維護GridView中的分頁排序

我目前正在嘗試編寫代碼，以便在更改GridView上的頁面時保持排序首選項。我目前的代碼工作正常，基於用戶排序選擇對數據進行排序。但是當更改頁面時，排序不起作用。我沒有遇到錯誤，但沒有得到任何結果。維護GridView中的分頁排序

這裏是我的aspx代碼：

<asp:GridView ID="tblAdministrators" runat="server" AutoGenerateColumns="false" EmptyDataText="No records found" PageSize="75" AllowPaging="True" AllowSorting="True"> 

    <Columns> 
    <asp:BoundField HeaderText="Name" InsertVisible="False" DataField="FULLNAME" SortExpression="FULLNAME"></asp:BoundField> 
    </Columns> 
    <Columns> 
    <asp:BoundField HeaderText="Active" InsertVisible="False" DataField="ACTIVE" SortExpression="ACTIVE"></asp:BoundField> 
    </Columns> 

</asp:GridView>

這裏是我的VB代碼：

Public Class ViewUsers 
Inherits SolutionBasePage 

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 

    If Not Page.IsPostBack Then 
     tblAdministrators.DataSource = GetData() 
     tblAdministrators.DataBind() 
    End If 

End Sub 

Private Const ASCENDING As String = " ASC" 
Private Const DESCENDING As String = " DESC" 

Private Function GetData() As Data.DataView 

    Dim connection As OracleDBConnect = DAL.GetOracleDBConnection() 
    Dim request As OracleDBRequest = Nothing 
    Dim result As OracleDBResult = Nothing 
    Dim trace As OracleDBChronoTrace = Nothing 
    Dim status As DBStatus 
    Dim sb As New StringBuilder 
    Dim dv As DataView 
    Dim ds As Data.DataSet = New Data.DataSet 

    Try 

     With sb 
      .Append("SELECT FULLNAME, ACTIVE FROM USERS") 
     End With 

     request = New OracleDBRequest(sb.ToString, CommandType.Text) 

     status = connection.Execute(request, result, trace) 

     dv = New DataView(result.DataSet.Tables(0)) 

     If (ViewState("sortExp") IsNot Nothing) Then 
      dv = New Data.DataView(result.DataSet.Tables(0)) 

      If (GridViewSortDirection = SortDirection.Ascending) Then 
       GridViewSortDirection = SortDirection.Descending 
       dv.Sort = CType(ViewState("sortExp") & DESCENDING, String) 
      Else 
       GridViewSortDirection = SortDirection.Ascending 
       dv.Sort = CType(ViewState("sortExp") & ASCENDING, String) 
      End If 
     Else 
      dv = result.DataSet.Tables(0).DefaultView 
     End If 

     Return dv 

    Catch ex As Exception 

    Finally 
     'ds.Dispose() 
     'dp.Dispose() 
    End Try 

End Function 

Public Property GridViewSortDirection() As SortDirection 
    Get 
     If ViewState("sortDir") Is Nothing Then 
      ViewState("sortDir") = SortDirection.Ascending 
     End If 

     Return CType(ViewState("sortDir"), SortDirection) 
    End Get 

    Set(ByVal value As SortDirection) 
     ViewState("sortDir") = value 
    End Set 

End Property 


Protected Sub tblAdministrators_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles tblAdministrators.PageIndexChanging 

    tblAdministrators.PageIndex = e.NewPageIndex 
    tblAdministrators.DataSource = GetData() 
    tblAdministrators.DataBind() 

End Sub 


Protected Sub tblAdministrators_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles tblAdministrators.Sorting 

    ViewState("sortExp") = e.SortExpression 
    tblAdministrators.DataSource = GetData() 
    tblAdministrators.DataBind() 

End Sub 

End Class

來源

2012-09-28 Mark Marina

嘗試進入代碼並查看PageIndexChanging上的ViewState（「sortExp」）的值是什麼。這應該給你一個線索。 –

感謝您的提示。當我從第1頁到第2頁時，排序是「升序」，然後是2到3，它是「降級」。排序不保留。所以我的代碼真的有問題了！ –

的問題是當你調用GetData（）函數，你的代碼更改數據視圖的排序的屬性，即使它由PageIndexChaging事件調用。

If (GridViewSortDirection = SortDirection.Ascending) Then 
    GridViewSortDirection = SortDirection.Descending 
    dv.Sort = CType(ViewState("sortExp") & DESCENDING, String) 
Else 
    GridViewSortDirection = SortDirection.Ascending 
    dv.Sort = CType(ViewState("sortExp") & ASCENDING, String) 
End If

您可以修改您的GetData（）函數以接受SortDirection。然後，在您的tblAdministrators_PageIndexChanging和tblAdministrators_Sorting事件中，只需傳遞GridViewSortDirection即可。例如：

Private Function GetData(sort As SortDirection) As Data.DataView 
' your code here... 
End Function 

Protected Sub tblAdministrators_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles tblAdministrators.PageIndexChanging 
    tblAdministrators.PageIndex = e.NewPageIndex 
    tblAdministrators.DataSource = GetData(GridViewSortDirection) 
    tblAdministrators.DataBind() 
End Sub 

Protected Sub tblAdministrators_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles tblAdministrators.Sorting 
    ViewState("sortExp") = e.SortExpression 
    GridViewSortDirection = If(GridViewSortDirection = SortDirection.Descending, SortDirection.Ascending, SortDirection.Descending) 
    tblAdministrators.DataSource = GetData(GridViewSortDirection) 
    tblAdministrators.DataBind() 
End Sub

來源

2012-09-28 20:42:48

維護GridView中的分頁排序

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