WindowsDNA with. Net
Reusable software is not a new concept. For eight years, people have been using various forms of Component Object Model (COM). Facts have proved that it is the most successful model of reusable software. COM introduced a "component" concept - it is reusable blocks of code, can be independent of the functional combination of function, such as Microsoft Word expansion into such applications.
Most developers use OLE, COM profound experience of the function. OLE is based on the formation of a group of COM functions, enabling users can be embedded in a document to another document. This function itself seems to be less attractive, but it is the role of an extraordinary: When users will be an Excel file in Word documents to paste, click embedded Excel documents, OLE will be the Word toolbar and menu converted into Excel toolbar and menus.
95 years ago, when the rise of the Internet and fiery seemsè¼when Bill Gates believes that the future network applications software development is not the direction. In the year of the four Cleveland (Cisco, AOL, SUN, Netscape) inside, people do not see the shadow of Microsoft. However, the success of Netscape quickly awakened Microsoft, and Microsoft is to catch up, and with the strong power of the Internet very quickly from the first generation of catch-up into the second - and third-generation Internet leader. But it seems Microsoft is not sufficient to satisfy the appetite, Microsoft spent huge sums of money to build. NET to become the next-generation Internet standard.
We look at the Windows DNA system to comply with the WEB application flaws. Windows DNA system to comply with the COM / DCOM / COM + Distributed Application procedures can be distributed to the entire network function, the RPC DCOM structure in the most top-level architecture, the use of the use of RPC DCOM much easier, but it still inherits RPC a number of deficiencies. The first flaw is: RPC and DCOM are more applicable in the Intranet and not Internet. And the requirements of the RPC DCOM ports in the firewall itself, is not likely to be opened. Such limitations on the line for the development of the WEB application is a very serious problem. The second flaw is the use of COM / DCOM required to be registered or published, it would have a lot of applications and hence it is not an ideal solution. These two deficiencies. NET can use on the Internet-standard XML, SOAP to solve. The third flaw is developed using ASP WEB application, the procedures will be responsible for the script and HTML mixed up together, leading to the pages of very complex scripting language, logic is not clear, readable to the poor not only cause inconvenience to their own programming staff , but also to the maintenance system bring no small difficulties, especially when the application logic changes in demand, changes to these bloated, convoluted explanation of the source code is Meitongjiaoji script. . NET in ASP.NET code and interface can completely separated, and providers of component-based development is WEB application development efficiency greatly improved. The fourth flaw is COM / DCOM platform is relevant, can be based only on WINDOWS platforms. This allows many applications to choose J2EE system. Microsoft's. NET is expected to solve the chronic problems. Sources said that Microsoft introduced in 2003 will be based on the LINUX platform. NET FRAMWORK. Although some people are skeptical, but there is always theoretically possible.
See http://www.uml.org.cn/net/pdf/dp011.pdf
Tags: . Net
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