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This article will explain in detail how to use VB.NET Web Service for you. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

I. what is Web Service and why do we need it:

The main function of Web Service is to achieve cross-platform function calls. At the same time, because XML is used for data exchange in Web Service, there is no need to worry about the impact of the firewall when using Web Service. Because Web Service integrates various functions and provides a friendly interface. Therefore, software reuse can be realized in Web Service.

In addition, the call of Web Service is very simple, to put it simply, using Web Service on the Internet is as simple as calling local components, that is, calling components on the Internet through the HTTP protocol. As for the specific invocation method, please refer to paragraph 7 of section 5 of this article. So Web Service is a component call on the Internet.

II. Standards and protocols related to VB.NET Web Service:

Web Service ensures the dynamic connection with the program and realizes its secure invocation through a series of standards and protocols. The main standards and protocols are: XML, WSDL, SOAP, HTTP, UDDI. These standards and protocols are briefly described below.

1. XML is used to exchange data between XML:Web Service and between Web Service and application. Because VB.NET Web Service is based on XML, Web Service not only has the advantages brought by XML, but also has the disadvantages brought by XML. Among them, the most important disadvantage brought by XML is that Web Service will occupy a lot of CPU resources, because XML data can only be used by the system after multi-step processing. Therefore, even if you call a less functional Web Service, it will feel very slow, so the network requires a lot of hosts running Web Service.

2. HTTP: the application provides the HTTP protocol to call Web Service. So HTTP acts as a channel in the process of calling Web Service.

3. WSDL: short for Web Service description language. It is in XML format, and its purpose is to describe Web Service, to indicate the application and how to interact with Web Servie. When a Web Service service is implemented, the interface of the Web Service must be told in order for another program to call it. Such as the name of the service, the name of the machine on which the service is located, the listening port number, the type of parameters passed, and so on. WSDL is the standard that defines the description of Web Services.

4. UDDI: it is the abbreviation of Universal Description, Discovery, and Integration. To put it simply, UDDI is used to store and find WSDL description files centrally and acts as a directory server.

5. SOAP: is an abbreviation for "Simple Object Access Protocol", that is, simple object access Protocol. SOAP is a messaging protocol that specifies how information is transmitted between Web Services.

This is the end of the article on "how to use VB.NET Web Service". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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