public void uploadfile(object sender , eventargs e)
{
//检查上传文件不为空
if(myfile.postedfile!=null)
{
string nam = myfile.postedfile.filename ;
//取得文件名(抱括路径)里最后一个"."的索引
int i= nam.lastindexof(".");
//取得文件扩展名
string newext =nam.substring(i);
//这里我自动根据日期和文件大小不同为文件命名,确保文件名不重复
datetime now = datetime.now;
string newname=now.dayofyear.tostring()+myfile.postedfile.contentlength.tostring();
//保存文件到你所要的目录,这里是iis根目录下的uploadfiles目录
//注意: 我这里用server.mappath()取当前文件的绝对目录.在asp.net里"\"必须用"\\"代替
myfile.postedfile.saveas(server.mappath(".\\uploadfiles\\"+newname+newext));
//得到这个文件的相关属性:文件名,文件类型,文件大小
fname.text=myfile.postedfile.filename;
fenc.text=myfile.postedfile.contenttype ;
fsize.text=myfile.postedfile.contentlength.tostring();
image1.imageurl = "http://localhost/web/news/uploadfiles/"+newname+newext;
}
}
html页面代码
<%@ page language="c#" codebehind="webform2.aspx.cs" autoeventwireup="false" inherits="web.news.webform2" %>
<!doctype html public "-//w3c//dtd html 4.0 transitional//en" >
<html>
<head>
<title>webform2</title>
<meta content="microsoft visual studio .net 7.1" name="generator">
<meta content="c#" name="code_language">
<meta content="javascript" name="vs_defaultclientscript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetschema">
<script language="c#" runat="server">
//this method is called when the "upload" button id pressed
</script>
</head>
<body ms_positioning="gridlayout">
<form id="form1" method="post" runat="server">
<input id="myfile" style="z-index: 101; left: 408px; position: absolute; top: 224px" type="file"
name="myfile" runat="server">
<asp:button id="button1" style="z-index: 102; left: 496px; position: absolute; top: 304px" onclick="uploadfile"
runat="server" text="上传"></asp:button>
<table cellspacing="2" border="1">
<tr>
<td><b>文件资料</b></td>
<td> </td>
</tr>
<tr>
<td>文件名 :</td>
<td><asp:label id="fname" runat="server" text=""></asp:label></td>
</tr>
<tr>
<td>文件类型 :</td>
<td><asp:label id="fenc" runat="server"></asp:label></td>
</tr>
<tr>
<td>文件大小 :(in bytes)</td>
<td><asp:label id="fsize" runat="server" /></td>
</tr>
</table>
<asp:image id="image1" style="z-index: 103; left: 112px; position: absolute; top: 160px" runat="server"
width="200px" height="224px"></asp:image>
</form>
</body>
</html>
