asp.net简单的文件上传代码

const string _RegSubFix = @"/.[/w]+$";
const string _Regzip = @"/.zip|/.rar";
protected void btnUpload_Click(object sender, EventArgs e)
{
if (filUpload.HasFile)
{
string subfix = Regex.Match(filUpload.FileName, _RegSubFix).Value.ToLower();
if (filUpload.PostedFile.ContentType == "application/octet-stream" && !Regex.IsMatch(filUpload.FileName, _RegZip))
{
WebManageshell.WebHelp.Alert(this.Page, "不受支持的文件格式。");
return;
}
string folder = ConfigurationManager.AppSettings["UploadPath"] + "//" + DateTime.Now.ToString("yyyyMM");
try
{
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
string file = folder + "//" +  DateTime.Now.ToFileTimeUtc().ToString() + subfix;
filUpload.SaveAs(file);
WebManageShell.WebHelp.Alert(this.Page,"文件上传成功。");
}
catch
{
WebManageShell.WebHelp.Alert(this.Page, "文件上传失败。");
}
}
else
{
WebManageShell.WebHelp.Alert(this.Page, "你没有上传文件。");
}
}