Dropdown-Liste in der Gridview-Bearbeitungsvorlage aktualisiert den Wert der Spalte

Question

Ich habe also eine Gridview, die mit einer SQL-Datenquelle begrenzt ist. Danach habe ich eine Bearbeitungsvorlage für eine Spalte geändert und anstelle von textBox eine Dropdown-Liste verwendet. In dieser Dropdown-Liste habe ich zwei Elemente und ihre Werte eingegeben. Wenn ich jetzt eine Gridview-Spalte aktualisiere, in der ich die Dropdown-Liste installiert habe, wird der alte Wert nicht auf seinen neuen Wert aktualisiert, sondern erhält einen NULL-Wert.

Dies ist mein Code:

<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> 

Gibt es andere Sachen, die ich ändern müssen, so könnte dies umgehen?

Answer 1

Sie müssen Bind Ihr DropDownList auf Ihr Datenbankfeld

<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> 

Der wichtigste Teil ist

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

Dies wird den Wert, den Sie verursacht auswählen, um Ihre Datenquelle zu übergeben.