[Resolved] GridView Sorting Problems

I have a GridView where I am using BoundFields. When I click sorting on a bound data field, it gives me error:

An unhandled exception of type 'System.StackOverflowException' occurred in System.Web.dll. Make sure you do not have an infinite loop.

Code:

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Protected Sub GridView1_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs)

        Dim expression As String = e.SortExpression
        Dim direction As SortDirection = SortDirection.AscendingOrder

        GridView1.Sort(expression, direction)
        GridView1.DataSource = mySqlDataSet
        GridView1.DataBind()

End Sub

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Code:

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<asp:GridView ID="GridView1" runat="server" Height="505px" Style="z-index: 10; left: -7px;
            position: absolute; top: 85px; border-right: gray thin solid; border-top: gray thin solid; border-left: gray thin solid; border-bottom: gray thin solid;" Width="902px" AllowPaging="True" AllowSorting="True" Font-Size="Small" PageSize="15" AutoGenerateColumns="False" CellSpacing="2" HorizontalAlign="Left" BorderColor="LightGray" BorderStyle="None"
            onSorting="GridView1_Sorting" onrowcommand="GridView1_RowCommand">
            <PagerSettings PageButtonCount="15" />
            <RowStyle Height="6px" />
            <HeaderStyle BackColor="#FFE0C0" Height="6px" HorizontalAlign="Left" VerticalAlign="Middle" />
            <AlternatingRowStyle BackColor="#FFFFC0" />
            <Columns>
                <asp:CommandField HeaderText="Select" SelectText="Ticket" ShowSelectButton="True" />
                <asp:BoundField DataField="job_date" DataFormatString="{0:d}" HeaderText="Job Date" SortExpression="JobDate" >
                    <ItemStyle Font-Size="Small" HorizontalAlign="Left" />
                </asp:BoundField>
                <asp:BoundField DataField="job_number" HeaderText="Job Number" SortExpression="JobNmber" />
                <asp:BoundField DataField="cost_code" HeaderText="Cost Code" SortExpression="CostCode" />
                <asp:BoundField DataField="qty_delivered" HeaderText="Qty Delivered - Asphalt" ReadOnly="True">
                    <ItemStyle HorizontalAlign="Right" Width="120px" />
                    <HeaderStyle Wrap="False" />
                </asp:BoundField>
                <asp:BoundField DataField="qty_received" HeaderText="Qty Received - Job">
                    <ItemStyle HorizontalAlign="Right" Width="120px" />
                </asp:BoundField>
                <asp:BoundField DataField="qty_used" HeaderText="Qty Used - Job">
                    <ItemStyle HorizontalAlign="Right" Width="120px" />
                </asp:BoundField>
                <asp:BoundField DataField="qty_wasted" HeaderText="Qty Wasted - Job">
                    <ItemStyle HorizontalAlign="Right" Width="120px" />
                </asp:BoundField>
                <asp:BoundField DataField="plant_id" HeaderText="Plant Id" SortExpression="PlantId" />
            </Columns>
            <SelectedRowStyle BackColor="White" />
</asp:GridView>

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Code:

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Protected Sub GridView1_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs)

        Dim expression As String = e.SortExpression
        Dim direction As SortDirection = SortDirection.AscendingOrder

        GridView1.Sort(expression, direction)
        GridView1.DataSource = mySqlDataSet
        GridView1.DataBind()

End Sub

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That line is calling the method that it is in. Unfortunately, I don't have a databound website set up in asp.net right now that I can find the verbage you need. But that is the line causing the infinite loop.

OK, I understand. So I have changed the code to:

Code:

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Protected Sub GridView1_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs)

        GridView1.DataSource = mySqlDataSet.Tables("JobListTable")
        GridView1.DataBind()
       
End Sub

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When I debug I see that the "sortexpression" passed in is correct. From here I am not able to make the grid sort on the expression.

My reading has been (http://msdn.microsoft.com/en-us/library/hwf94875.aspx)

At run time, users can click the LinkButton control in a column heading to sort by that column. Clicking the link causes the page to perform a postback and raises the GridView control's Sorting event. The sort expression — by default, the name of the data column — is passed as part of the event arguments. The default behavior for the Sorting event is that the GridView control passes the sort expression to the data source control. The data source control executes its selection query or method, including the sort parameters passed by the grid.

Here is the code that will let me do sorting:

Code:

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Private Property GridViewSortDirection() As String
        Get
            Return IIf(ViewState("SortDirection") = Nothing, "ASC", ViewState("SortDirection"))
        End Get
        Set(ByVal value As String)
            ViewState("SortDirection") = value
        End Set
    End Property

    Private Property GridViewSortExpression() As String
        Get
            Return IIf(ViewState("SortExpression") = Nothing, String.Empty, ViewState("SortExpression"))
        End Get
        Set(ByVal value As String)
            ViewState("SortExpression") = value
        End Set
    End Property

    Private Function GetSortDirection() As String
        Select Case GridViewSortDirection
            Case "ASC"
                GridViewSortDirection = "DESC"
            Case "DESC"
                GridViewSortDirection = "ASC"
        End Select
        Return GridViewSortDirection

    End Function

    Protected Sub gridViewPublishers_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs)
        GridView1.DataSource = SortDataTable(GridView1.DataSource, True)
        GridView1.PageIndex = e.NewPageIndex
        GridView1.DataBind()

    End Sub

    Protected Function SortDataTable(ByVal dataTable As Data.DataTable, ByVal isPageIndexChanging As Boolean) As Data.DataView
        If Not dataTable Is Nothing Then
            Dim dataView As New Data.DataView(dataTable)
            If GridViewSortExpression <> String.Empty Then
                If isPageIndexChanging Then
                    dataView.Sort = String.Format("{0} {1}", GridViewSortExpression, GridViewSortDirection)
                Else
                    dataView.Sort = String.Format("{0} {1}", GridViewSortExpression, GetSortDirection())
                End If
            End If
            Return dataView
        Else
            Return New Data.DataView()
        End If
    End Function

    Protected Sub gridView1_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
        GridViewSortExpression = e.SortExpression
        CreateTextFile()
        AdsArrays()
        ReadAdsTables()
        FillTempTable()
        GridView1.DataSource = mySqlDataSet.Tables("JobListTable")
        Dim pageIndex As Integer = GridView1.PageIndex
        GridView1.DataSource = SortDataTable(GridView1.DataSource, False)
        GridView1.DataBind()
        GridView1.PageIndex = pageIndex
    End Sub

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