datalist数据绑定是时遇到的问题
protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
Repeater Repeater1;
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
int liuyanid = Convert.ToInt32(DataBinder.Eval(e.Item.DataItem, "id"));
Repeater1 = e.Item.FindControl("Repeater1") as Repeater;
dv = NoticesManage.getreplybyliuyan(liuyanid).Tables[0].DefaultView;
Repeater1.DataSource = dv;
Repeater1.DataBind();
}
}
请问这句话是干吗的？加与不加有什么区别？
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
[解决办法]
就是判断当前行是ItemTemplate或者AlternatingItemTemplate里面的内容
因为还有SelectedItem,EditItem等。
参见
http://msdn.microsoft.com/zh-cn/library/system.web.ui.webcontrols.listitemtype.aspx
执行下面的代码，你就明白这些判断的含义了
- HTML code
<%@ Page Language="C#" AutoEventWireup="true" EnableViewState="true" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server"> protected void Page_Load(object sender, EventArgs e) { DataList1.DataSource = new String[] { "A", "B", "C", "D", "E", "F", "G", "H" }; DataList1.DataBind(); } protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e) { //只有加判断，下面的代码才不会出错 if (e.Item.ItemType == ListItemType.Header) { CheckBox CheckBox1 = e.Item.FindControl("CheckBox1") as CheckBox; CheckBox1.Checked = true; } //要改变内容，需要e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem //不加判断，是会出错的， //也可以使用if(e.Item.ItemIndex >-1)进行判断 if (e.Item.ItemType == ListItemType.Item) { Label x = e.Item.FindControl("x") as Label; x.Text = "修改过的内容"; } }</script><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title></title></head><body> <form id="form1" runat="server"> <asp:DataList ID="DataList1" runat="server" RepeatColumns="4" RepeatDirection="Horizontal" RepeatLayout="Flow" OnItemDataBound="DataList1_ItemDataBound"> <HeaderTemplate> <asp:CheckBox ID="CheckBox1" runat="server" /> </HeaderTemplate> <ItemTemplate> <div style="background-color: Silver"> <asp:Label ID="x" runat="server" Text="Label1"></asp:Label> <%#Container.DataItem%></div> </ItemTemplate> <AlternatingItemTemplate> <div style="background-color: Green"> <asp:Label ID="x" runat="server" Text="Label1"></asp:Label> <%#Container.DataItem%></div> </AlternatingItemTemplate> </asp:DataList> </form></body></html>