue(this.Page);
}
}
if (this.Page.IsPostBack == false)
{
BindObject();
}
}
还有一部分web control的自定义事件的代码也一起贴上来了：
protected void RefreshBtn_Click(object sender, EventArgs e)
{
BindObject();
BubbleUp(sender, e);
}
private void BubbleUp(object sender, EventArgs e)
{
EventHandler BubbleRaised = (EventHandler)Events[EventBubbleRaised];
if (BubbleRaised != null)
BubbleRaised(this, e);
}
private static readonly object EventBubbleRaised = new object();
#region Event Handler
public event EventHandler BubbleRaise
{
add
{
Events.AddHandler(EventBubbleRaised, value);
}
remove
{
Events.RemoveHandler(EventBubbleRaised, value);
}
}
#endregion
其它的BindObject方法之类的代码感觉和问题关系不大就不贴了。代码里使用了devExpress，但是用的是XPO这个ORM，感觉和这种页面生命周期的问题应该没什么大关系。
问题再说一次，就是this.Page以及com,subCom等对象为null而报错。在page_init里出错的，一开始我是把page_init里的代码都放到page_load里的，但是也是同样地出错的。我就想不通了，凭什么AJAX updatepanel postback回来的时候this.Page都为null值？(在debug的watch里看到的)。
而且吧它也不是每次都为null,感觉如果每次点击前等一小会就没问题，像是等页面在上一次AJAX的东西完全处理完的感觉。
其中，下面的代码就是用来避免页面上出错的。用了Response.End()，就可以不报错，但是对事件的AJAX响应就没有了，客户端没有更新。所以只能是一个临时的workaround.
if (this.Page == null || Com == null)
{
if (this.Page != null && Page.IsPostBack == true) { this.Response.Clear(); this.Response.End(); }//for the bug that I can't solve
if (this.Page != null && Page.IsPostBack == false) { Response.Redirect(Request.Url.ToString()); } //for the bug of logging out
}
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