对使用自定义投影进行数据绑定的ASP.NET ListView进行排序

下面是一个场景——我从查询表

transactions

和

v_患者

中的数据开始。我对一个

列表（事务）

执行该查询。我操纵（

Concat（）

，

GroupBy（）

，等等）该列表，直到到达最终投影，并将

DataBind（）

映射到GroupMatchListView。我在标记中有一些链接按钮，它们具有

Sort

命令。现在我需要在对列表排序的

GroupMatchListView\u Sorting

事件处理程序中编写一些内容。我想我需要使用IComparer或

GroupMatchListView.Items.OrderBy

对列表视图进行排序，但我很困惑。我不想运行另一个SQL查询并重做列表操作。谢谢你的帮助

最后预测：

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()

我有一些带有排序命令的按钮：

<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>

再次感谢

编辑：我想我走对了。我采用GroupMatchListView.Items，使用OrderBy，并将结果分配给一个列表（ListViewDatItems）。然后清除GroupMatchListView.Items，并将这些项从ListViewDataItems列表中添加回来。然而，当我回到页面时，一切都没有改变。如果只使用DataBind（），则会得到一个空的ListView。如果将ListViewDataItems列表指定为数据源，然后指定为DataBind，则会出现错误。有人知道我该怎么结束吗

以下是我得出的结论：

    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

---

嗯，我不能用GroupMatchesListView.Items来完成。相反，我将先前查询的结果放入会话变量中。然后，当需要排序时，我将其取出，排序，并将其发送回会话

代码如下：

• 首先，我把它投入到会话中

      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
  受保护的子组MatchListView_排序（发件人作为对象，e作为System.Web.UI.WebControl.ListViewSortEventArgs）处理组MatchListView.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
  

希望这对别人有帮助

        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