gridview 编辑模板中的下拉列表不会更新列的值

Question

所以我有一个与 sql 数据源绑定的 gridview。之后，我为一列更改了编辑模板，而不是 textBox，我使用了下拉列表。在该下拉列表中，我输入了两个项目及其值。现在，当我更新安装 dropdownlist 的 gridview 列时，不会将旧值更新为新值，而是获得 NULL 值。

这是我的代码：

<asp:GridView ID="gvNeobrađene" HorizontalAlign="Center" runat="server" AutoGenerateColumns="False" DataKeyNames="Id" DataSourceID="sdsNeobradene" CellPadding="4" ForeColor="#333333" GridLines="None" OnRowUpdating="gvNeobrađene_RowUpdating">
          <AlternatingRowStyle BackColor="White" />
          <Columns>
              <asp:BoundField DataField="Id" HeaderText="Id" InsertVisible="False" ReadOnly="True" SortExpression="Id" />
              <asp:BoundField DataField="Ime" HeaderText="Ime" SortExpression="Ime" />
              <asp:BoundField DataField="Prezime" HeaderText="Prezime" SortExpression="Prezime" />
              <asp:BoundField DataField="Email" HeaderText="Email" SortExpression="Email" />
              <asp:BoundField DataField="Telefon" HeaderText="Telefon" SortExpression="Telefon" />
              <asp:BoundField DataField="Napomena" HeaderText="Napomena" SortExpression="Napomena" />
              <asp:BoundField DataField="SeminarID" HeaderText="SeminarID" SortExpression="SeminarID" />
              <asp:BoundField DataField="TerminID" HeaderText="TerminID" SortExpression="TerminID" />
              <asp:CheckBoxField DataField="PotvrdaP" HeaderText="PotvrdaP" SortExpression="PotvrdaP" ReadOnly="false"/>
              <asp:TemplateField HeaderText="v" SortExpression="StatusP">
                  <EditItemTemplate>
                      <asp:DropDownList ID="ddlStatus" runat="server">
                          <asp:ListItem Value="Prihvaćena">Prihvaćena</asp:ListItem>
                          <asp:ListItem Value="Odbijena">Odbijena</asp:ListItem>
                      </asp:DropDownList>
                  </EditItemTemplate>
                  <ItemTemplate>
                      <asp:Label ID="Label1" runat="server" Text='<%# Bind("StatusP") %>'></asp:Label>
                  </ItemTemplate>
              </asp:TemplateField>
              <asp:CommandField ButtonType="Button" CancelText="Odustani" DeleteText="Izbriši" EditText="Uredi" InsertText="Ubaci" NewText="Novo" SelectText="Odaberi" ShowEditButton="True" ShowHeader="True" UpdateText="Spremi" ShowDeleteButton="True" />
          </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>
      <asp:SqlDataSource ID="sdsNeobradene" runat="server" ConflictDetection="CompareAllValues" ConnectionString="<%$ ConnectionStrings:SeminarBazaConnectionString %>" 
          DeleteCommand="DELETE FROM [Predbiljezba] WHERE [Id] = @original_Id AND [Ime] = @original_Ime AND [Prezime] = @original_Prezime AND [Email] = @original_Email AND [Telefon] = @original_Telefon AND (([Napomena] = @original_Napomena) OR ([Napomena] IS NULL AND @original_Napomena IS NULL)) AND [SeminarID] = @original_SeminarID AND [TerminID] = @original_TerminID AND [PotvrdaP] = @original_PotvrdaP AND (([StatusP] = @original_StatusP) OR ([StatusP] IS NULL AND @original_StatusP IS NULL))" InsertCommand="INSERT INTO [Predbiljezba] ([Ime], [Prezime], [Email], [Telefon], [Napomena], [SeminarID], [TerminID], [PotvrdaP], [StatusP]) VALUES (@Ime, @Prezime, @Email, @Telefon, @Napomena, @SeminarID, @TerminID, @PotvrdaP, @StatusP)" OldValuesParameterFormatString="original_{0}" 
          SelectCommand="SELECT * FROM [Predbiljezba] WHERE ([PotvrdaP] = @PotvrdaP)" 
          UpdateCommand="UPDATE [Predbiljezba] SET [Ime] = @Ime, [Prezime] = @Prezime, [Email] = @Email, [Telefon] = @Telefon, [Napomena] = @Napomena, [SeminarID] = @SeminarID, [TerminID] = @TerminID, [PotvrdaP] = @PotvrdaP, [StatusP] = @StatusP WHERE [Id] = @original_Id">
          <DeleteParameters>
              <asp:Parameter Name="original_Id" Type="Int32" />
              <asp:Parameter Name="original_Ime" Type="String" />
              <asp:Parameter Name="original_Prezime" Type="String" />
              <asp:Parameter Name="original_Email" Type="String" />
              <asp:Parameter Name="original_Telefon" Type="String" />
              <asp:Parameter Name="original_Napomena" Type="String" />
              <asp:Parameter Name="original_SeminarID" Type="Int32" />
              <asp:Parameter Name="original_TerminID" Type="Int32" />
              <asp:Parameter Name="original_PotvrdaP" Type="Boolean" />
              <asp:Parameter Name="original_StatusP" Type="String" />
          </DeleteParameters>
          <InsertParameters>
              <asp:Parameter Name="Ime" Type="String" />
              <asp:Parameter Name="Prezime" Type="String" />
              <asp:Parameter Name="Email" Type="String" />
              <asp:Parameter Name="Telefon" Type="String" />
              <asp:Parameter Name="Napomena" Type="String" />
              <asp:Parameter Name="SeminarID" Type="Int32" />
              <asp:Parameter Name="TerminID" Type="Int32" />
              <asp:Parameter Name="PotvrdaP" Type="Boolean" />
              <asp:Parameter Name="StatusP" Type="String" />
          </InsertParameters>
          <SelectParameters>
              <asp:Parameter DefaultValue="False" Name="PotvrdaP" Type="Boolean" />
          </SelectParameters>
          <UpdateParameters>
              <asp:Parameter Name="Ime" Type="String" />
              <asp:Parameter Name="Prezime" Type="String" />
              <asp:Parameter Name="Email" Type="String" />
              <asp:Parameter Name="Telefon" Type="String" />
              <asp:Parameter Name="Napomena" Type="String" />
              <asp:Parameter Name="SeminarID" Type="Int32" />
              <asp:Parameter Name="TerminID" Type="Int32" />
              <asp:Parameter Name="PotvrdaP" Type="Boolean" />
              <asp:Parameter Name="StatusP" Type="String" />
              <asp:Parameter Name="original_Id" Type="Int32" />
              <asp:Parameter Name="original_Ime" Type="String" />
              <asp:Parameter Name="original_Prezime" Type="String" />
              <asp:Parameter Name="original_Email" Type="String" />
              <asp:Parameter Name="original_Telefon" Type="String" />
              <asp:Parameter Name="original_Napomena" Type="String" />
              <asp:Parameter Name="original_SeminarID" Type="Int32" />
              <asp:Parameter Name="original_TerminID" Type="Int32" />
              <asp:Parameter Name="original_PotvrdaP" Type="Boolean" />
              <asp:Parameter Name="original_StatusP" Type="String" />
          </UpdateParameters>
      </asp:SqlDataSource>

还有什么我需要改变的东西才能起作用吗？

Answer 1

您需要绑定您的DropDownList 到您的数据库字段

<asp:DropDownList ID="ddlStatus" runat="server"
    SelectedValue='<%# Bind("StatusP") %>'>
    <asp:ListItem Value="">None</asp:ListItem>
    <asp:ListItem Value="Prihvaćena">Prihvaćena</asp:ListItem>
    <asp:ListItem Value="Odbijena">Odbijena</asp:ListItem>
</asp:DropDownList>

关键部分是

SelectedValue='<%# Bind("StatusP") %>'

这将导致您选择的值传递给您的数据源。