用VB在ASP.Net中对GridView中的事件进行排序

<asp:GridView ID="GridView1" runat="server" AllowSorting="True" OnSorting="GridView1_Sorting">
    <Columns>
        <asp:BoundField DataField="ProductName" HeaderText="Product Name" SortExpression="ProductName" />
        <asp:BoundField DataField="UnitPrice" HeaderText="Unit Price" SortExpression="UnitPrice" />
        <asp:BoundField DataField="UnitsInStock" HeaderText="Units In Stock" SortExpression="UnitsInStock" />
    </Columns>
</asp:GridView>

Protected Sub GridView1_Sorting(sender As Object, e As GridViewSortEventArgs) Handles GridView1.Sorting
    Dim dataTable As DataTable = TryCast(GridView1.DataSource, DataTable)
    If dataTable IsNot Nothing Then
        Dim dataView As DataView = dataTable.DefaultView
        dataView.Sort = e.SortExpression & " " & ConvertSortDirectionToSql(e.SortDirection)
        GridView1.DataSource = dataView
        GridView1.DataBind()
    End If
End Sub

Private Function ConvertSortDirectionToSql(sortDirection As SortDirection) As String
    Return If(sortDirection = SortDirection.Ascending, "ASC", "DESC")
End Function