TAILIEUCHUNG - BeginningASP.NET 2.0 with C# PHẦN 7

Họ giới thiệu như là một phần của NET Framework trong hóa thân đầu tiên của mình (mặc dù họ đã có mặt trong Java cho lâu hơn rất nhiều). Các dịch vụ Web là một phương pháp làm cho thông tin có sẵn trong một cách tiêu chuẩn hóa có thể được truy cập bởi bất kỳ ứng dụng phát triển trên web. | 12 Web Services Web services have been the next great thing for a little too long now. They were originally introduced as part of the .NET Framework in its first incarnation although they have been present in Java for a lot longer . Web services are a method of making information available in a standardized way that could be accessed by any developer s application over the Web. Web services can form a library or shared repository of information that could be anything from the latest weather forecast a map of your local amenities a mathematical function calculator to the tracks and album cover of the CD that you just inserted into your CD-ROM drive. You should be aware though that a web service on its own isn t an application. Web services aren t rendered as web pages or as executable files .exe they come completely shorn of a user interface. It s up to you as a developer to use them and integrate them into your applications. They are there to save you time and effort by reducing code duplication. They can be used in one of two ways. You can create a web service that is exposed to the web to share with other developers and other applications. Or you can search for a web service that can be added to your own application. They are similar to plug-ins in that respect. For example if your application is a company web site and you want to include directions to company headquarters rather than scan in a map or attempt to hand-draw one in a graphics tool why not use one of the web services that makes sections of maps available online The information contained in the web service is wrapped up as an XML document in other words plain text so that worries about platform-specific concerns such as whether you re accessing them on an old Windows 98 machine or a turbo-powered Powerbook simply evaporate. Web services aren t really anything new either components have been performing a similar trick for many years now. However there are some crucial differences. Components had to be

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