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利用Session纪录datagrid模板列中CheckBox的状态

技术2022-05-11  2


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datagrid 的模板列中加入CheckBox ,如果对datagrid设置分页,前一页已经选中的CheckBox在回到原页时,CheckBox的状态会变为初始状态。

       如果想保存CheckBox的状态,则可以用Session保存,我是这样实现的:

      1、首先,建立datagrid.

         <asp:datagrid id="datagrid1" style="Z-INDEX: 101; LEFT: 12px; POSITION: absolute; TOP: 88px" runat="server" AllowPaging="True" Width="416px" Height="248px">

                   <AlternatingItemStyle BackColor="#EEEEEE"></AlternatingItemStyle>

                   <ItemStyle Font-Size="12px" Font-Names="宋体"></ItemStyle>

                   <HeaderStyle Font-Size="12px" Font-Names="宋体" BackColor="#00CCFF"></HeaderStyle>

                   <FooterStyle HorizontalAlign="Center"></FooterStyle>

                   <Columns>

                        <asp:TemplateColumn>

                            <ItemTemplate>

                                 <asp:CheckBox id="CheckBox1" runat="server"></asp:CheckBox>

                            </ItemTemplate>

                        </asp:TemplateColumn>

                   </Columns>

              </asp:datagrid>

 

             2、在Global.asax文件中,Session_Start事件中建立Session

Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)                ' 在会话启动时激发            Dim checks As Boolean() = New Boolean(10000) {}            Dim i As Integer            For i = 0 To 10000                checks(i) = False            Next           Session.Add("CheckBoxchecks", checks)        End Sub

3.在datagrid的PageIndexChanged事件中:

 Private Sub datagrid1_PageIndexChanged(ByVal source As Object, ByVal e As System.Web.UI.WebControls.datagridPageChangedEventArgs) Handles datagrid1.PageIndexChanged

        Dim count As Integer

        Dim cnn As OleDb.OleDbConnection = New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:UserLog.mdb")

        Dim da As New OleDb.OleDbDataAdapter("select * from mm", cnn)

 

        da.Fill(dst)

 

        count = dst.Tables(0).Rows.Count   'datagrid中的记录总数;

        Dim check As Boolean()

        check = Me.Session("CheckBoxchecks")  'check()是记录CheckBox状态的数组,用Session保存。

                   Dim j As Integer

            For j = 0 To datagrid1.PageSize - 1

                Dim Che As CheckBox = datagrid1.Items(j).Cells(0).FindControl("CheckBox1")

                If Not Che Is Nothing Then

                    If Che.Checked = True Then

                        check(datagrid1.CurrentPageIndex * datagrid1.PageSize + j) = True

                    Else

                        check(datagrid1.CurrentPageIndex * datagrid1.PageSize + j) = False

                    End If

                End If

            Next

        datagrid1.CurrentPageIndex = e.NewPageIndex

        Dim ds As New DataSet()

        da.Fill(ds, "a")

        datagrid1.DataSource = ds

        datagrid1.DataBind()

            Dim i As Integer

            For i = 0 To datagrid1.PageSize - 1

                Dim Cx2 As CheckBox = datagrid1.Items(i).Cells(0).FindControl("CheckBox1")

                If check(datagrid1.CurrentPageIndex * datagrid1.PageSize + i) = True Then

                    Cx2.Checked = True

                Else

                    Cx2.Checked = False

                End If

            Next

         

         End Sub

          这样就可以利用Session实现CheckBox翻页后的状态保存问题.

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