bind dropdownlist返回空值

我將數據庫中的數據綁定到gridview組合框值。以下是gridview和rowdatabound事件的編碼部分。bind dropdownlist返回空值

<asp:GridView ID="workingdaygrid" runat="server" 
      onrowdeleting="branchgrid_RowDeleting" 
      onrowediting="branchgrid_RowEditing" 
      onrowcancelingedit="branchgrid_RowCancelingEdit" 
      onrowupdating="branchgrid_RowUpdating" DataKeyNames="Workingday_id" 
      onpageindexchanged="workingdaygrid_PageIndexChanged" AllowPaging="True" 
      CellPadding="4" ForeColor="#333333" GridLines="None" 
      AutoGenerateColumns="False" onrowdatabound="workingdaygrid_RowDataBound"> 
     <AlternatingRowStyle BackColor="White" /> 
     <Columns> 
      <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" CancelImageUrl="~/images/Cancel.jpg" 
           DeleteImageUrl="~/images/delete.jpg" EditImageUrl="~/images/Edit.jpg" 

           UpdateImageUrl="~/images/update.jpg" ButtonType="Image"/> 
      <asp:BoundField DataField="Workingday_id" HeaderText="WorkingDayID" /> 
      <asp:BoundField DataField="Working_date" HeaderText="WorkingDayID" /> 
      <asp:BoundField DataField="Working_day" HeaderText="WorkingDayID" /> 
      <asp:TemplateField HeaderText="WorkingdayType"> 
      <ItemTemplate> 
      <asp:Label runat="server" Text='<%# Eval("Workingday_type") %>'></asp:Label></ItemTemplate> 
      <EditItemTemplate> 
      <asp:DropDownList ID="Workingdaytype" runat="server" Width="100px"> 
      </asp:DropDownList> 
      </EditItemTemplate> 
      </asp:TemplateField> 
     </Columns> 
     <EditRowStyle BackColor="#2461BF" /> 
     <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> 
     <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> 
     <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" /> 
     <RowStyle BackColor="#EFF3FB" /> 
     <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" /> 
     <SortedAscendingCellStyle BackColor="#F5F7FB" /> 
     <SortedAscendingHeaderStyle BackColor="#6D95E1" /> 
     <SortedDescendingCellStyle BackColor="#E9EBEF" /> 
     <SortedDescendingHeaderStyle BackColor="#4870BE" /> 
    </asp:GridView>

和行數據綁定事件代碼是

protected void workingdaygrid_RowDataBound(object sender, GridViewRowEventArgs e) 
     { 
      if (e.Row.RowType == DataControlRowType.DataRow) 
      { 

       DropDownList dl = (DropDownList)e.Row.FindControl("Workingdaytype"); 
       DataTable worktype = inter.bindworkdaytype(); 
       dl.DataSource = worktype; 
       dl.DataTextField = "Workingday_type"; 
       dl.DataValueField = "Time_id"; 
       dl.DataBind(); 

      } 
     }

在follwing線運行它使用defugger（F11）以下行 DropDownList的DL =（DropDownList的）e.Row時返回空值。的FindControl（「Workingdaytype」）;

來源

2013-07-26 baskaran

你看過這篇文章嗎？ http://stackoverflow.com/questions/8573260/cant-find-dropdown-list-in-rowdatabound-event –

...和另一個使用RowDataBound（）而不是RowEditing（）的例子：http://stackoverflow.com /問題/ 833490/gridview的行編輯動態綁定到一個-下拉列表 –

DropDownList位於EditItemTemplate中，因此它僅在網格處於編輯模式時可用。更改代碼：

if (e.Row.RowType == DataControlRowType.DataRow)

這樣：

if (e.Row.RowType == DataControlRowType.DataRow && workingdaygrid.EditIndex > -1)

，它應該工作。

來源

2013-07-26 20:43:23 afzalulh

bind dropdownlist返回空值

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