在Asp.Net中單擊GridView上的更新時獲取下拉列表的實例

我有一個包含30列以上的GridView。大多數是普通的控件，但對於一些我添加了模板控件（DropDownList，Calendar和CheckBox控件）。這裏是有問題的控件的aspx代碼在Asp.Net中單擊GridView上的更新時獲取下拉列表的實例

 <asp:TemplateField HeaderText="Field1 Caption" SortExpression="Field1"> 
     <ItemTemplate> 
      <asp:Label ID="lblConstructionArea" runat="server" Text='<%# Eval("Field1") %>'></asp:Label> 
     </ItemTemplate> 
     <EditItemTemplate> 
       <asp:DropDownList ID="ddlField1" EnableViewState="true" runat="server"></asp:DropDownList> 
      </EditItemTemplate> 
     </asp:TemplateField>

我希望在用戶點擊編輯時在列上顯示下拉列表。因此，我添加此代碼（和上述EditItemTemplate中）

protected void gvData_RowEditing(object sender, GridViewEditEventArgs e) 
    { 
     string fieldOne = CommonUtils.ExtractControlValue(e,"lblField1",gvData); 

     gvData.SelectedIndex = e.NewEditIndex; 
     gvData.EditIndex = e.NewEditIndex; 
     gvData.DataBind(); 

     BindGridDropDownData(e, CommonUtils.GetConstructionAreas() ,"ddlConstructionArea", constructionArea, "Field1", fieldOne); 
    }

在上面的代碼我正在當前可用並將它傳遞給另一種方法，以便顯示下拉時，能夠準確地示出的選擇的索引。這之後，我做了下拉列表的變化上，並點擊GridView的「更新按鈕」和下面的事件被觸發

protected void gvData_RowUpdating(object sender, GridViewUpdateEventArgs e) 
    { 
     int rowEditIndex = e.RowIndex; 
     GridViewRow gRow = gvData.Rows[rowEditIndex]; 


     DropDownList ddlConstructionArea = (DropDownList) gvData.Rows[rowEditIndex].FindControl("ddlConstructionArea"); //This does not work 

     ddlConstructionArea = (DropDownList)gRow.FindControl("ddlConstructionArea");//This does not work 

     ddlConstructionArea = (DropDownList)gvData.Rows[rowEditIndex].Cells[7].FindControl("ddlConstructionArea");//this does not work either 
     gvData.EditIndex = -1;//this works and the text boxes disappear 
     gvData.DataBind();//this works and the old data shows up on the gridview 
    }

我很好奇，如何做一個網格，我有一個更新綁定是運行時。

來源

2012-11-08 vikramjb