我有两个用户控件。每个用户控件包含一个ListView。这两个用户控件的用途是显示主数据/详细数据。当引发事件ResourceReassigned时,总是抛出一个空引用异常。我在做什么错误,这意味着我的事件处理程序分配不工作?从另一个用户控件刷新用户控件中的ListView
<asp:ListView ID="lvStaffer" runat="server">
<LayoutTemplate>
<table>
<tr id="itemplaceholder" runat="server"></tr>
</table>
</LayoutTemplate>
<ItemTemplate>
<tr>
<td>
<asp:UpdatePanel ID="upResourceListViewControlItem" runat="server">
<ContentTemplate>
<rw:ResourceListViewControl ID="ResourceListViewControlItem" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
</ItemTemplate>
</asp:ListView>
public partial class Control_ResourceListViewControl : StafferWebControlBase
{
public event EventHandler ResourceReassigned;
protected void lvResource_ItemUpdating(Object sender, ListViewUpdateEventArgs e)
{
// If an item in lvResource is updated we want to refresh the master lvStaffer
// ListView so we raise an event. Null Reference Exception is thrown here.
ResourceReassigned(sender, new EventArgs());
}
}
public partial class Control_StafferListViewControl : StafferWebControlBase
{
protected void lvStaffer_ItemDataBound(Object sender, ListViewItemEventArgs e)
{
Control_ResourceListViewControl resourceListViewControlItem =
(Control_ResourceListViewControl)e.Item.FindControl("ResourceListViewControlItem");
if (resourceListViewControlItem != null)
{
// Each item in lvStaffer contains an instance of the ResourceListViewControl object.
// Each object is a subscriber of the ResourceReassigned event.
resourceListViewControlItem.ResourceReassigned += new EventHandler(lvStaffer_ResourceReassigned);
}
}
protected void lvStaffer_ResourceReassigned(object sender, EventArgs e)
{
// Repopulates and binds the lvStaffer ListView
ResetStafferListView();
}
}
做才能让你的数据绑定列表视图每次或只要页面没有回传? –
仅当页面不是回发时,lvStaffer ListView才被绑定。 – dior001
我编辑了你的标题。请参阅:“[应该在其标题中包含”标签“](http://meta.stackexchange.com/questions/19190/)”,其中的共识是“不,他们不应该”。 –