ASP.net中的Datagrid自定义分页功能
看到在CSDN中已经有了不少自定义分页的例子，参考了很多，但是老觉得别人写的功能不是很完备，自己也摸索的写了一个，主要参考了“孟子E章”的分页例子。
这里使用的是VB.net语言。
DataGridPaging.aspx
参考下面我的回复中，这里帖不上代码。
DataGridPaging.aspx.vb
Imports System.Data.SqlClient
Imports System.Data
Imports System.Web.UI
Public Class DataGridPaging
Inherits System.Web.UI.Page
Protected WithEvents btnFirst As System.Web.UI.WebControls.LinkButton
Protected WithEvents btnPrev As System.Web.UI.WebControls.LinkButton
Protected WithEvents btnNext As System.Web.UI.WebControls.LinkButton
Protected WithEvents btnLast As System.Web.UI.WebControls.LinkButton
Protected WithEvents lblCurrentIndex As System.Web.UI.WebControls.Label
Protected WithEvents lblPageCount As System.Web.UI.WebControls.Label
Protected WithEvents lblRegisterCount As System.Web.UI.WebControls.Label
Protected WithEvents DataGrid As System.Web.UI.WebControls.DataGrid
Protected WithEvents DataGrid1 As System.Web.UI.WebControls.DataGrid
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Dim cnn As New SqlConnection("Password=; User ID=sa;Initial Catalog=northwind;Data Source=localhost;Connect Timeout=30")
Dim adp As New SqlDataAdapter
Dim cmd As New SqlCommand
Dim ds As New DataSet
' Dim intStartIndex As Long
'定义全局静态变量，记录选中页面之前的总记录数
Private Shared preceding As Long
Private Shared gridPageSize As Int16
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
btnFirst.Text = "最首页"
btnPrev.Text = "前一页"
btnNext.Text = "下一页"
btnLast.Text = "最后页"
If Not IsPostBack Then
Try
Dim cmd As New SqlCommand("select count(*) from products", cnn)
cnn.Open()
'设置在使用自定义分页时 DataGrid 控件中的实际项数。
'Dim i As Int16
'i = cmd.ExecuteScalar()
'MyDataGrid.VirtualItemCount=(i / MyDataGrid.PageSize)
DataGrid1.VirtualItemCount = cmd.ExecuteScalar()
Catch ex As Exception
Response.Write("<script language=javascript>alert('错误原因：' + exp.tostring() )</script>")
Finally
cnn.Close()
End Try
preceding = DataGrid1.PageSize
BindGrid()
End If
End Sub
Sub BindGrid()
'使用DataSet方法填充DataGrid
Dim str As String = " * "
'Dim gridPageSize As Int16 = DataGrid1.PageSize
gridPageSize = DataGrid1.PageSize
Dim cmdNumber As New SqlCommand("select count(*) from products ", cnn)
Try
cnn.Open()
'设置在使用自定义分页时 DataGrid 控件中.VirtualItemCount存放总的实际项数。
DataGrid1.VirtualItemCount = cmdNumber.ExecuteScalar()
'使用求余保证最后一页的合理显示
If preceding >= DataGrid1.VirtualItemCount Then
gridPageSize = DataGrid1.VirtualItemCount Mod DataGrid1.PageSize
If gridPageSize = 0 Then
gridPageSize = DataGrid1.PageSize
End If
End If
str = "select " + str + " from( select top " & gridPageSize.ToString + str + " from( select top " + CStr(preceding) + str + " from products where productID >0 order by productID ) as p order by productID desc )as p order by productID "
Cmd.CommandText = str
Cmd.Connection = cnn
adp.SelectCommand = Cmd
'adp = New SqlDataAdapter(str, cnn)
adp.Fill(ds, "products")
DataGrid1.DataSource = ds.Tables("products").DefaultView
DataGrid1.DataBind()
Catch ex As Exception
Response.Write("错误原因：" + ex.ToString())
'Throw ex
Finally
If cnn.State = ConnectionState.Open Then
cnn.Close()
End If
End Try
ShowStats()
HideButton()
End Sub
' ------------------------------------------- 下面是分页功能 -----------------------------------------------
Sub DataGrid1_Page(ByVal sender As Object, ByVal e As DataGridPageChangedEventArgs)
'点击GRID某一页时发生
'GridXQ.aspx中DataGrid 的 OnPageIndexChanged="DataGrid1_Page"
preceding = (e.NewPageIndex + 1) * DataGrid1.PageSize
DataGrid1.CurrentPageIndex = e.NewPageIndex
BindGrid()
ShowStats()
HideButton()
End Sub
Sub PagerButtonClick(ByVal sender As Object, ByVal e As EventArgs)
'used by external paging UI
'页面上Grid下方 linkbutton 的 onclick="PagerButtonClick" CommandArgument="next/prev/last/……"
Dim arg As String = sender.CommandArgument
Select Case arg
Case "next"
If (DataGrid1.CurrentPageIndex <= (DataGrid1.PageCount - 1)) Then
DataGrid1.CurrentPageIndex += 1
If DataGrid1.CurrentPageIndex = DataGrid1.PageCount - 1 Then
preceding = DataGrid1.VirtualItemCount
Else
preceding += gridPageSize
End If
End If
Case "prev"
If (DataGrid1.CurrentPageIndex > 0) Then
If DataGrid1.CurrentPageIndex = DataGrid1.PageCount - 1 Then
preceding = (DataGrid1.PageCount - 1) * DataGrid1.PageSize
Else
preceding -= gridPageSize
End If
DataGrid1.CurrentPageIndex -= 1
End If
Case "last"
DataGrid1.CurrentPageIndex = (DataGrid1.PageCount - 1)
preceding = DataGrid1.VirtualItemCount
Case Else
'page number 因为在button.commandArgument设置为0
DataGrid1.CurrentPageIndex = System.Convert.ToInt32(arg)
preceding = DataGrid1.PageSize
End Select
If (DataGrid1.CurrentPageIndex = (DataGrid1.PageCount - 1)) Then
btnNext.Enabled = False
Else
btnNext.Enabled = True
End If
If (DataGrid1.CurrentPageIndex = 0) Then
btnPrev.Enabled = False
Else
btnPrev.Enabled = True
End If
BindGrid()
ShowStats()
HideButton()
End Sub
Sub ShowStats()
lblCurrentIndex.Text = "第 " + (DataGrid1.CurrentPageIndex + 1).ToString() + " 页"
lblPageCount.Text = "总共 " + DataGrid1.PageCount.ToString() + " 页"
lblRegisterCount.Text = "共有 " + DataGrid1.VirtualItemCount.ToString + " 条记录"
End Sub
Sub HideButton()
If (DataGrid1.CurrentPageIndex = (DataGrid1.PageCount - 1)) Then
btnNext.Enabled = False
btnLast.Enabled = False
Else
btnNext.Enabled = True
btnLast.Enabled = True
End If
If (DataGrid1.CurrentPageIndex = 0) Then
btnPrev.Enabled = False
btnFirst.Enabled = False
Else
btnPrev.Enabled = True
btnFirst.Enabled = True
End If
End Sub
End Class