求下载文件方法

Question

求下载文件方法

Answer 1

 public   static   bool   DownLoadFile(string   fileName) 
                { 
                        bool   _result   =   false; 
                        string   downloadUrl   =   GetDownloadPath()   +   fileName; 
                        fileName   =   Directory.GetCurrentDirectory()   +   fileName;                         Stream   responseStream   =   null; 
                        FileStream   fileStream   =   null; 
                        StreamReader   reader   =   null; 
                        try 
                        { 
                                FtpWebRequest   downloadRequest   = 
                                        (FtpWebRequest)WebRequest.Create(downloadUrl); 
                                downloadRequest.Credentials   =   new   NetworkCredential(GetFtpUser(),   GetFtpPassword()); 
                                downloadRequest.Method   =   WebRequestMethods.Ftp.DownloadFile; 
                                downloadRequest.Proxy   =   null; 
                                downloadRequest.KeepAlive   =   false; 
                                FtpWebResponse   downloadResponse   = 
                                        (FtpWebResponse)downloadRequest.GetResponse(); 
                                responseStream   =   downloadResponse.GetResponseStream(); 
                                if   (fileName.Length   ==   0) 
                                { 
                                        reader   =   new   StreamReader(responseStream); 
                                } 
                                else 
                                { 
                                        fileStream   =   File.Create(fileName); 
                                        byte[]   buffer   =   new   byte[1024]; 
                                        int   bytesRead; 
                                        while   (true) 
                                        { 
                                                bytesRead   =   responseStream.Read(buffer,   0,   buffer.Length); 
                                                if   (bytesRead   ==   0) 
                                                        break; 
                                                fileStream.Write(buffer,   0,   bytesRead); 
                                        } 
                                } 
                                _result   =   true; 
                        } 
                        catch   (UriFormatException   ex) 
                        { 
                                WriteLog("0",   ex.Message,   fileName); 
                        } 
                        catch   (WebException   ex) 
                        { 
                                WriteLog("0",   ex.Message,   fileName); 
                        } 
                        catch   (IOException   ex) 
                        { 
                                WriteLog("0",   ex.Message,   fileName); 
                        } 
                        finally 
                        { 
                                if   (reader   !=   null) 
                                        reader.Close(); 
                                else   if   (responseStream   !=   null) 
                                        responseStream.Close(); 
                                if   (fileStream   !=   null) 
                                        fileStream.Close(); 
                        }                         return   _result; 
                }