asp.net listview和findcontrol

我有listview，我需要將列表視圖中的下拉列表綁定到將使用函數BindPages（）構建的ListItemCollection。當我點擊AddNew Link時，我無法綁定下拉菜單。asp.net listview和findcontrol

<asp:ListView DataKeyNames="Menuid" OnItemCommand="lvParentMenus_ItemCommand" OnSorting="lvParentMenus_Sorting" 
         OnDataBound="lvParentMenus_DataBound" DataSourceID="SqlDataSource1" ID="lvParentMenus" 
         runat="server"> 
         <LayoutTemplate> 
          <table border="0" id="listview" width="100%" class="grid" cellpadding="0" cellspacing="0"> 
           <thead> 
            <tr class="listingheader "> 
             <td width="10%" style="text-align: center; !important"> 
              <input type="checkbox" name="checkbox" id="headercheck" /> 
             </td> 
             <td id="thsno" runat="server"> 
              <asp:LinkButton ID="LinkButton1" runat="server" CommandName="Sort" CommandArgument="Sno" 
               Text="Sno" /> 
             </td> 
             <td id="thmenutext" runat="server"> 
              <asp:LinkButton runat="server" ID="LinkButton2" Text="Menu Text" CommandName="Sort" 
               CommandArgument="MenuText" /> 
             </td> 
             <td id="thmenuurl" runat="server"> 
              <asp:LinkButton runat="server" ID="LinkButton3" Text="Menu Url" CommandName="Sort" 
               CommandArgument="MenuUrl" /> 
             </td> 
             <td id="thlevel" runat="server"> 
              <asp:LinkButton runat="server" ID="LinkButton4" Text="Level of Display" CommandName="Sort" 
               CommandArgument="level" /> 
             </td> 
             <td> 
              Action 
             </td> 
            </tr> 
           </thead> 
           <tbody> 
            <tr runat="server" id="itemPlaceholder"> 
            </tr> 
           </tbody> 
           <tfoot> 
            <tr> 
             <td colspan="3" align="center"> 
              <asp:Label ID="lblMessage" Text="dfdfdfd" runat="server"></asp:Label> 
             </td> 
             <td align="right"> 
              <asp:LinkButton Text="Add New" ID="lnkNew" CommandName="FillDropDown" runat="server" 
               Font-Bold="true" OnClick="AddNew"></asp:LinkButton> 
             </td> 
            </tr> 
           </tfoot> 
          </table> 
<ItemTemplate> 
          <tr class='<%# Container.DataItemIndex % 2 == 0 ? "lrow1" : "lrow1 altrow" %>'> 
           <td class="col1" align="center"> 
            <asp:CheckBox runat="server" ID="chkitem"></asp:CheckBox> 
           </td> 
           <td class="lrow1"> 
            <%# Eval("Sno")%> 
            <asp:HiddenField ID="hdnStoreID" runat="server" Value='<%# Eval("MenuId") %>' /> 
           </td> 
           <td> 
            <%# Eval("MenuText")%> 
           </td> 
           <td> 
            <asp:DropDownList ID="ddlPagesList" runat="server" DataSource='<%#BindPages()%>'> 
            </asp:DropDownList> 
           </td> 
           <td> 
            <asp:DropDownList ID="ddlLevel" runat="server" DataSource='<%#BindLevel(6)%>' SelectedValue='<%# Eval("level")%>'> 
            </asp:DropDownList> 
           </td> 
           <td nowrap="nowrap"> 
            <asp:LinkButton ID="lnkEdit" runat="server" CommandName="Edit">Edit</asp:LinkButton> 
            | 
            <asp:LinkButton ID="lnkdelete" runat="server" CommandName="Delete" OnClientClick="javascript:return confirm('Are you sure to delete the current item');">Delete</asp:LinkButton> 
           </td> 
          </tr> 
         </ItemTemplate> 

<InsertItemTemplate> 
          <tr class="lrow1"> 
           <td class="col1" align="center"> 
            &nbsp; 
           </td> 
           <td class="lrow1"> 
            &nbsp; 
           </td> 
           <td class="lrow1"> 
            <asp:TextBox ID="txtMenuText" runat="server" Width="80px" Text='<%# Eval("MenuText")%>' 
             CssClass="inputbox" ValidationGroup="InsertFields" /> 
            <asp:RequiredFieldValidator ID="reqValidCity" ControlToValidate="txtMenuText" runat="server" 
             ErrorMessage="City Name is required." Display="Dynamic" ValidationGroup="InsertFields">*</asp:RequiredFieldValidator> 
            <asp:RegularExpressionValidator ID="regValidCity" runat="server" ErrorMessage="Please Enter Alphabets only." 
             Display="Dynamic" ValidationGroup="g1" ControlToValidate="txtMenuText" ValidationExpression="^[a-zA-Z0-9\s]{2,1000}"></asp:RegularExpressionValidator> 
           </td> 
           <td> 
            <asp:DropDownList ID="ddlPagesList" runat="server" DataSource='<%#BindPages()%>'> 
            </asp:DropDownList> 
           </td> 
           <td> 
            <asp:DropDownList ID="ddlLevel" runat="server" DataSourceID="sdsLevel" DataValueField="level" 
             DataTextField="level"> 
            </asp:DropDownList> 
           </td> 
           <td nowrap="nowrap"> 
            <asp:LinkButton ID="lnkinsert" runat="server" OnClick="lnkinsert_Click" ValidationGroup="InsertFields"> Insert</asp:LinkButton> 
           </td> 
          </tr> 
         </InsertItemTemplate> 

</asp:ListView> 
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" SelectCommand="usp_getParentMenus" 
         SelectCommandType="StoredProcedure"> 
         <SelectParameters> 
          <asp:ControlParameter ControlID="ddlRoles" Name="intRoleid" PropertyName="Text" DefaultValue="1" 
           ConvertEmptyStringToNull="true" Direction="Input" /> 
         </SelectParameters> 
        </asp:SqlDataSource>

，這裏是方法BindPAges（）

protected ListItemCollection BindPages() 
{ 
    string sDir = Request.PhysicalApplicationPath; 

    if (FirstCount == 0) 
     DirSearch(sDir); 

    return collection; 
}

當我試圖找到在的AddNew的ddlPageList（）方法時拋出錯誤「對象和借鑑未設置」

ADDNEW （）方法： `protected void AddNew（object sender，EventArgs e） {

lvParentMenus.InsertItemPosition = InsertItemPosition.FirstItem; 
    lvParentMenus.FindControl("lnkNew").Visible = false; 
    lvParentMenus.EditIndex = -1; 

    sdsLevel.ConnectionString = DBConnectionString.ConnectionString; 
    Parameter a = new Parameter("intRoleid", DbType.Int32); 
    a.DefaultValue = ddlRoles.SelectedValue.ToString(); 
    sdsLevel.SelectParameters.Add(a); 
    sdsLevel.SelectCommand = "usp_getParentMenus"; 

    DropDownList ddlpages = (DropDownList)lvParentMenus.FindControl("ddlPagesList"); 
    string sDir = Request.PhysicalApplicationPath; 

    DirSearch(sDir); 
    ddlpages.DataSource = collection;

ddlpages.DataBind（）; }

In the image after clicking on the new link button I need to bind the dropdown to the list of pages in the dirctory.But it is not coming.

迫切需要。謝謝。

來源

2011-07-01 Anand Kumar M

請嘗試

DropDownList ddlpages = (DropDownList)lvParentMenus.Items[0].FindControl("ddlPagesList");

來源

2011-07-01 11:52:28 Saurabh

我找到了引用，但無法將列表綁定到下拉列表。它不是雙向的。 –

您是否嘗試過在列表視圖使用RUNAT =服務器屬性表？

來源

2011-07-28 08:37:41 ethem

asp.net listview和findcontrol

回答

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