一個文件上傳的類

2024-07-21 02:16:33

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來源：轉載

供稿：網友

namespace wmj
{
public class myupload
{
private system.web.httppostedfile postedfile=null;
private string savepath="";
private string extension="";
private int filelength=0;
//顯示該組件使用的參數信息
public string help
{
get{
string helpstring;
helpstring="<font size=3>myupload myupload=new myupload(); //構造函數";
helpstring+="myupload.postedfile=file1.postedfile;//設置要上傳的文件";
helpstring+="myupload.savepath=/"e:///";//設置要上傳到服務器的路徑，默認c://";
helpstring+="myupload.filelength=100; //設置上傳文件的最大長度，單位k，默認1k";
helpstring+="myupload.extension=/"doc/";設置上傳文件的擴展名，默認txt";
helpstring+="label1.text=myupload.upload();//開始上傳，并顯示上傳結果</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 編譯成dll供以后多次調用
調用舉例
<%@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>
結論：asp.net的組件支持功能很強我們如果充分利用可以很容易的編寫出非常方便的組件可以大大的方便我們的工作

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