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I was able to create a beautiful, four generation nested datalist (Parent, Child, GrandChild, GreatGrandChild) using a DataSet populated at Page_Load from a sub called Data_Binder(). I'm very pleased with how quickly and correctly the data displays.

However, when I click on the Edit button in my GreatGrandChild DataList, the info which should show in the EditItemTemplate completely disappears rather than allowing me to edit. This is what it looks like at the initial display: 

Jul 2013
Stat Forecast Sales Brand
100           116   Drop 80 % 
Testing Insert
Part Number Mix DP Adj SP
8521150 30% 8    8 Edit
8521148 20% 5    5 Edit
8523458 10% 3    3 Edit
8524400 7%  2    2 Edit
8524276 6%  2    2 Edit
8523165 6%  2    2 Edit
8523985 5%  1  2 3 Edit
8523456 5%  1    1 Edit
8524403 4%  1    1 Edit
8524399 4%  1    1 Edit
8523987 3%  1    1 Edit
8524402 1%  0    0 Edit

Clicking Edit makes it become this:

Jul 2013
Stat Forecast Sales Brand
100           116   Drop 80 % 
Testing Insert

I'm including my GetChildRelation, Data_Binder, and Edit_Command subs so you can see what is triggering as well as my GreatGrandChild DataList. For brevity, I'm not including the HeaderTemplate and ItemTemplate as those are working just fine.

I would like to continue to use this DataSet method as the speed of presenting the data is fantastic.

Any suggestions?

Thanks,
Rob

Nested DataList snippet...

<asp:DataList ID="DL_Supply_Plan_Date_Numbers_SP" runat="server" 
    CssClass="DP_DL_Supply_Plan_Date_Numbers_SP" 
    OnEditCommand="Edit_Command"
    OnUpdateCommand="Update_Command"
    OnCancelCommand="Cancel_Command"
    DataSource='<%# GetChildRelation(Container.DataItem, "Fam_Date_GrandChild")%>'
    >
    <HeaderTemplate> ... </HeaderTemplate>
    <ItemTemplate> ... </ItemTemplate>
    <EditItemTemplate>

        <asp:Label ID="lbl_dat_DP_Date_Numbers_hidden" runat="server" CssClass="hidden" 
            Text='<%#Container.DataItem("dat_DP_Date")%>' />
        <asp:Label ID="lbl_txt_Part_Num_hidden" runat="server" CssClass="hidden" 
            Text='<%#Container.DataItem("txt_Part_Num")%>' />

        <asp:Label ID="lbl_txt_Family_Part_Num" runat="server" CssClass="SP_Family_Member"
            Text='<%#DataBinder.Eval(Container.DataItem,"txt_Family_Part_Num")%>' />
        <asp:Label ID="lbl_num_Mix_Weight" runat="server" CssClass="SP_Family_Member SP_Mix"
            Text='<%#DataBinder.Eval(Container.DataItem,"num_Mix_Weight","{0:0%}")%>' />
        <asp:Label ID="lbl_DP_Unconstrained" runat="server" CssClass="SP_Family_Member SP_Mix DP"
            Text='<%# Display_Supply_Plan(Eval("num_Mix_Weight"),Eval("num_DP_Number"),Eval("num_Brand_Number"),0) %>' />
        <asp:TextBox ID="tbx_num_SP_Adjust" runat="server" CssClass="SP_Family_Member SP_Mix SP-Adjust"
            Text='<%#DataBinder.Eval(Container.DataItem,"num_SP_Adjust")%>' />
        <asp:Label ID="lbl_SP" runat="server" CssClass="SP_Family_Member SP_Mix SP"
            Text='<%# Display_Supply_Plan(Eval("num_Mix_Weight"),Eval("num_DP_Number"),Eval("num_Brand_Number"),Eval("num_SP_Adjust")) %>' />
        <br />
        <asp:LinkButton ID="lnkUpdate" runat="server" CommandName="update">Update</asp:LinkButton>
        &nbsp;&nbsp;
        <asp:LinkButton ID="lnkCancel" runat="server" CommandName="cancel">Cancel</asp:LinkButton>

    </EditItemTemplate>
</asp:DataList>

CODE BEHIND...

Protected Function GetChildRelation(dataItem As Object, relation As String) As DataView
    Dim drv As DataRowView = TryCast(dataItem, DataRowView)
    If drv IsNot Nothing Then
        Return drv.CreateChildView(relation)
    Else
        Return Nothing
    End If
End Function

Sub Data_Binder()

    Dim strConn As String = System.Configuration.ConfigurationManager.ConnectionStrings("TestConnectionString").ConnectionString

    Dim Cat_Fam_Filter As String = "Where txt_Family_Category Like '" & ddl_Family_Category_Name.SelectedValue & "' " _
                                    & "and txt_Family_Name Like '" & ddl_Family_Name.SelectedValue & "'"

    Dim strSql As String = "SELECT * FROM tbl_Family " & Cat_Fam_Filter & " Order By txt_Family_Category, txt_Family_Name ; " _
                           & "SELECT * FROM func_Display_Demand_Plan() " & Cat_Fam_Filter & " Order by dat_DP_Date; " _
                           & "SELECT * FROM func_Display_Demand_Plan() " & Cat_Fam_Filter & " Order by dat_DP_Date; " _
                           & "SELECT * FROM func_Display_Supply_Plan() " & Cat_Fam_Filter & " " _
                           & "order by dat_DP_Date, num_Mix_Weight DESC "

    Dim conn As New SqlConnection(strConn)
    Dim da As New SqlDataAdapter(strSql, conn)
    da.TableMappings.Add("Family1", "Dates")
    da.TableMappings.Add("Family2", "Demand")
    da.TableMappings.Add("Family3", "Supply")

    _ds = New DataSet()

    da.Fill(_ds, "Family")

    _ds.Relations.Add("Fam_Date_Parent", _ds.Tables("Family").Columns("txt_Family_Name"), _ds.Tables("Dates").Columns("txt_Family_Name"))
    _ds.Relations(0).Nested = True
    _ds.Relations.Add("Fam_Date_Child", _ds.Tables("Dates").Columns("FamDateKey"), _ds.Tables("Demand").Columns("FamDateKey"))
    _ds.Relations(1).Nested = True
    _ds.Relations.Add("Fam_Date_GrandChild", _ds.Tables("Demand").Columns("FamDateKey"), _ds.Tables("Supply").Columns("FamDateKey"), False)
    _ds.Relations(2).Nested = True

    DL_Supply_Plan.DataSource = _ds.Tables("Family")
    DL_Supply_Plan.DataBind()


End Sub

Sub Edit_Command(sender As Object, e As DataListCommandEventArgs)

    Dim DL_Target As DataList = DirectCast(sender, DataList)

    DL_Target.EditItemIndex = e.Item.ItemIndex
    DL_Target.DataBind()

End Sub
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1 回答 1

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由于 GreatGrandChild 是通过 DataSource 使用 GrandChild 数据列表中的 Container.DataItem 填充的，因此任何仅对 GreatGrandChild DataList 进行数据绑定的尝试都将是空的。我没有填充整个 DataView 以获得适当的 DataRowView。

我的解决方案：为 Parent、Child 和 GrandChild 创建一个 DataSet，然后为 GreatGrandChild 创建一个单独的 DataSet。GreatGrandChild 现在通过 GrandChild 的 OnItemDataBound 事件填充以用于显示目的。然后，我也可以对 Edit、Cancel 和 Update/Insert 事件使用相同的 DataBind。它是独立的并且运行良好。

于 2013-07-22T21:01:05.673 回答