十天学会ASP.Net9,10
十天学会ASP.Net之第九天
学习目的：学会用DATAGRID分页显示
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_PageInd Exchanged(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>
<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_PageInd Exchanged(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>
--------------------------------------------------------------------------------
<script runat="server" language="vb">
subPage_Load
dim objConnection as OleDbConnection
dim objDataAdapter as OleDbDataAdapter
dim objDataSet as DataSet
objConnection=new OleDbConnection("Provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("guestbook.mdb"))
objDataAdapter=new OleDbDataAdapter("select * from guestbook",objConnection)
objDataSet=new DataSet
objDataAdapter.Fill(objDataSet)
dgrdMain.DataSource=objDataSet
dgrdMain.DataBind()
end sub
sub dgrdMain_PageIndexChanged(sender as object,e as datagridpagechangedeventargs)
dgrdMain.CurrentPageIndex = e.NewPageIndex
DataBind
end 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>
subPage_Load
dim objConnection as OleDbConnection
dim objDataAdapter as OleDbDataAdapter
dim objDataSet as DataSet
objConnection=new OleDbConnection("Provider=Microsoft.Jet.OleDb.4.0;Data Source="+Server.MapPath("guestbook.mdb"))
objDataAdapter=new OleDbDataAdapter("select * from guestbook",objConnection)
objDataSet=new DataSet
objDataAdapter.Fill(objDataSet)
dgrdMain.DataSource=objDataSet
dgrdMain.DataBind()
end sub
sub dgrdMain_PageIndexChanged(sender as object,e as datagridpagechangedeventargs)
dgrdMain.CurrentPageIndex = e.NewPageIndex
DataBind
end 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。
十天学会ASP.Net之第十天
学习目的：学会SESSION和COOKIE的使用
学习目的：学会SESSION和COOKIE的使用
在各个网页间的变量传递和一些记录用户的登陆信息要用到SESSION和COOKIE。在ASP.NET中使用COOKIE比ASP中稍微麻烦一点，因为我们要申明变量。
首先看一下SESSION的使用，基本和ASP差不多
写入一个SESSION：
写入一个SESSION：
Session["username"])="aa";
--------------------------------------------------------------------------------
Session("username")="aa"
读取一个SESSINN：
string username= Session["username"];
--------------------------------------------------------------------------------
dim username=Session("username")
再来看一下COOKIE的写入：
DateTime dt=DateTime.Now; //需要< %@Import Namespace="System"%>，得到当前时间
HttpCookie mycookie=new HttpCookie("logname");//申明新的COOKIE变量
mycookie.Value="aa";//赋值
mycookie.Expires=Convert.ToDateTime(dt+TimeSpan.FromDays(1));//设定过期时间为1天
Response.Cookies.Add(mycookie1);//写入COOKIE
DateTime dt=DateTime.Now; //需要< %@Import Namespace="System"%>，得到当前时间
HttpCookie mycookie=new HttpCookie("logname");//申明新的COOKIE变量
mycookie.Value="aa";//赋值
mycookie.Expires=Convert.ToDateTime(dt+TimeSpan.FromDays(1));//设定过期时间为1天
Response.Cookies.Add(mycookie1);//写入COOKIE
--------------------------------------------------------------------------------
dim dt as DateTime
dt=DataTime.Now
dim mycookie as HttpCookie
mycookie=new HttpCookie("logname")
mycookie.Value="aa"
mycookie.Expires=Convert.ToDateTime(dt+TimeSpan.FromDays(1))
Response.Cookies.Add(mycookie1)
dt=DataTime.Now
dim mycookie as HttpCookie
mycookie=new HttpCookie("logname")
mycookie.Value="aa"
mycookie.Expires=Convert.ToDateTime(dt+TimeSpan.FromDays(1))
Response.Cookies.Add(mycookie1)
看一下COOKIE的读取：
HttpCookie mycookie=Request.Cookies["username"];
string username=mycookie.Value;
string username=mycookie.Value;
--------------------------------------------------------------------------------
dim mycookie as HttpCookie
mycookie=Request.Cookies["username"]
dim string=mycookie.Value
mycookie=Request.Cookies["username"]
dim string=mycookie.Value
到此《十天学会ASP.NET》结束了，时间仓促，还请大家原谅写的不全，实际上我只是带大家入门，学会还要靠自己啊。