datagrid分頁問題（前後跳頁）《控制項版繼承usercontrol》

把它定義在使用者控制項中的。在。ASCX中寫的。

在CSDN上看了很多的DATAGRID分頁問題，當然DATAGRID有自己的分頁項，功能是很有限的，我也在CSDN上看了很多自己分頁的代碼，發現都是用C#寫的，我寫了一個用ASP。NET中VB語言寫的。以下代碼供大家參考。

HTML代碼：

<%@ Control Language="vb" AutoEventWireup="false" Codebehind="DataGridPage.ascx.vb" Inherits="datagridfenye.DataGridPage" TargetSchema="http://schemas.microsoft.com/intellisense/ie5" %>
<LINK href="../css/style.css" type="text/css" rel="stylesheet">
<FONT face="MS UI Gothic"></FONT>
<asp:panel id="divPanel" ForeColor="Blue" CssClass="font2" HorizontalAlign="Left" Width="84.16%"
 runat="server" Visible="True">
<asp:Button id="btnNavFirst" runat="server" BorderStyle="Ridge" Text="初頁" CommandName="FIRST"
  BorderWidth="1px" CausesValidation="False" BackColor="#E0E0E0" Font-Size="XX-Small"></asp:Button>
<asp:Button id="btnNavPrevious" runat="server" BorderStyle="Ridge" Text="前頁" CommandName="PREVIOUS"
  BorderWidth="1px" CausesValidation="False" BackColor="#E0E0E0" Font-Size="XX-Small"></asp:Button>
<asp:Button id="btnNavNext" runat="server" BorderStyle="Ridge" Text="次頁" CommandName="NEXT"
  BorderWidth="1px" CausesValidation="False" BackColor="#E0E0E0" Font-Size="XX-Small"></asp:Button>
<asp:Button id="btnNavLast" runat="server" BorderStyle="Ridge" Text="末頁" CommandName="LAST"
  BorderWidth="1px" CausesValidation="False" BackColor="#E0E0E0" Font-Size="XX-Small"></asp:Button><INPUT id="hdRowCount" style="WIDTH: 43px; HEIGHT: 22px" type="hidden" size="1" name="Hidden1"
  runat="server"> <INPUT id="hdCurrentIndex" style="WIDTH: 48px; HEIGHT: 22px" type="hidden" size="2" value="0"
  name="Hidden1" runat="server">
<asp:Label id="LabelMsg" ForeColor="Blue" Width="232px" runat="server"></asp:Label>GOTO
<asp:TextBox id="tbPage" Width="31px" runat="server"></asp:TextBox>
<asp:Label id="LabelMsg2" ForeColor="Blue" runat="server">頁</asp:Label>
<asp:Button id="btnNavGo" runat="server" BorderStyle="Ridge" Text="確定" CommandName="GO" BorderWidth="1px"
  CausesValidation="False" BackColor="#E0E0E0" Font-Size="XX-Small"></asp:Button></asp:panel>

WEB代碼：

Imports System
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Web
Imports System.Web.UI.WebControls
Imports System.Web.UI.HtmlControls
Public Delegate Sub BindDataDelegate()
Public Class DataGridPage

    Inherits System.Web.UI.UserControl

#Region " Web フォーム デザイナで產生されたコード "

    'この呼び出しは Web フォーム デザイナで必要です。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

    End Sub

    Public binddata1 As BindDataDelegate
    Private _dg As DataGrid
    Private _autohidden As Boolean = True
    Private _pagesize As Integer = 10
    Private _itemcount As Integer = 0
    Private _dispStyle As Integer = 1
    Protected WithEvents LabelMsg As System.Web.UI.WebControls.Label
    Protected WithEvents btnNavFirst As System.Web.UI.WebControls.Button
    Protected WithEvents btnNavPrevious As System.Web.UI.WebControls.Button
    Protected WithEvents btnNavNext As System.Web.UI.WebControls.Button
    Protected WithEvents btnNavLast As System.Web.UI.WebControls.Button
    Protected WithEvents tbPage As System.Web.UI.WebControls.TextBox
    Protected WithEvents LabelMsg2 As System.Web.UI.WebControls.Label
    Protected WithEvents btnNavGo As System.Web.UI.WebControls.Button
    Protected WithEvents divPanel As System.Web.UI.WebControls.Panel
    Protected WithEvents hdRowCount As System.Web.UI.HtmlControls.HtmlInputHidden
    Protected WithEvents hdCurrentIndex As System.Web.UI.HtmlControls.HtmlInputHidden

    'メモ : 次のプレースホルダ宣言は Web フォーム デザイナで必要です。
    '削除および移動しないでください。
    Private designerPlaceholderDeclaration As System.Object

    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
        ' CODEGEN: このメソッド呼び出しは Web フォーム デザイナで必要です。
        ' コード エディタを使って変更しないでください。
        InitializeComponent()
        AddHandler Me.Load, AddressOf Page_Load

    End Sub

#End Region

    Public Property Target() As DataGrid

        Get
            Return _dg
        End Get
        Set(ByVal Value As DataGrid)
            _dg = Value
        End Set
    End Property
    Public Property AutoHidden() As Boolean

        Get
            Return _autohidden
        End Get
        Set(ByVal Value As Boolean)
            _autohidden = Value
        End Set
    End Property

    Public Property PageSize() As Integer

        Get
            Return _pagesize
        End Get
        Set(ByVal Value As Integer)
            _pagesize = Value
        End Set
    End Property
    Public Property ItemCount() As Integer

        Get
            Return _itemcount
        End Get
        Set(ByVal Value As Integer)
            _itemcount = Value
        End Set
    End Property

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        ' ページを初期化するユーザー コードをここに挿入します。

    End Sub
    Public Sub SetTarget(ByVal adg As DataGrid, ByRef aBindData1 As BindDataDelegate)

        _dg = adg

        binddata1 = aBindData1

        AddHandler btnNavFirst.Click, AddressOf NavigationButtonClick
        AddHandler btnNavPrevious.Click, AddressOf NavigationButtonClick
        AddHandler btnNavNext.Click, AddressOf NavigationButtonClick
        AddHandler btnNavLast.Click, AddressOf NavigationButtonClick
        AddHandler btnNavGo.Click, AddressOf NavigationButtonClick
        AddHandler _dg.DataBinding, AddressOf zxDataBinding
        binddata1()
    End Sub
    Public Sub SetStyle(ByVal aPageSize As Integer, ByVal aAutoHidden As Boolean, ByVal aDispStyle As Integer)

        _pagesize = aPageSize
        _autohidden = aAutoHidden
        _dispStyle = aDispStyle

        divPanel.Visible = Not aAutoHidden
    End Sub
    Public Sub SetStyle(ByVal aPageSize As Integer, ByVal aAutoHidden As Boolean)
        SetStyle(aPageSize, aAutoHidden, 1)
    End Sub
    Public Sub SetStyle(ByVal aPageSize As Integer)
        SetStyle(aPageSize, True)
    End Sub
    Public Sub NavigationButtonClick(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim direction As String
        direction = sender.CommandName

        Select Case (direction.ToUpper())

            Case ("FIRST")
                _dg.CurrentPageIndex = 0

            Case ("PREVIOUS")
                _dg.CurrentPageIndex = Math.Max(_dg.CurrentPageIndex - 1, 0)

            Case ("NEXT")
                _dg.CurrentPageIndex = Math.Min(_dg.CurrentPageIndex + 1, _dg.PageCount - 1)

            Case ("LAST")
                _dg.CurrentPageIndex = Math.Max(_dg.PageCount - 1, 0)

            Case ("GO")
                Try
                    _dg.CurrentPageIndex = Math.Min(_dg.PageCount - 1, CInt(tbPage.Text) - 1)
                    tbPage.Text = ""
                Catch
                    tbPage.Text = ""
                End Try

        End Select

        binddata1()

    End Sub
    Public Sub zxDataBinding(ByVal sender As Object, ByVal e As System.EventArgs)

        Dim newCount As Integer = 0
        Dim PageCount As Integer = 0

        If (_dg.DataSource Is "null") Then

            SetButtonState(0)
            Exit Sub
        End If
        If (_dg.DataSource.GetType().ToString().ToLower() = "system.data.datatable") Then

            newCount = _dg.DataSource.Rows.Count

        ElseIf (_dg.DataSource.GetType().ToString().ToLower() = "system.data.dataview") Then

            newCount = _dg.DataSource.Count

        ElseIf (_dg.DataSource.GetType().ToString().ToLower() = "system.data.dataset") Then

            newCount = _dg.DataSource.Tables(0).Rows.Count
        End If

        If (newCount > 0) Then
            PageCount = CInt((newCount - 1) / _pagesize)
            If (_dg.CurrentPageIndex > PageCount - 1) Then
                _dg.CurrentPageIndex = PageCount - 1
            End If
        Else

            PageCount = 0
            _dg.CurrentPageIndex = 0

        End If

        Select Case (_dispStyle)

            Case 1
                LabelMsg.Text = "共" + PageCount.ToString() + "頁 第" + (_dg.CurrentPageIndex + 1).ToString() + "頁"
                LabelMsg.Text += " 總記?數：" + newCount.ToString() + ""

            Case 2
                LabelMsg.Text = (_dg.CurrentPageIndex + 1).ToString() + "/" + PageCount.ToString() + "頁"
                LabelMsg.Text += " 總數：" + newCount.ToString()

        End Select

        If (_autohidden) Then

            divPanel.Visible = ((newCount - 1) / _pagesize > 0)

        Else

            divPanel.Visible = True

        End If

        SetButtonState(PageCount)
    End Sub
    Public Sub SetButtonState(ByVal _PageCount As Integer)

        btnNavFirst.Enabled = (_dg.CurrentPageIndex > 0)
        btnNavPrevious.Enabled = (_dg.CurrentPageIndex > 0)
        btnNavNext.Enabled = (_dg.CurrentPageIndex < _PageCount - 1)
        btnNavLast.Enabled = (_dg.CurrentPageIndex < _PageCount - 1)
    End Sub

End Class