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。");
        }
    }