我是 ASP 的新手，对此有点困惑。我有一个中继器 ( basicInfoReport ) 链接到数据源 ( basicInfo )。这部分工作正常； Eval中继器中的调用正在返回正确的数据。
我还有一些代码隐藏，旨在设置文本代替 <asp:Literal>在页面上。我在下面放了两者的片段。
据我所知，转发器正在被数据绑定(bind)(因为 Eval 调用正在工作)，所以我无法弄清楚为什么它报告零项，因此，foreach语句什么都不做。谁能帮忙？ :)
编辑:已解决，请在更下方查看更新的代码
ASP(删除无关内容)
<asp:AccessDataSource ID="basicInfo" runat="server"
DataFile="~/Disasters.accdb"
SelectCommand="SELECT * FROM [DisasterTable] WHERE ([ID] = ?)">
<SelectParameters>
<asp:QueryStringParameter Name="ID" QueryStringField="ID" Type="Int32" />
</SelectParameters>
</asp:AccessDataSource>
<asp:Repeater ID="basicInfoReport" runat="server" DataSourceID="basicInfo"
onitemdatabound="basicInfoReport_ItemDataBound">
<ItemTemplate>
<h2>Disaster report: <%#Eval("Description")#%></h2>
<b><i>This report is confidential.</i></b><br /><br /><br />
This event was reported on <tt><%#Eval("dateReported")#%></tt>. It was reported <asp:Literal ID="_wasReportedAnonymously" runat="server"></asp:Literal> and is currently <asp:Literal ID="_isEmergency" runat="server"></asp:Literal> classed as an emergency.
</ItemTemplate>
</asp:Repeater>
C#(已删除无关内容)
protected void basicInfoReport_ItemDataBound(object sender, RepeaterItemEventArgs e) {
// [...]
// reader refers to an OleDbDataReader that is used for some database interaction in this method.
// until this point, basicInfoReport has not been referenced at all.
if (reader[1].ToString().Equals("False"))
{
// at this point basicInfoReport.Items.Count is always zero
foreach (RepeaterItem repeaterItem in basicInfoReport.Items) {
// control never makes it this far
if (repeaterItem.ItemType == ListItemType.Item || repeaterItem.ItemType == ListItemType.AlternatingItem)
{
Literal emergencyLiteral = (Literal)repeaterItem.FindControl("_isEmergency");
emergencyLiteral.Text = "not";
}
}
}
// [...]
}
更新:感谢 almog.ori 的帮助，解决了这个问题。供我引用，这里是工作代码:
C#(已删除无关内容)
protected void basicInfoReport_ItemDataBound(object sender, RepeaterItemEventArgs e) {
// [...]
// reader refers to an OleDbDataReader that is used for some database interaction in this method.
// until this point, basicInfoReport has not been referenced at all.
if (reader[1].ToString().Equals("False"))
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
Literal emergencyLiteral = (Literal)e.Item.FindControl("_isEmergency");
emergencyLiteral.Text = "not";
}
}
// [...]
}
最佳答案
您应该查看 ItemDataBound 的 msdn 文档事件，特别注意事件参数的用法。
void R1_ItemDataBound(Object Sender, RepeaterItemEventArgs e) {
// This event is raised for the header, the footer, separators, and items.
// Execute the following logic for Items and Alternating Items.
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) {
事件 ItemDataBound 将事件参数中的“行”交给您。所以你可以用它做你喜欢的事。您应该查看 e.Item.DataItem，这将是被绑定(bind)项目的数据项
关于c# - asp : repeater. items.count 始终为零，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5848555/