利用Session纪录datagrid模板列中CheckBox的状态

    技术2022-05-11  12

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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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