所以我已经用尽了我能找到的所有帮助，但仍然很难过。
我在转发器中有一个 DDL，我需要在同一个转发器中异步回发并更新更新面板：
<asp:Repeater ID="rptOverdue" runat="server"
OnItemDataBound="setUpDateActionsSpecial">
<ItemTemplate>
<div class="theActions clearfix overdue edit hiddenrepeater" id='action_<%# Eval("item_id")%>'>
<span class="actionid"><%# Eval("item_id") %></span>
<div class="actiontitle">
<asp:TextBox ID="tbTitle" CssClass="theTitle" runat="server" Text='<%# Eval("item_title") %>' />
</div>
<div class="actionicons">
<a href="#" onclick='cancelUpdateAction(<%# Eval("item_id") %>)'><i class="icon-remove-sign actioniconcancel"></i></a>
<a href="#" onclick='commitUpdateAction(<%# Eval("item_id") %>)'><i class="icon-ok-sign actioniconok"></i></a>
</div>
<div class="actiondate">
<div class="input-append date" id="dp_<%# Eval("item_id") %>" data-date="<%= String.Format("{0:yyyy-MM-dd}", DateTime.Now) %>" data-date-format="yyyy-mm-dd">
<asp:TextBox ID="when2" CssClass="span2 theDuedate" size="16" type="text" name="when" placeholder="Due Date" runat="server" Text='<%# String.Format("{0:yyy-MM-dd}",Eval("item_duedate")) %>' />
<span class="add-on"><i class="icon-th"></i></span>
</div>
</div>
<div class="actionmeta">
<asp:DropDownList ID="ddlUpdateArea" CssClass="ddlUpdateArea" runat="server"></asp:DropDownList>
<asp:UpdatePanel ID="upDdlGoal" runat="server" UpdateMode="always">
<ContentTemplate>
<asp:DropDownList ID="ddlUpdateGoal" CssClass="ddlUpdateGoal" runat="server"></asp:DropDownList>
</ContentTemplate>
<Triggers>
</Triggers>
</asp:UpdatePanel>
<asp:UpdatePanelAnimationExtender ID="ae" runat="server" TargetControlID="upDdlGoal">
<Animations>
<OnUpdating>
<FadeOut Duration=".3" Fps="20" minimumOpacity=".5" />
</OnUpdating>
<OnUpdated>
<sequence>
<FadeIn Duration=".3" Fps="20" minimumOpacity=".5" />
<ScriptAction Script=" $('.goaliconplus').tooltip({ placement: 'top', trigger: 'hover', title: 'Add' });
$('.goaliconeye').tooltip({ placement: 'top', trigger: 'hover', title: 'Edit' });
$('.actioniconlist').tooltip({ placement: 'top', trigger: 'hover', title: 'View list' });
$('.actioniconnote').tooltip({ placement: 'top', trigger: 'hover', title: 'View note' });
$('.actioniconeye').tooltip({ placement: 'top', trigger: 'hover', title: 'Edit' });
$('.actionicondelete').tooltip({ placement: 'top', trigger: 'hover', title: 'Delete' });
$('.actioniconcomplete').tooltip({ placement: 'top', trigger: 'hover', title: 'Complete' });
scrollItemList();" />
</sequence>
</OnUpdated>
</Animations>
</asp:UpdatePanelAnimationExtender>
</div>
</div>
</ItemTemplate>
</asp:Repeater>
我在中继器的 ItemDataBound 事件中设置了触发器和自动回发等：
protected void setUpDateActionsSpecial(object sender, RepeaterItemEventArgs e)
{
if ((e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem))
{
// Bind DDLs
DropDownList ddlAreas = (DropDownList)e.Item.FindControl("ddlUpdateArea");
DropDownList ddlGoals = (DropDownList)e.Item.FindControl("upDdlGoal").FindControl("ddlUpdateGoal");
UpdatePanel upDdlGoal = (UpdatePanel)e.Item.FindControl("upDdlGoal");
DataRowView drv = e.Item.DataItem as DataRowView;
ddlAreas.DataSource = (DataTable)Session["arealist"]; ;
ddlAreas.DataTextField = "area_title";
ddlAreas.DataValueField = "area_id";
ddlAreas.DataBind();
ddlAreas.SelectedValue = drv["goal_area"].ToString();
// Register Area DDL for postback
ddlAreas.SelectedIndexChanged += updateTheGoals;
ddlAreas.AutoPostBack = true;
AsyncPostBackTrigger trigger = new AsyncPostBackTrigger();
trigger.ControlID = ddlAreas.UniqueID;
trigger.EventName = "SelectedIndexChanged";
upDdlGoal.Triggers.Add(trigger);
if (ScriptManager.GetCurrent(Page).IsInAsyncPostBack)
{
triggerInitMethod.Invoke(trigger, null);
}
DataTable goalTable = (DataTable)Session["goallist"];
DataRow[] goalsDR = goalTable.Select("goal_area = " + ddlAreas.SelectedValue);
DataTable goalFiltered = goalTable.Clone();
foreach (DataRow row in goalsDR)
{
goalFiltered.ImportRow(row);
}
goalFiltered.AcceptChanges();
ddlGoals.DataSource = goalFiltered;
ddlGoals.DataTextField = "goal_title";
ddlGoals.DataValueField = "goal_id";
ddlGoals.DataBind();
ddlGoals.SelectedValue = drv["item_goal"].ToString();
litEmptyActionsDate.Visible = false;
}
}
这应该异步回发并在 updateTheGoals 事件处理程序中执行代码：
protected void updateTheGoals(object sender, EventArgs e)
{
// Bind DDLs
DropDownList ddlAreas = (DropDownList)sender;
UpdatePanel thisUP = (UpdatePanel)ddlAreas.Parent.FindControl("upDdlGoal");
DropDownList ddlGoals = (DropDownList)thisUP.FindControl("ddlUpdateGoal");
DataTable goalTable = (DataTable)Session["goallist"];
DataRow[] goalsDR = goalTable.Select("goal_area = 1024");// + ddlAreas.SelectedValue);
DataTable goalFiltered = goalTable.Clone();
foreach (DataRow row in goalsDR)
{
goalFiltered.ImportRow(row);
}
goalFiltered.AcceptChanges();
ddlGoals.DataSource = goalFiltered;
ddlGoals.DataTextField = "goal_title";
ddlGoals.DataValueField = "goal_id";
ddlGoals.DataBind();
ddlGoals.Items.Insert(0, new ListItem("Choose a Goal", "0"));
ddlGoals.SelectedValue = "Choose a Goal";
thisUP.Update();
}
实际发生的是更新面板似乎进行了更新（动画运行并完成），但 ddlUpdateGoal 下拉列表的实际内容并没有改变。它似乎正在执行异步回发，但实际上并未运行 SelectedIndexChanged 事件处理程序来更改更新面板的内容。
有没有人遇到过这个问题？（感谢所有帮助，在我在办公室启动显示器之前！）
谢谢，本