Read e-book online Programming WCF Services, 4th Edition: Design and Build PDF

By Juval Lowy, Michael Montgomery

Programming WCF prone is the authoritative, bestselling advisor to Microsoft's unified platform for constructing smooth, service-oriented purposes on home windows. Hailed because the definitive therapy of WCF, this advisor presents distinct perception, instead of documentation, that can assist you research the themes and talents you wish for construction maintainable, extensible, and reusable WCF-based purposes. Authors Juval Lowy - one of many world's best .NET experts—and Michael Montgomery have revised this version to incorporate the productivity-enhancing gains of .NET Framework 4.6, in addition to the newest WCF rules and strategies. via instructing you the why and the how of WCF programming, this booklet might help you grasp WCF and make you a greater software program engineer.

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Extra resources for Programming WCF Services, 4th Edition: Design and Build Maintainable Service-Oriented Systems

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Open(); However, with the exception of some threading issues discussed in Chapter 8, open‐ ing multiple hosts this way offers no real advantage. In addition, opening multiple hosts for the same type does not work with base addresses supplied in the config file and requires use of the ServiceHost constructor. Advanced hosting features The ICommunicationObject interface that ServiceHost supports offers some advanced features, listed in Example 1-4. Example 1-4. info | 19 void EndOpen(IAsyncResult result); CommunicationState State {get;} //More members } public enum CommunicationState { Created, Opening, Opened, Closing, Closed, Faulted } If opening or closing the host is a lengthy operation, you can do so asynchronously with the BeginOpen() and BeginClose() methods.

Bindings There are multiple aspects of communication with any given service, and there are many possible communication patterns. Messages can follow a synchronous requestreply or asynchronous fire-and-forget pattern, messages can be bidirectional, mes‐ sages can be delivered immediately or queued, and the queues can be durable or volatile. As discussed previously, there are many possible transport protocols for the messages, such as HTTP (or HTTPS), TCP, IPC, MSMQ. There are also a few possi‐ ble message encoding options.

Choosing a Binding When choosing a binding for your service, you should follow the decision diagram shown in Figure 1-5. info Figure 1-5. Choosing a binding The first question you should ask yourself is whether your service needs to interact with non-WCF clients. , a WSI-basic pro‐ file). The downside of this choice is that you cannot take advantage of most of the standard WS-* protocols. If, however, the non-WCF client can understand these standards, you can instead choose the WS binding. If you can assume the client is a WCF client and requires offline or disconnected interaction, choose the NetMsmqBind ing, which uses MSMQ for transporting the messages.

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