Eric的超高效数据分页(图示+代码) ^_^

运行截图:

数据表结构:

megaid int IDENTITY (1, 1) NOT NULL PRIMARY KEY CLUSTERED

megaguid char (36) NOT NULL INDEX

数据生成脚本:

DECLARE @i int

SET @i = 1

WHILE @i < 1000001

BEGIN

INSERT INTO megatable (megaguid) VALUES(NEWID())

SET @i = @i + 1

END

C#代码:

DateTime startTime;

void Page_Init(Object sender, EventArgs e)

{

startTime = DateTime.Now;

}

protected override void Render(HtmlTextWriter writer)

{

base.Render(writer);

Response.Write("本页执行时间: " + (DateTime.Now - startTime));

}

int records = 10000;

int pages = 10;

int pageSize = 15;

SqlConnection conn = new SqlConnection("Server=(local);Database=megadata;User Id=sa;Password=xxx");

void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

dgBind(getSqlString(1));

}

int firstPage = int.Parse(hidFirstPage.Value);

pnlButtons.Controls.Add(getPager(firstPage));

lblPrompt.Text = "数据提取范围: <B>SELECT TOP " + records.ToString() + " megaid FROM megatable ORDER BY megaguid</B>";

}

string getSqlString(int selectedPage)

{

string[] idsStrArray;

string sqlStr;

if (Session["idStr"] != null)

{

idsStrArray = Session["idStr"].ToString().Split('#');

}

else

{

sqlStr = "SELECT TOP " + records.ToString() + " megaid FROM megatable ORDER BY megaguid";

SqlCommand cmd = new SqlCommand(sqlStr, conn);

conn.Open();

SqlDataReader dr = cmd.ExecuteReader();

StringBuilder sb = new StringBuilder("");

int n = 1;

while (dr.Read())

{

if (n % pageSize == 0)

{

sb.Append(dr[0].ToString() + "#");

}

else

{

sb.Append(dr[0].ToString() + ",");

}

n++;

}

dr.Close();

conn.Close();

sb.Remove(sb.Length - 1, 1);

idsStrArray = sb.ToString().Split('#');

Session["idStr"] = sb.ToString();

}

hidPageCount.Value = idsStrArray.Length.ToString();

sqlStr = "SELECT megaid, megaguid FROM megatable WHERE megaid IN (" + idsStrArray[selectedPage - 1] + ") ";

sqlStr += "ORDER BY megaguid";

return sqlStr;

}

Panel getPager(int firstPage)

{

int pageCount = int.Parse(hidPageCount.Value);

Panel pnlPager = new Panel();

pnlPager.Controls.Add(new LiteralControl("<BR> 共" + pageCount.ToString() + "页 "));

pnlPager.Controls.Add(getLinkButton("Fst", "首页", "pgBtn", "1"));

pnlPager.Controls.Add(new LiteralControl(" "));

if (firstPage > 0)

{

pnlPager.Controls.Add(getLinkButton("Pre", "前" + pages.ToString() + "页", "pgBtn", (firstPage - pages + 1).ToString()));

pnlPager.Controls.Add(new LiteralControl(" "));

}

for (int i = firstPage + 1; i < firstPage + pages + 1; i++)

{

if (i > pageCount)

{

break;

}

pnlPager.Controls.Add(getLinkButton(i.ToString(), "[" + i.ToString() + "]", "pgBtn", i.ToString()));

pnlPager.Controls.Add(new LiteralControl(" "));

}

if (firstPage + pages < pageCount)

{

pnlPager.Controls.Add(getLinkButton("Nxt", "后" + pages.ToString() + "页", "pgBtn", (firstPage + pages + 1).ToString()));

pnlPager.Controls.Add(new LiteralControl(" "));

}

pnlPager.Controls.Add(getLinkButton("Lst", "末页", "pgBtn", pageCount.ToString()));

return pnlPager;

}

LinkButton getLinkButton(string lbId, string lbText, string lbCmdName, string lbCmdArg)

{

LinkButton lb = new LinkButton();

lb.ID = lbCmdName + lbId;

lb.Text = lbText;

lb.CommandName = lbCmdName;

lb.CommandArgument = lbCmdArg;

lb.Command += new CommandEventHandler(pageTurn);

return lb;

}

void pageTurn(object sender, CommandEventArgs e)

{

LinkButton lb = (LinkButton)sender;

int selectedPage = int.Parse(lb.CommandArgument);

int firstPage = selectedPage / pages * pages;

firstPage = (selectedPage % pages == 0) ? (firstPage - pages) : firstPage;

hidFirstPage.Value = firstPage.ToString();

dgBind(getSqlString(selectedPage));

pnlButtons.Controls.RemoveAt(pnlButtons.Controls.Count - 1);

pnlButtons.Controls.Add(getPager(firstPage));

lb = (LinkButton)pnlButtons.Controls[pnlButtons.Controls.Count - 1].FindControl("pgBtn" + selectedPage.ToString());

lb.Enabled = false;

}

void dgBind(string sqlStr)

{

SqlDataAdapter da = new SqlDataAdapter(sqlStr, conn);

DataTable dt = new DataTable();

conn.Open();

da.Fill(dt);

conn.Close();

da.Dispose();

dg.DataSource = dt;

dg.DataBind();

}

void dg_ItemDataBound(object sender, DataGridItemEventArgs e)

{

dg.Controls[0].EnableViewState = false;

}

ASPX代码:

@ Import Namespace="System.Text" %>

@ Import Namespace="System.Data.SqlClient" %>

@ Import Namespace="System.Data" %>

@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<HTML>

<HEAD>

<TITLE>Pager</TITLE>

//插入上面的C#代码

</SCRIPT>

<STYLE>

BODY {

}{ FONT-SIZE: 9pt; FONT-FAMILY: Tahoma,宋体; TEXT-ALIGN: center }

TD {

}{ FONT-SIZE: 9pt; FONT-FAMILY: Tahoma,宋体; TEXT-ALIGN: center }

</STYLE>

</HEAD>

<BODY>

<DIV>

<ASP:LABEL id="lblPrompt" runat="server" text="?" enableviewstate="False" enabletheming="True"></ASP:LABEL>

BR>

<ASP:PANEL id="pnlButtons" runat="server" width="560px">

<ASP:DATAGRID id="dg" runat="server" width="100%" onitemdatabound="dg_ItemDataBound" cellpadding="4"

backcolor="White" borderwidth="1px" borderstyle="None" bordercolor="#CC9966" autogeneratecolumns="False"

pagesize="5">

<ASP:BOUNDCOLUMN datafield="megaid" headertext="MegaID"></ASP:BOUNDCOLUMN>

<ASP:BOUNDCOLUMN datafield="megaguid" headertext="MegaGUID"></ASP:BOUNDCOLUMN>

</COLUMNS>

</ASP:DATAGRID>

</ASP:PANEL></DIV>

BR>

<ASP:HYPERLINK id="lnkReload" runat="server" width="80px" navigateurl="Pager.aspx" enableviewstate="False">重载</ASP:HYPERLINK>

</FORM>

</BODY>

</HTML>