今天犯的一个错误，学得到不少东西，哈哈

从前面往后面写：
ascx:

 1 < asp:datagrid id = " grdTopics "  Runat = " server "  GridLines = " None "  CellPadding = " 2 "  AutoGenerateColumns = " false "
 2     width = " 100% "  cssclass = " DataGrid_Container " >
 3      < FooterStyle CssClass = " DataGrid_Footer " ></ FooterStyle >
 4      < SelectedItemStyle CssClass = " NormalRed " ></ SelectedItemStyle >
 5      < EditItemStyle CssClass = " NormalTextBox " ></ EditItemStyle >
 6      < AlternatingItemStyle CssClass = " Normal " ></ AlternatingItemStyle >
 7      < ItemStyle HorizontalAlign = " Left "  CssClass = " Normal " ></ ItemStyle >
 8      < HeaderStyle HorizontalAlign = " Center "  CssClass = " NormalBold "  VerticalAlign = " Top " ></ HeaderStyle >
 9      < Columns >
10          < asp:TemplateColumn HeaderText = " Selected " >
11              < ItemTemplate >
12                  < input type = " checkbox "  width = " 10 "  name = " chkid "  value = ' <%# DataBinder.Eval(Container.DataItem, "TopicID")%> '  onclick = ' UnCheck(this) '   style = " background-color:transparent "   >
13              </ ItemTemplate >
14          </ asp:TemplateColumn >
15          < dnn:TextColumn HeaderText = " TopicId "  DataField = " TopicId "  Width = " 50 " >
16              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Left " ></ HeaderStyle >
17              < ItemStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  HorizontalAlign = " Left " ></ ItemStyle >
18              < HeaderTemplate ></ HeaderTemplate >
19              < ItemTemplate ></ ItemTemplate >
20              < EditItemTemplate ></ EditItemTemplate >
21          </ dnn:TextColumn >
22          < dnn:TextColumn HeaderText = " Title "  DataField = " inTitle "  Width = "" >
23              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Left " ></ HeaderStyle >
24              < ItemStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  HorizontalAlign = " Left " ></ ItemStyle >
25              < HeaderTemplate ></ HeaderTemplate >
26              < ItemTemplate ></ ItemTemplate >
27              < EditItemTemplate ></ EditItemTemplate >
28          </ dnn:TextColumn >
29          < dnn:TextColumn HeaderText = " Summary "  DataField = " inSummary "  Width = " 50 " >
30              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Left " ></ HeaderStyle >
31              < ItemStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  HorizontalAlign = " Left " ></ ItemStyle >
32              < HeaderTemplate ></ HeaderTemplate >
33              < ItemTemplate ></ ItemTemplate >
34              < EditItemTemplate ></ EditItemTemplate >
35          </ dnn:TextColumn >
36          < dnn:TextColumn HeaderText = " Guests "  DataField = " inGuests "  Width = "" >
37              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Left " ></ HeaderStyle >
38              < ItemStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  HorizontalAlign = " Left " ></ ItemStyle >
39              < HeaderTemplate ></ HeaderTemplate >
40              < ItemTemplate ></ ItemTemplate >
41              < EditItemTemplate ></ EditItemTemplate >
42          </ dnn:TextColumn >
43          < dnn:TextColumn HeaderText = " Time "  DataField = " inTime "  Width = "" >
44              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Left " ></ HeaderStyle >
45              < ItemStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  HorizontalAlign = " Left " ></ ItemStyle >
46              < HeaderTemplate ></ HeaderTemplate >
47              < ItemTemplate ></ ItemTemplate >
48              < EditItemTemplate ></ EditItemTemplate >
49          </ dnn:TextColumn >
50          < dnn:TextColumn HeaderText = " ImgUrl "  DataField = " inImgUrl "  Width = "" >
51              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Left " ></ HeaderStyle >
52              < ItemStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  HorizontalAlign = " Left " ></ ItemStyle >
53              < HeaderTemplate ></ HeaderTemplate >
54              < ItemTemplate ></ ItemTemplate >
55              < EditItemTemplate ></ EditItemTemplate >
56          </ dnn:TextColumn >
57          < dnn:ImageCommandColumn KeyField = " TopicId "  ShowImage = " True "  ImageURL = " images/edit.gif "  CommandName = " Edit "
58             EditMode = " URL " >
59              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Center " ></ HeaderStyle >
60              < EditItemTemplate ></ EditItemTemplate >
61              < ItemStyle HorizontalAlign = " Center " ></ ItemStyle >
62              < HeaderTemplate ></ HeaderTemplate >
63              < ItemTemplate ></ ItemTemplate >
64          </ dnn:ImageCommandColumn >
65          < dnn:ImageCommandColumn KeyField = " TopicId "  ShowImage = " True "  ImageURL = " images/delete.gif "  CommandName = " Delete "
66             EditMode = " Command " >
67              < HeaderStyle Font - Size = " 10pt "  Font - Names = " Tahoma, Verdana, Arial "  Font - Bold = " True "  HorizontalAlign = " Center " ></ HeaderStyle >
68              < EditItemTemplate ></ EditItemTemplate >
69              < ItemStyle HorizontalAlign = " Center " ></ ItemStyle >
70              < HeaderTemplate ></ HeaderTemplate >
71              < ItemTemplate ></ ItemTemplate >
72          </ dnn:ImageCommandColumn >
73      </ Columns >
74      < PagerStyle CssClass = " DataGrid_Pager " ></ PagerStyle >
75 </ asp:datagrid >

这里没怎么出问题，
下面就有问题了：
.ascx.cs:

 1 private   void  BindData()
 2          {
 3
 8            ChatRoomController ctl1 = new ChatRoomController();
 9            TopicsInfo info1 = ctl1.GetTopics(this.ModuleId);//这里得到所有的topic，数组形式，调试时可以将info1里面的内容输出：
                  TopicInfo aa = (TopicInfo)info1.Topics[0];
                  Response.Write(info1.Count.ToString() +aa.inTitle);
26            this.grdTopics.DataSource = info1.Topics;
28            this.grdTopics.DataBind();
29            this.BindPages();
30            this.ProessButton();
31        }

最大的错误出现在controller里面：

 1 public  TopicsInfo GetTopics( int  ModuleID)
 2          {
 3            TopicsInfo info1 = new TopicsInfo();
 4            ArrayList list1 = new ArrayList();
 5            IDataReader reader1 = DataProvider.Instance().GetTopics(ModuleID);
 6            reader1.Read();
 7            int num1 = Convert.ToInt32(RuntimeHelpers.GetObjectValue(reader1[0]));
 8            reader1.NextResult();
 9            list1 = CBO.FillCollection(reader1, typeof(TopicInfo));
10            info1.Count = num1;
11            info1.Topics = list1;
12            return info1;
13        }

由于对 IDataReader reader1 = DataProvider.Instance().GetTopics(ModuleID);   reader1.Read();
不熟悉，所以犯错误了， 现在详细的认识一下这个idatareader :
       通过存储过程gettopic读出来所有的数据库中的数据，reader[0]是第一个数组中的内容。
reader1.NextResult();读下一个数组。
num1得到了reader[0]，即topic的个数（在存储过程里面很清楚，一共select了两个数据，一个是topic个数，一个是topic的内容）
然后 info1.count = num1。
info1.topics = list1（即reader读的第二条数据 reader1.NextResult()，topic的内容）

以下是存储过程：

 1 SELECT   COUNT ( [ TopicId ] )
 2          FROM  dbo.HVC_ChatRoom_TopicsList
 3      WHERE  ModuleID  =   @ModuleID
 4     
 5      SELECT
 6         TopicId,
 7         inTitle,
 8         inSummary,
 9         inTime,
10         inGuests
11      FROM  {databaseOwner}{objectQualifier}HVC_ChatRoom_TopicsList
12      WHERE  ModuleID  =   @ModuleID