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所以这是场景 - 我首先从表transactions和v_patients. 我将该查询执行到List(Of transaction). 我操纵（Concat()、GroupBy()等）该列表，直到达到最终投影并DataBind()到达 GroupMatchListView。我在标记中有一些带有Sort命令的链接按钮。现在我需要在GroupMatchListView_Sorting对列表进行排序的事件处理程序中编写一些内容。我想我需要使用 IComparer，或者GroupMatchListView.Items.OrderBy以某种方式对 ListView 进行排序，但我很困惑。我不想运行另一个 SQL 查询并重做我的列表操作。谢谢你的帮助！

最终投影：

Dim goliath = From f In wholeResults _
                          Group f By f.v_patient Into Group _
                          Order By v_patient.last_name, v_patient.first_name, v_patient.date_of_birth _
                          Select New With {.PatientID = v_patient.patient_id, .LastName = v_patient.last_name, .FirstName = v_patient.first_name, _
                             .DOB = v_patient.date_of_birth, .Ins = v_patient.insname, .MatchCount = Group.Count(), .Matches = Group}

            GroupMatchListView.DataSource = goliath
            GroupMatchListView.DataBind()

我有一些具有排序命令的按钮：

<th id="Th4" runat="server" style="width: 100px" width="100px">
                                        <asp:LinkButton ID="SortLastNameButton" runat="server" CommandName="Sort" CommandArgument="LastName" ForeColor="White">Last Name</asp:LinkButton>
                                    </th>
                                    <th id="Th5" runat="server" style="width: 100px" width="100px">
                                        <asp:LinkButton ID="SortFirstNameButton" runat="server" CommandName="Sort" CommandArgument="FirstName" ForeColor="White">First Name</asp:LinkButton>
                                    </th>
                                    <th id="Th6" runat="server" style="width: 85px" align="center" width="85px">
                                        <asp:LinkButton ID="SortDOBButton" runat="server" CommandName="Sort" CommandArgument="DOB" ForeColor="White" ToolTip="Date of Birth">DOB</asp:LinkButton>
                                    </th>
                                    <th id="Th7" runat="server" style="width: 185px" width="185px">
                                        <asp:LinkButton ID="SortInsuranceButton" runat="server" CommandName="Sort" CommandArgument="Ins" ForeColor="White">Insurance</asp:LinkButton>
                                    </th>

我放置排序逻辑的地方：

 Protected Sub GroupMatchListView_Sorting(sender As Object, e As System.Web.UI.WebControls.ListViewSortEventArgs) Handles GroupMatchListView.Sorting
        ''
        ''Something goes here that sorts the ListView
        ''Maybe something that uses
        ''IComparer
        ''or
        ''GroupMatchListView.Items.OrderBy()
    End Sub

再次感谢。

编辑：我认为我在正确的轨道上。我采用 GroupMatchListView.Items，使用 OrderBy，并将结果分配给 List(Of ListViewDatItems)。然后我清除 GroupMatchListView.Items，并从我的 ListViewDataItems 列表中添加回项目。但是，当我返回该页面时，什么都没有改变。如果我只使用 DataBind() 我会得到一个空的 ListView。如果我将 ListViewDataItems 列表分配为 DataSource，然后是 DataBind，则会出现错误。有人知道我怎么能把它包起来吗？

这是我的工作：

    Protected Sub GroupMatchListView_Sorting(sender As Object, e As System.Web.UI.WebControls.ListViewSortEventArgs) Handles GroupMatchListView.Sorting

            Dim caesar As List(Of ListViewDataItem) = (GroupMatchListView.Items.OrderBy(Function(i) CType(i.FindControl("FirstName"), Label).Text)).ToList()

            GroupMatchListView.Items.Clear()

            For Each i As ListViewDataItem In caesar
                GroupMatchListView.Items.Add(i)
            Next

            ''I don't know what comes next.  The following does not work:
            ''GroupMatchListView.DataSource = GroupMatchListView.Items
            ''GroupMatchListView.DataBind()
        End Sub
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1 回答 1

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好吧，我不能用 GroupMatchesListView.Items 做到这一点。相反，我将之前查询的结果放入 Session 变量中。然后到了排序的时候，我把它拿出来，排序，然后发回给 Session。

这是代码：

  • 首先我把它扔进 Session

        goliath = (From f In wholeResults _
                  Group f By f.v_patient Into Group _
                  Order By v_patient.last_name, v_patient.first_name, v_patient.date_of_birth _
                  Select New With {.PatientID = v_patient.patient_id, .LastName = v_patient.last_name, .FirstName = v_patient.first_name, _
                     .DOB = v_patient.date_of_birth, .Ins = v_patient.insname, .MatchCount = Group.Count(), .Matches = Group}).ToList()

Session("ListOfMatches") = goliath
GroupMatchListView.DataSource = goliath

  • 然后我施展了我的魔法

    Protected Sub GroupMatchListView_Sorting(sender As Object, e As System.Web.UI.WebControls.ListViewSortEventArgs) 处理 GroupMatchListView.Sorting

            Dim interimMatches As IEnumerable(Of Object) = CType(Session("ListOfMatches"), IEnumerable(Of Object))

        Select Case e.SortExpression
            Case "LastName"
                If CurrentSortExpression = "LastName" Then
                    interimMatches = interimMatches.Reverse()
                Else
                    interimMatches = interimMatches.OrderBy(Function(i) CType(i.LastName, String)).ToList()
                    CurrentSortExpression = "LastName"
                End If
            Case "FirstName"
                If CurrentSortExpression = "FirstName" Then
                    interimMatches = interimMatches.Reverse()
                Else
                    interimMatches = interimMatches.OrderBy(Function(i) CType(i.FirstName, String)).ToList()
                    CurrentSortExpression = "FirstName"
                End If
            Case "DOB"
                If CurrentSortExpression = "DOB" Then
                    interimMatches = interimMatches.Reverse()
                Else
                    interimMatches = interimMatches.OrderBy(Function(i) CType(i.DOB, Date)).ToList()
                    CurrentSortExpression = "DOB"
                End If
            Case "Ins"
                If CurrentSortExpression = "Ins" Then
                    interimMatches = interimMatches.Reverse()
                Else
                    interimMatches = interimMatches.OrderBy(Function(i) CType(i.Ins, String)).ToList()
                    CurrentSortExpression = "Ins"
                End If
        End Select
        Session("ListOfMatches") = interimMatches
        ViewState("CurrentSortExpression") = CurrentSortExpression
        GroupMatchListView.DataSource = interimMatches
        GroupMatchListView.DataBind()

    End Sub

希望这可以帮助某人。

于 2012-04-23T05:06:39.257 回答