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This article mainly explains "what is WCF service metadata". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn what WCF service metadata is.

Basic concepts of WCF service metadata

What exactly is WCF service metadata? What is its function? Why should WCF services expose metadata exchange nodes? What does all this have to do with the previous Web Service? These are the problems that often bother us in the process of learning the development of WCF services distributed systems.

What is WCF service metadata

WCF service metadata is the raw description information of service address (Address), binding (communication protocol Binding) and contract (service, operation, data Contract), which are the core parts of WCF service. The metadata exposed by the service includes XSD (elements that appear in the document, attributes that appear in the document, the number of child elements, the order of child elements, whether the element is empty, the data type of the element and attribute, the default and fixed values of the element or attribute) and the WSDL document (information about the method used to describe the service, parameters, number of parameters, order, return value, type of return value, etc.). Disco document (describes the protocol, address, namespace, etc.) of the service.

These key WCF service metadata are all based on XML language description and support the core industry standard protocols. The benefits of XSD are obvious, based on XML, no special syntax, XML Schema supports a series of data types (int, float, Boolean, date, etc.), extensible data model, supports comprehensive namespaces, supports attribute groups, and so on. The key part of these formal WCF distributed services is the pursuit of cross-language and cross-platform.

Why expose service metadata

Once we know the concept of WCF service metadata, we can understand why we should expose the service metadata. The metadata of the WCF service describes the core information of the service, and the client needs to know these characteristics in order to communicate with the service. In order to realize the communication between heterogeneous platforms or systems, the previous technology is to use Web Service. Because it has the advantages of self-description, scalability, platform independence and so on. The client only needs to obtain the relevant information of the service according to the Web Service address, reverse the local code, and invoke the service through the service proxy.

One of the main features of WCF services is cross-platform service interaction. The important reason for exposing service metadata is to solve the key problem of heterogeneous client service interaction. Metadata is based on XML and is self-describing. The client can generate native code based on the reverse sequence of the metadata of the service, whether it is cantileveraged journal vb or java.

Thank you for reading, the above is the content of "what is WCF service metadata". After the study of this article, I believe you have a deeper understanding of what WCF service metadata is, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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