实现DataList控件的分页

新客网 XKER.COM 2005-06-11 来源：收藏本文

DataList控件功能很强大，他支持选择、编辑，实现的方法也很简单，不过最令人头疼的就是它不像DataGrid控件一样内置了分页的功能，这么好的一个控件竟然不能分页！！！确实是一个很让人头疼的事情。
　　不过，只是DataList没有提供内置的分页功能，但是并不表示，我们不能使用DataList控件来实现分页，既然它不给我分页功能，那只好自己动手了。
　　下面是全部原代码，其实用到的方法和PHP中的分页差不多，只是这里用的是DataAdapter与DataSet组合，而不是PHP中的SQL语句直接搞定。

default.aspx文件：
<%@ Page language="c#" Codebehind="default.aspx.cs" AutoEventWireup="false" Inherits="guestbook._default" %>
<HTML>
<HEAD>
<title>中国BS网留言簿</title>
<HTML>
<HEAD>
<title>DataList分页</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form method="post" action="default.aspx" runat="server" ID="Form1">
<table width="100%" border="0" cellpadding="2" cellspacing="0" align="center">
<tr>
<td align="middle">
<asp:DataList ID="Myguest" RepeatColumns="1" Runat="server">
<ItemTemplate>
<table class="gueststyleline" border="0" cellpadding="0" cellspacing="1" align="center" width="610">
<tr>
<td>
<table class="gueststyleline" border="0" cellpadding="0" cellspacing="1" align="center" width="610">
<tr>
<td>
<table width="100%" border="0" cellpadding="6" cellspacing="0" class="gueststylebg" align="center">
<tr>
<td width="112" align="center" height="153" valign="top">
<table width="100%" border="0" cellspacing="0" cellpadding="0" height="100%" class="gueststylebg">
<tr>
<td>
<table border="0" cellspacing="0" cellpadding="0" align="center" height="25">
<tr>
<td class="FILTER">
<div align="center"><font style="LEFT: 0px; WIDTH: 100%; WORD-WRAP: break-word; 130; 0pt"><%# DataBinder.Eval(Container.DataItem,"name") %></font></div>
</td>
</tr>
</table>
<div align="center"><font style="LEFT: 0px; WIDTH: 100%; WORD-WRAP: break-word; 130; 0pt"><img src="<%# DataBinder.Eval(Container.DataItem,"face") %>" width="80" height="90" align="middle"></font><br>
<br>
★
<%# DataBinder.Eval(Container.DataItem,"sex") %>
★</div>
</td>
</tr>
</table>
</td>
<td align="center" height="153" width="2">
<table class="gueststyleline" width="1" height="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="1"></td>
</tr>
</table>
</td>
<td height="33" valign="top" width="463">
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="gueststylebg" style="TABLE-LAYOUT: fixed" height="20">
<tr>
<td height="14" width="310"><img src="images/icon/subject.gif" width="15" height="15" alt="主题">:<%# DataBinder.Eval(Container.DataItem,"caption") %><br>
</td>
<td width="151" height="14"><font style="0pt">  <img src="images/icon/posttime.gif" width="16" height="15" alt="发表时间[北京时间]">:<%# DataBinder.Eval(Container.DataItem,"postdate") %></font></td>
</tr>
</table>
<hr class="gueststylehr" size="0.1" width="100%">
<table width="100%" border="0" cellpadding="5" cellspacing="0" class="gueststylebg" height="45%" style="TABLE-LAYOUT: fixed">
<tr>
<td valign="top" width="28" align="center"><img src="images/emot/1.gif" width="16" height="16">
</td>
<td valign="top" width="94%" style="LEFT: 0px; WIDTH: 100%; WORD-WRAP: break-word; 130; 0pt">
<%# DataBinder.Eval(Container.DataItem,"content") %>
</td>
</tr>
</table>
<table width="100%" border="0" cellpadding="4" cellspacing="0">
<tr>
<td valign="top">
<hr class="gueststylehr" size="0.1" width="100%">
<a href="<%# DataBinder.Eval(Container.DataItem,"homepage") %>" target="_blank"><img src="images/icon/home.gif" width="44" height="16"  border="0"></a> 
<a href="http://www.chinagz.net/ip/ipsearch.cgi?ip=<%# DataBinder.Eval(Container.DataItem,"ip") %>" target="_blank"><img src="images/icon/ip.gif" align="absmiddle" height="16" border="0"></a> 
<a href="http://search.tencent.com/cgi-bin/friend/user_show_info?ln=<%# DataBinder.Eval(Container.DataItem,"qq") %>" target="_blank">
<img src="images/icon/qq.gif" border="0" width="35" height="16"></a> 
<a href="mailto:<%# DataBinder.Eval(Container.DataItem,"email") %>"><img src="images/icon/email.gif" width="42" height="16" border="0" alt=""></a> 
<a href="javascript:;" onClick="MM_showHideLayers("admin","","hide","postcontent","","show")">
<img src="images/icon/postguest.gif" width="45" height="16" border="0"></a>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</ItemTemplate>
</asp:DataList>
<BR>
</td>
</tr>
</table>
<table width="100%" border="0" cellspacing="0" cellpadding="2" align="center" height="9">
<TBODY>
<tr>
<td align="middle">
<table class="gueststyleline" width="610" border="0" cellpadding="1" cellspacing="0" height="18">
<tr>
<td height="24">
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="gueststylebg" height="18">
<tr>
<td width="35%" align="middle" height="36">
共有<asp:Label id="lblRecordCount" ForeColor="red" runat="server" />条记录  当前为<asp:Label id="lblCurrentPage" ForeColor="red" runat="server" />/<asp:Label id="lblPageCount" ForeColor="red" runat="server" />页
</td>
<td align="middle" height="36">
<asp:LinkButton id="lbnPrevPage" Text="上一页" CommandName="prev" runat="server" />
<asp:LinkButton id="lbnNextPage" Text="下一页" CommandName="next" runat="server" />
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</TBODY>
</table>
</form>
</body>
</HTML>

注意：必须把两个LinkButton控件的Command事件改为Page_OnClick：

codebehind文件：
private void Page_Load(object sender, System.EventArgs e)
{
PageSize=1;
Conn= new SqlConnection(Application["Guest_Conn"].ToString());
Conn.Open();
if(!Page.IsPostBack)
{
  ListBind();
  CurrentPage = 0;
  ViewState["PageIndex"] = 0;
  //计算总共有多少记录
  RecordCount = CalculateRecord();
  lblRecordCount.Text = RecordCount.ToString();
  //计算总共有多少页
  PageCount = RecordCount/PageSize;
  lblPageCount.Text = PageCount.ToString();
  ViewState["PageCount"] = PageCount;
}
}

//计算总共有多少条记录
public int CalculateRecord()
{
int intCount;
string strCount = "select count(*) as co from guest";
SqlCommand MyComm = new SqlCommand (strCount,Conn);
SqlDataReader dr = MyComm.ExecuteReader();
if(dr.Read())
{
   intCount = Int32.Parse(dr["co"].ToString());
}
else
{
   intCount = 0;
}
dr.Close();
return intCount;
}

ICollection CreateSource()
{
int StartIndex;
//设定导入的起终地址
StartIndex = CurrentPage*PageSize;
string strSel = "Select * from guest order by postdate desc";
DataSet ds = new DataSet();
SqlDataAdapter MyAdapter = new SqlDataAdapter(strSel,Conn);
MyAdapter.Fill(ds,StartIndex,PageSize,"guest");
return ds.Tables["guest"].DefaultView;
}

public void ListBind()
{
Myguest.DataSource = CreateSource();
Myguest.DataBind();
lbnNextPage.Enabled = true;
lbnPrevPage.Enabled = true;
if(CurrentPage==(PageCount-1)) lbnNextPage.Enabled = false;
if(CurrentPage==0) lbnPrevPage.Enabled = false;
lblCurrentPage.Text = (CurrentPage+1).ToString();
}

public void Page_OnClick(Object sender,CommandEventArgs e)
{
CurrentPage = (int)ViewState["PageIndex"];
PageCount = (int)ViewState["PageCount"];
string cmd = e.CommandName;
//判断cmd，以判定翻页方向
switch(cmd)
{
  case "next":
   if(CurrentPage<(PageCount-1)) CurrentPage++;
   break;
  case "prev":
   if(CurrentPage>0) CurrentPage--;
   break;
}
ViewState["PageIndex"] = CurrentPage;
ListBind();
}

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