File Transmission Key Technology Research And The System Realization Based On C#.NET

In recent years, with the constant developing of the building of standard schoolsfor compulsory education and the overall implementation of school informationmanagement system project in Kunshan, the schools in Kunshan have developed a lot ofeducation information management systems based on Web application. Theseinformation systems supply word, image, music, language, video and animationprocessing, which makes the lessons vivid and dramatic. But how to realize thetransmission and sharing of the multimedia files and information under the Webenvironment is the problem to be solved first for the most education informationmanagement systems in order to realize education information management systeminterlinkage.To achieve a file between different computer terminal systems under theenvironment of network sharing and mutual transmission mechanism using the filetransfer service, is an important function modules to achieve the education informationmanagement system. It’s an important way for users to access information and resources,too. The paper analyses the transmission of Web documents in the interconnection andresource sharing of education information system in the process of construction ofdigital campus in primary and secondary schools of Kunshan and focuses on theresearch of the B/S architecture theory, ASP.NET, SQL SERVER2005, C#.NETdevelopment language and AJAX and JavaScript technology necessary for therealization of the system, using B/S mode of three layers architecture as the overallstructure of the system, the development and utilization of prototyping method tocomplete the Web file transfer system based on C#.NET architecture. Firstly, the papertalks about the problems in Web file transmission under the environment of network andthe research about it. It also discusses the core C#.NET technology in the developmentof Web files transmission system. The paper finishes the analysis of Web file transfersystem, which divides the modules into details, using structured analysis method toobtain the requirements of the main function modules of the system and the main dataflow. It reorganizes the analysis of system demand according to the requirements of theinstructions on the software specification requirement, and it also gives the mainanalysis process on the aspects of system functional requirements, performance requirements, data flow diagram and system design requirements and other factors. Theoverall structure design of Web file transmission system and the detailed design arecompleted in the paper. The paper not only makes a detailed design on the core classesin the realization of the system and the relationship between the data structure and itspattern but also lists the main program key code. It expatiates the debugging and testingon the system.To realize this technically, this paper proposes the following ways: to upload ormass upload Web files by means of multi threads, AJAX no refreshing upload andHTTP resume broken download; to realize the data user query interface with the help ofAJAX technology; to realize downloading preview of Multimedia Web files by usingp2p downloading function in popular players. The system supports multi file and largefiles upload, and can display the real-time uploading progress. It also supports resumebroken download. The system can greatly meet the current needs of file transmissionbased on web.