学习目的：学会用DATAGRID分页显示
虽然说DATAGRID的分页显示效率不怎么高，但是不管怎么说，它是最方便的分页显示，对于做一个留言簿还是相当简单实用的。对于启用分页功能还有一个重要要求，只能在DATADRID控件的数据源实现了ICOLLECTION接口的情况下才能启用分页功能，而DATAREADER没有这个接口，所以必须使用DATATABLE来代替。<script runat="server" language="c#">void Page_Load(){ string strConnection="Provider=Microsoft.Jet.OleDb.4.0;Data Source=";strConnection+=Server.MapPath("guestbook.mdb");OleDbConnection objConnection=new OleDbConnection(strConnection);OleDbDataAdapter objDataAdapter=new OleDbDataAdapter("select * from guestbook",objConnection);DataSet objDataSet=new DataSet();objDataAdapter.Fill(objDataSet);dgrdMain.DataSource=objDataSet;dgrdMain.DataBind();}void dgrdMain_PageIndexChanged(Object sender, DataGridPageChangedEventArgs e){dgrdMain.CurrentPageIndex = e.NewPageIndex; DataBind(); } </script><html><body> <asp:DataGrid id="dgrdMain" cellpadding="1" showheader="true" borderwidth="0"allowpaging="true" 启用分页功能pagesize="3" 每一页显示三条记录onpageindexchanged="dgrdMain_pageindexchanged " 调用第×页的函数为dgrdMain_PageIndexChanged()runat="server" /> </body></html>
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<script runat="server" language="vb">subPage_Loaddim objConnection as OleDbConnectiondim objDataAdapter as OleDbDataAdapterdim objDataSet as DataSetobjConnection=new OleDbConnection("Provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("guestbook.mdb"))objDataAdapter=new OleDbDataAdapter("select * from guestbook",objConnection)objDataSet=new DataSetobjDataAdapter.Fill(objDataSet)dgrdMain.DataSource=objDataSetdgrdMain.DataBind()end subsub dgrdMain_PageIndexChanged(sender as object,e as datagridpagechangedeventargs)dgrdMain.CurrentPageIndex = e.NewPageIndexDataBindend sub</script> <html><body> <asp:DataGrid id="dgrdMain" cellpadding="1" showheader="true" borderwidth="0"allowpaging="true" 启用分页功能pagesize="3" 每一页显示三条记录onpageindexchanged="dgrdMain_pageindexchanged " 调用第×页的函数为dgrdMain_PageIndexChanged()runat="server" /> </body></html>
这样就是最简单的分页，我们可以用参数pagestyle-mode="nextprev/numericpages"来设定是显示上一页、下一页方式还是直接选择页面的数字方式来实现页面跳转。如果是前者我们可以用pagestyle-nextpagetext来设定包含下一页链接的文本，用pagestyle-prevpagetext来设定包含上一页链接的文本；如果是后者我们可以用PagerStyle-PageButtonCount来设定在使用省略号之前显示的页面编号数量（默认是10）
今天就说到这里，明天说一下SESSION和COOKIE。
