private static DownloadedEventArgs Download(string fileUrl)
        {
            DownloadedEventArgs args = new DownloadedEventArgs();

            try
            {
                HttpWebRequest reqUrl = (HttpWebRequest)WebRequest.Create(fileUrl);
                using (HttpWebResponse respUrl = (HttpWebResponse)(WebResponse)reqUrl.GetResponse())
                {
                    using (BinaryReader br = new BinaryReader(respUrl.GetResponseStream()))
                    {
                        long         fileLenth   = respUrl.ContentLength;
                        byte[]       fileContent = br.ReadBytes((Int32)fileLenth);
                        string       filePath    = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().GetName().CodeBase), Path.GetFileName(fileUrl));
                        BinaryWriter bw          = new BinaryWriter(new FileStream(filePath, FileMode.Create));
                        bw.Write(fileContent, 0, (Int32)fileLenth);
                        bw.Close();

                        args.Code     = "OK";
                        args.Desc     = "下载成功";
                        args.FilePath = filePath;
                    }
                }
            }
            catch (Exception ex)
            {
                args.Exception = ex;
            }
            return(args);
        }
        private static void DoWork()
        {
            CheckedEventArgs argsCheck = Check(Constants.CurVersion, Constants.UpdaterUrl);

            if (argsCheck.Exception != null)
            {
                if (null != OnEnd)
                {
                    OnEnd(argsCheck.Exception, false);
                }
                return;
            }
            if (argsCheck.Code == "Unavailable")
            {
                if (null != OnProgress)
                {
                    OnProgress(new ProgressEventArgs {
                        Code = "Finished", Desc = argsCheck.Desc, Percent = 100
                    });
                }
                return;
            }
            if (null != OnProgress)
            {
                OnProgress(new ProgressEventArgs {
                    Code = "Progressing", Desc = argsCheck.Desc, Percent = 33
                });
            }
            DownloadedEventArgs argsDownload = Download(argsCheck.FileUrl);

            if (argsDownload.Exception != null)
            {
                if (null != OnEnd)
                {
                    OnEnd(argsDownload.Exception, false);
                }
                return;
            }
            if (null != OnProgress)
            {
                OnProgress(new ProgressEventArgs {
                    Code = "Progressing", Desc = argsDownload.Desc, Percent = 66
                });
            }
            ResultEventArgs argsResult = null;

            if (argsDownload.FilePath.EndsWith(".zip"))
            {
                argsResult = UnZip(argsDownload.FilePath);
            }
            else if (argsDownload.FilePath.EndsWith(".cab"))
            {
                argsResult = ExecuteCab(argsDownload.FilePath);
            }
            if (null == argsResult)
            {
                if (null != OnProgress)
                {
                    OnProgress(new ProgressEventArgs {
                        Code = "Finished", Desc = "升级成功", Percent = 100
                    });
                }
                return;
            }
            if (argsResult.Exception != null)
            {
                if (null != OnEnd)
                {
                    OnEnd(argsResult.Exception, false);
                }
                return;
            }
            if (null != OnProgress)
            {
                OnProgress(new ProgressEventArgs {
                    Code = "Finished", Desc = argsResult.Desc, Percent = 100, NoRun = argsResult.NoRun
                });
            }
        }