Repeater item 获取不到dropdownlist的值

Question

aspx文件<table width="100%" border="0" cellpadding="3" cellspacing="1" class="MainTable" id="BoardTable" >
  <tr class="MainTableHeader">
    <td colspan="5">版块管理</td>
          </tr>
                        <tr>
            <td colspan="5">
                &nbsp;&nbsp;<asp:Label ID="AddActLink" runat="server" Text="Label"></asp:Label>&nbsp;<asp:Label ID="RepairSortLink" runat="server" Text="Label"></asp:Label>
                            </td>
            </tr>
              <tr>
            <td colspan="5" height="4px" ></td>
            </tr>
        <asp:Repeater ID="BoardRepeater" runat="server"  onitemcommand="BoardRepeater_ItemCommand" >
        <HeaderTemplate>
            <tr>
            <td>基本操作</td>
            <td>+ 版块名称</td>
            <td>类型</td>
            <td>高级操作</td>
            <td>动作</td>
            </tr>
        </HeaderTemplate>
         <ItemTemplate> 
        <tr>
            <td ><asp:Label ID="LowActLink" runat="server">Label</asp:Label></td>
            <td ><asp:Label ID="LabelSplitStr" runat="server" >Label</asp:Label><asp:TextBox ID="BoardActLink" runat="server"></asp:TextBox><asp:HiddenField ID="LbBoardId" runat="server" /> </td>
            <td ><asp:DropDownList ID="ddlKindModel" runat="server" ></asp:DropDownList><asp:DropDownList ID="ddlKindNameId" runat="server" ></asp:DropDownList></td>
            <td ><asp:Label ID="HighActLink" runat="server">Label</asp:Label></td>
            <td ><asp:Button ID="UpdateButton" runat="server" Text="更 新" CommandName ="UpdateButton_Click"/></td>
        </tr>
    </ItemTemplate>
       </asp:Repeater>
       <tr>
            <td colspan="5" height="4px" ></td>
            </tr>
</table>CS文件
protected void BoardRepeater_ItemCommand(object source, RepeaterCommandEventArgs e)
{
 if (e.CommandName.Equals("UpdateButton_Click"))
        {
            TextBox BoardActLink = (TextBox)e.Item.FindControl("BoardActLink");//OK可以找到值
            HiddenField LbBoardId = (HiddenField)e.Item.FindControl("LbBoardId");//OK可以找到值
            DropDownList ddlKindModel = (DropDownList)e.Item.FindControl("ddlKindModel"); //DropDownList就是不行
            //DropDownList ddlKindNameId = (DropDownList)e.Item.FindControl("ddlKindNameId");
            ModBoard = BLL_Admin_Board.GetBoardModel("BoardId=" +Convert.ToInt32(LbBoardId.Value));
            ModBoard.KindModel = Convert.ToInt32(ddlKindModel.SelectedValue);
            //ModBoard.KindNameId = Convert.ToInt32(ddlKindNameId.Text);
            ModBoard.BoardName = BoardActLink.Text;
            BLL_Admin_Board.BoardEdit(ModBoard);
            Response.Write("  <script> alert( '" + ddlKindModel.Text + " '); </script>  ");
        }
} DropDownList ddlKindModel = (DropDownList)e.Item.FindControl("ddlKindModel"); //DropDownList就是不行老是count为0

Answer 1

if(!IsPostBack)   
  { BindData();}
<asp:repeater id="Repeater1" runat="server" onitemdatabound="Repeater1_ItemDataBound">  
  <itemtemplate>  
  <div>  
  <asp:dropdownlist id="ddl" autopostback="true" onselectedindexchanged="myDrop_SelectedIndexChanged" runat="server"> </asp:dropdownlist>  
  </div>  
  </itemtemplate>  
  </asp:repeater>  protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)  
  {  
  if (e.Item.ItemType == ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem||e.Item.ItemType==ListItemType.EditItem)  
  {  
  DropDownList myDrop = e.Item.FindControl("ddl") as DropDownList;  
  }  
  }    protected void myDrop_SelectedIndexChanged(object sender,EventArgs e)  
  {  
  Response.Write(((DropDownList)sender).SelectedIndex.ToString());  
  }  

Answer 2

你都没有为DropDownList初始化，他当然count为0了，你在页面加载前先初始化一下！

Answer 3

 if (e.CommandName.Equals("UpdateButton_Click"))
要是点   "更新"  这个按钮时才触发去找这行所有控制的值<item>
  Texbox Texbox DropDownList  按钮
</item>
点按钮时该行的TextBoxt可以，但DropDownList获取不到值。