給Repeater、Datalist和Datagrid增加自動編號列

號	內容
1	Taye
2	BOx
3	Glass
4	StarCraft

一、正序
A、AllowPaging=False情況下，使用以下方法就可以實現：
1<asp:DataGrid?id="DataGrid1"?runat="server">
2????<Columns>
3?????<asp:TemplateColumn>
4??????<ItemTemplate>
5???????<%#?Container.ItemIndex?+?1%>
6??????</ItemTemplate>
7?????</asp:TemplateColumn>
8????</Columns>
9?</asp:DataGrid>
不過更有趣的方法是使用這個方法：

1<asp:DataGrid?id="DataGrid1"?runat="server">
2????<Columns>
3?????<asp:TemplateColumn>
4??????<ItemTemplate>
5???????<%#?this.DataGrid1.Items.Count?+?1%>
6??????</ItemTemplate>
7?????</asp:TemplateColumn>
8????</Columns>
9</asp:DataGrid>
也許有些人會覺得很奇怪為什么Items.Count會這樣，而不是出來全部總合，但如果你了解綁定的過程時就容易理解。[從上面來看就是在ItemCreated事件中進行綁定所以得到的Items.Count剛好是當前的序號]

B、AllowPaging="True"下，如果DataGrid支持分頁則可以如下：
1<asp:DataGrid?id="DataGrid1"?runat="server"?AllowPaging="True">
2????<Columns>
3?????<asp:TemplateColumn>
4??????<ItemTemplate>
5???????<%#?this.DataGrid1.CurrentPageIndex?*?this.DataGrid1.PageSize?+?Container.ItemIndex?+?1%>
6??????</ItemTemplate>
7?????</asp:TemplateColumn>
8????</Columns>
9</asp:DataGrid>
二、倒序的方法

序號	內容
4	Taye
3	BOx
2	Glass
1	StarCraft

由上面可以知道使用this.DataGrid1.Items.Count - Container.ItemIndex + 1方法是不可能實現的，得到值而且全會為1，分頁的情況下更是一樣.所以一開始我們就要取得數據源的行數：

?1private?int?rowscount?=?0;
?2?????????protected?int?RowsCount
?3?????????{
?4??????????????get{?return?rowscount;}
?5??????????????set{?this.rowscount?=?value;?}
?6?????????}
?7?????
?8?????????private?void?Page_Load(object?sender,?System.EventArgs?e)
?9?????????{
10??????????????//?在此處放置用戶代碼以初始化頁面
11??????????????if(!IsPostBack)
12???????????????????this.BindData();
13?????????}
14?????????private?void?BindData()
15?????????{
16??????????????SqlConnection?cn?=?new?SqlConnection("server=(local);database=NorthWind;uid=sa;pwd=");
17??????????????string?str=@"SELECT?Employees.EmployeeID,?Orders.EmployeeID
18?????????????????????????????????FROM?Employees?INNER?JOIN
19???????????????????????Orders?ON?Employees.EmployeeID?=?Orders.EmployeeID?";
20??????????????SqlDataAdapter?sqlda?=?new?SqlDataAdapter(str,cn);
21??????????????DataSet?ds?=?new?DataSet();
22??????????????sqlda.Fill(ds);
23??????????????this.RowsCount?=?ds.Tables[0].Rows.Count;
24??????????????this.DataGrid1.DataSource?=?ds;
25??????????????this.DataGrid1.DataBind();
26}
1<asp:DataGrid?id="DataGrid1"?runat="server"?AllowPaging="True">
2????????????????????????????<Columns>
3???????????????????????????????????<asp:TemplateColumn>
4??????????????????????????????????????????<ItemTemplate>
5?????????????????????????????????????????????????<%#?RowsCount?-?DataGrid1.CurrentPageIndex?*?DataGrid1.PageSize?-?Container.ItemIndex?%>
6??????????????????????????????????????????</ItemTemplate>
7???????????????????????????????????</asp:TemplateColumn>
8????????????????????????????</Columns>
9?????????????????????</asp:DataGrid>

轉載于:https://www.cnblogs.com/xivi/archive/2005/08/22/220117.html

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