datalist的手写代码更新记录的怪问题?
昨天做 "datalist的手写代码更新记录 "的时候遇到一个难题:就是运行后更改了数据按了更新按钮,数据还是没有更
改,找了一个下午也没能找出那里错了,试过在protected void DataList1_UpdateCommand(object source,
DataListCommandEventArgs e)事件的最后一个花括号}处加了一个断点来调试(也就是说在55行加了一个断点),发
现string Score =(( TextBox)e.Item.FindControl( "TextBox1 ")).Text和string Comment = ((TextBox)
e.Item.FindControl( "TextBox2 ")).Text的值是原来没有更新之前的值,而不是更新之后的值,真的很奇怪!请各位
帮忙看一下错在那里.
075010.aspx
1 <%@ Page Language= "C# " AutoEventWireup= "true " CodeFile= "070510.aspx.cs " Inherits= "_070510 " %>
2
3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN "
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
4
5 <html xmlns= "http://www.w3.org/1999/xhtml " >
6 <head runat= "server ">
7 <title> Untitled Page </title>
8 </head>
9 <body>
10 <form id= "form1 " runat= "server ">
11 <div>
12 <asp:DataList ID= "DataList1 " runat= "server " OnCancelCommand= "DataList1_CancelCommand "
OnEditCommand= "DataList1_EditCommand " OnUpdateCommand= "DataList1_UpdateCommand ">
13 <ItemTemplate>
14 <asp:LinkButton ID= "LinkButton1 " runat= "server " CommandName= "edit "> 修改
</asp:LinkButton>
15
16 <asp:LinkButton ID= "LinkButton2 " runat= "server " CommandName= "delete "> 删除
</asp:LinkButton>
17
18 <%# Eval( "HomeworkID ")%>
19
20 <%# Eval( "HScore ")%>
21
22 <%# Eval( "HComment ")%>
23 </ItemTemplate>
24 <EditItemTemplate>
25 <asp:LinkButton ID= "LinkButton1 " runat= "server " CommandName= "update "> 更新
</asp:LinkButton>
26
27 <asp:LinkButton ID= "LinkButton2 " runat= "server " CommandName= "cancel "> 删除
</asp:LinkButton>
28
29 <%# Eval( "HomeworkID ")%>
30
31 <asp:TextBox ID= "TextBox1 " runat= "server " Text= ' <%# Eval( "HScore ")%
> '> </asp:TextBox>
32 <asp:TextBox ID= "TextBox2 " runat= "server " Text= ' <%# Eval( "HComment ")%
> '> </asp:TextBox>
33
34 </EditItemTemplate>
35 </asp:DataList>
36
37 </div>
38 </form>
39 </body>
40 </html>
41
070510.aspx.cs
1using System;
2using System.Data;
3using System.Configuration;
4using System.Collections;
5using System.Web;
6using System.Web.Security;
7using System.Web.UI;
8using System.Web.UI.WebControls;
9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11using System.Data.OleDb;
12
13public partial class _070510 : System.Web.UI.Page
14{
15
16 private void bind()
17 {
18 OleDbConnection conn = new OleDbConnection(ConfigurationSettings.AppSettings[ "connstr "]);
19 OleDbCommand comm = new OleDbCommand( "select * from Homework ", conn);
20 OleDbDataAdapter da = new OleDbDataAdapter(comm);
21 DataSet ds = new DataSet();
22 da.Fill(ds);
23 DataList1.DataSource = ds;
24 DataList1.DataKeyField = "HomeworkID ";
25 DataList1.DataBind();
26 }
27 protected void Page_Load(object sender, EventArgs e)
28 {
29 bind();
30 }
31
32 protected void DataList1_CancelCommand(object source, DataListCommandEventArgs e)
33 {
34 DataList1.EditItemIndex = -1;
35 bind();
36 }
37 protected void DataList1_EditCommand(object source, DataListCommandEventArgs e)
38 {
39 DataList1.EditItemIndex = e.Item.ItemIndex;
40 bind();
41 }
42 protected void DataList1_UpdateCommand(object source, DataListCommandEventArgs e)
43 {
44 int HomeworkID=Convert.ToInt32( DataList1.DataKeys[e.Item.ItemIndex]);
45 string Score =(( TextBox)e.Item.FindControl( "TextBox1 ")).Text;
46 string Comment = ((TextBox)e.Item.FindControl( "TextBox2 ")).Text;
47 OleDbConnection conn = new OleDbConnection(ConfigurationSettings.AppSettings[ "connstr "]);
48 string updateString = "update Homework set HScore= ' "+ Score+ " ',HComment= ' "+Comment+ " 'where
HomeworkID= "+HomeworkID+ " ";
49 conn.Open();
50 OleDbCommand comm = new OleDbCommand(updateString, conn);
51 comm.ExecuteNonQuery();
52 conn.Close();
53 DataList1.EditItemIndex = -1;
54 bind();
55 }
56}
57
[解决办法]
改为
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
bind();
}
试试
[解决办法]
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
bind();
}
