Based On C#.net Framework Of Three Layersof Han Shi Digital Enterprise Purc Hase-sell-stock Management System

In recent years, our enterprise informatization has been gradually rising. China's high-tech industries will play an important role in national enterprises. Therefore, how to improve its production and operation efficiency has become the problem which must be considered in the process of the enterprise's development. For most enterprises, under such rapid development of the economic background, purchase-sell-stock management is an important means to improve the production efficiency. And in enterprise management, the purchase-sell-stock management is an important link of management. It is not only related to the large amount of data, but also requiring the fast-speed of the informational feedback. In some sense, it can have a direct influence on the management and economic of the enterprise. But if there is a leak, it may make a great loss to the enterprise directly.Therefore, this paper mainly discusses how to use the three-layer structure and design pattern in C#net development platform, which will design the general system with good structure of the purchase-sell-stock. The development of the whole system can be divided into four parts:firstly, by using some software engineering knowledge, I have made a detail survey of the digital's business needs of Hanshan Normal University. What's more, use the results of the analysis to analyze the basic requirements of this system. After receiving the basic functions of the system requirements, I use the principle of the system to find an E-R chart, then to design the database system which base on it. Secondly, using object-oriented analysis method and the object-oriented modeling tools UML to analyze and design the system structure. During the process of the design, the introduction of the commercial software development process of three-layer structure method is used to improve its system framework. The problem will be divided into several little problems to deal with. And the separation between the various levels with high cohesion and low coupling will meet in each other's public interface. Finally, using the design patterns of software development process, especially improving the abstract factory model which has been divided into good structure, will make the characteristics of the system framework maintainable, portable, and reusable.Through the practice, we can learn that before the design of the enterprise application system, especially the software for database management system, the requirements for the software and the design for the software framework is very important, a ny defects will waste more time in the development and even affect the economic efficiency of enterprises. Therefore, whether the software development in what kind of period, must grasp the key points.while each period should make good use of the development approach and the design patterns of enterprise software, to improve the efficiency greatly and reduce the cost.