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namespace wmj
{
public class myupload
{
private system.web.httppostedfile postedfile=null;
private string savepath="";
private string extension="";
private int filelength=0;
//显示该组件使用的参数信息
public string help
{
get{
string helpstring;
helpstring="<font size=3>myupload myupload=new myupload(); //构造函数";
helpstring+="myupload.postedfile=file1.postedfile;//设置要上传的文件";
helpstring+="myupload.savepath=\"e:\\\";//设置要上传到服务器的路径，默认c:\\";
helpstring+="myupload.filelength=100; //设置上传文件的最大长度，单位k，默认1k";
helpstring+="myupload.extension=\"doc\";设置上传文件的扩展名，默认txt";
helpstring+="label1.text=myupload.upload();//开始上传，并显示上传结果</font>";
helpstring+="<font size=3 color=red>design by wengmingjun 2001-12-12 all right reserved!</font>";
return helpstring;
}
}
public system.web.httppostedfile postedfile
{
get
{
return postedfile;
}
set
{
postedfile=value;
}
}
public string savepath
{
get
{
if(savepath!="") return savepath;
return "c:\\";
}
set
{
savepath=value;
}
}
public int filelength
{
get
{
if(filelength!=0) return filelength;
return 1024;
}
set
{
filelength=value*1024;
}
}
public string extension
{
get
{
if(extension!="") return extension;
return "txt";
}
set
{
extension=value;
}
}
public string pathtoname(string path)
{
int pos=path.lastindexof("\\");
return path.substring(pos+1);
}
public string upload()
{
if(postedfile!=null)
{
try{
string filename=pathtoname(postedfile.filename);
if(!filename.endswith(extension)) return "you must select "+extension+" file!";
if(postedfile.contentlength>filelength) return "file too big!";
postedfile.saveas(savepath+filename);
return "upload file successfully!";
}
catch(system.exception exc)
{return exc.message;}
}
return "please select a file to upload!";
}
}
}
用csc /target:library wmj.cs 编译成dll供以后多次调用
调用举例
<%@page language="c#" runat="server"%>
<%@import namespace="wmj"%>
<script language="c#" runat="server">
void upload(object sender,eventargs e)
{
myupload myupload=new myupload();
// label1.text=myupload.help;
myupload.postedfile=file1.postedfile;
myupload.savepath="e:\\";
myupload.filelength=100;
label1.text=myupload.upload();
}
</script>
<form enctype="multipart/form-data" runat="server">
<input type="file" id="file1" runat="server"/>
<asp:button id="button1" text="upload" onclick="upload" runat="server"/>
<asp:label id="label1" runat="server"/>
</form>
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