在C＃中的asp.net gridview模板字段中找到dropdownlist

Question

所以我有這個gridview如下所示：

<asp:GridView ID="gridDetaljiNarudzbe" AutoGenerateColumns="false" AllowPaging="true" PageSize="10" runat="server" OnRowCommand="gridDetaljiNarudzbe_RowCommand" OnPageIndexChanging="gridDetaljiNarudzbe_PageIndexChanging" OnRowDataBound="gridDetaljiNarudzbe_RowDataBound">
    <Columns>
       <asp:BoundField DataField="Naziv" HeaderText="Naziv" />
       <asp:BoundField DataField="Sifra" HeaderText="Šifra" />
       <asp:BoundField DataField="Cijena" HeaderText="Cijena" />
       <asp:BoundField DataField="Kolicina" HeaderText="Količina" />
            <asp:TemplateField HeaderText="Ocjena">
            <ItemTemplate>
                <asp:DropDownList  ID="DropDownList1" runat="server"></asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
      <asp:TemplateField>
          <ItemTemplate> 
              <asp:LinkButton ID="btnOcijeni" title="Ocijeni proizvod" CommandName="OcijeniCommand" CommandArgument='<%# Eval("ProizvodID") %>' runat="server"><img src="../images/ocijeni.png" /></asp:LinkButton>
          </ItemTemplate>
      </asp:TemplateField>
    </Columns>
</asp:GridView>

我想知道有什么方法可以訪問此下拉列表並用數據填充它。 我嘗試了以下代碼，但是它們都不起作用，所有返回的錯誤“對象引用未設置為實例”：

      DropDownList drop =  gridDetaljiNarudzbe.FindControl("DropDownList1") as DropDownList;

然后，我將執行以下操作： drop.Items.Add(new ListItem("test"));

我也嘗試過使用RowDataBound事件，但是它也沒有起作用...

DropDownList droplist = e.Row.FindControl("DropDownList1") as DropDownList;

然后使用以下代碼填充網格，只是為了測試它是否有效：

drop.Items.Add(new ListItem("test"));

但是這些都不起作用...我還想知道如何從該下拉列表中獲取值，並在有人從中獲取東西時將其插入數據庫。 有人可以幫我這個忙嗎？

Answer 1

這應該做

foreach (GridViewRow gr in gridDetaljiNarudzbe.Rows)
{
    DropDownList drop =  gr.FindControl("DropDownList1") as DropDownList;
    drop.Items.Add(new ListItem("test"));
}

或者如果您想在RowDataBound事件中執行此操作

protected void gridDetaljiNarudzbe_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DropDownList drop =  e.Row.FindControl("DropDownList1") as DropDownList;
        drop.Items.Add(new ListItem("test"));
    }
}