GridView用数据源控件和用DataTable作为数据源的不同

1.使用数据源控件可以自动做排序分页，不需要多余代码，可是由于自动绑定太多操作，反而觉得很不灵活

前台：

<asp:GridViewID="gv_test"DataSourceID="ds_test"AllowPaging="True" PageSize="10"runat="server">

...

</asp:GridView>

<asp:SqlDataSource  runat="server" ID="ds_test" SelectCommand="select * from test" ConnectionString="...">

2.使用DataTable为数据源会发现排序，分页包括修改，取消等操作都需要手动实现

前台：

 <asp:GridView ID="gv_test"  runat="server" 
            OnRowCommand="gv_test_RowCommand"  OnRowUpdating="gv_test_RowUpdating"  OnRowEditing ="gv_test_RowEditing"
            OnRowCancelingEdit ="gv_test_RowCancelingEdit" OnPageIndexChanging ="gv_test_PageIndexChanging"  
            AllowPaging="True"  PageSize="10" AllowSorting="True" >

...

</asp:GridView >

后台：
Page_Load: gv_test.SortExpression总是为空，只好将排序字符串储存在新建的属性里
gv_test.Attributes.Add("Sort", "lastUpdateDate desc")



 
Protected Sub bind()


   gv_test.DataSource = getDataTable_bySQL("select * from test order by "+gv_test.Attributes("Sort"))
   gv_test.DataBind()
End Sub

DataView比DatatTable功能强大些，可以拿到数据后进行排序。当SQL Server的ntext列不支持order by时候，用DataView可以解决问题，如下：
Protected Sub bind()

   gv_test.DataSource = getDataTable_bySQL("select * from test")
   Dim dv As DataView = New DataView(getTableData_bySQL("select * from test"))
   

   
   dv.Sort=gv_test.Attributes("Sort")
   gv_test.DataSource=dv
   gv_test.DataBind()

End Sub


    Protected Sub gv_test_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs) Handles gv_test.Sorting
        gv_test.EditIndex = -1
        If gv_test.Attributes("Sort") = e.SortExpression + " desc" Then
            gv_test.Attributes("Sort") = e.SortExpression
        Else
            gv_test.Attributes("Sort") = e.SortExpression + " desc"
        End If
        bind()
    End Sub
    Protected Sub gv_test_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs)
        gv_test.PageIndex = e.NewPageIndex
        gv_test.EditIndex = -1
        bind()
    End Sub
    Protected Sub gv_test_RowCancelingEdit(ByVal sender As System.Object, ByVal e As System.Web.UI.WebControls.GridViewCancelEditEventArgs)
        gv_test.EditIndex = -1
        bind()
    End Sub
    Protected Sub gv_test_RowUpdating(ByVal sender As System.Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles gv_test.RowUpdating
        gv_test.EditIndex = -1
    End Sub
    Public Sub gv_test_RowEditing(ByVal sender As System.Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs)
        gv_test.EditIndex = e.NewEditIndex
        bind()
    End Sub