一个文件上传的类

www.hx99.org 阅读: 时间:2007-07-12 整理:华西黑盟
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  namespaceWmj
{
publicclassMyUpload
{
privateSystem.Web.HttpPostedFilepostedFile=null;
privatestringsavePath="";
privatestringextension="";
privateintfileLength=0;
//显示该组件使用的参数信息
publicstringHelp
{
get{
stringhelpstring;
helpstring="<fontsize=3>MyUploadmyUpload=newMyUpload(); //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+="<fontsize=3color=red>DesignByWengMingJun 2001-12-12AllRightReserved!</font>";
returnhelpstring;
}
}

 

publicSystem.Web.HttpPostedFilePostedFile
{
get
{
returnpostedFile;
}
set
{
postedFile=value;
}
}

 

publicstringSavePath
{
get
{
if(savePath!="")returnsavePath;
return"c:\\";
}
set
{
savePath=value;
}
}

 

publicintFileLength
{
get
{
if(fileLength!=0)returnfileLength;
return1024;
}
set
{
fileLength=value*1024;
}
}

 

publicstringExtension
{
get
{
if(extension!="")returnextension;
return"txt";
}
set
{
extension=value;
}
}

 

publicstringPathToName(stringpath)
{
intpos=path.LastIndexOf("\\");
returnpath.Substring(pos+1);
}

 

publicstringUpload()
{
if(PostedFile!=null)
{
try{
stringfileName=PathToName(PostedFile.FileName);
if(!fileName.EndsWith(Extension))return"Youmustselect"+Extension+"file!";
if(PostedFile.ContentLength>FileLength)return"Filetoobig!";
PostedFile.SaveAs(SavePath+fileName);
return"UploadFileSuccessfully!";
}
catch(System.Exceptionexc)
{returnexc.Message;}
}
return"Pleaseselectafiletoupload!";
}
}
}

 

用csc/target:LibraryWmj.cs编译成dll供以后多次调用
调用举例
<%@pagelanguage="C#"runat="server"%>
<%@importnamespace="Wmj"%>
<scriptlanguage="C#"runat="server">
voidUpload(objectsender,EventArgse)
{
MyUploadmyUpload=newMyUpload();
//label1.Text=myUpload.Help;
myUpload.PostedFile=file1.PostedFile;
myUpload.SavePath="e:\\";
myUpload.FileLength=100;
label1.Text=myUpload.Upload();
}
</script>
<formenctype="multipart/form-data"runat="server">
<inputtype="file"id="file1"runat="server"/>
<asp:Buttonid="button1"Text="Upload"OnClick="Upload"runat="server"/>
<asp:Labelid="label1"runat="server"/>
</form>
结论：asp.net的组件支持功能很强我们如果充分利用可以很容易的编写出非常方便的组件可以大大的方便我们的工作

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