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OTS Solutions is a leading Software Development Company; make use of latest technologies like ASP.NET, WCF, Ajax-enabled WCF and REST WCF Services by its skilled Developers.

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  2. 2. Agenda Introduction to WCF  What is it? Why use it?  Architecture  Fundamentals and the ABCs of WCF  Hosting Tooling Support Handling faults
  3. 3. Introduction to WCF
  4. 4. What is WCF? Stands for Windows Communication Foundation One of the 4 pillars of .NET 3.0 Microsoft’s unified programming model (the servicemodel) for building Service-Oriented Applications
  5. 5. Different technology combined to form WCF.
  6. 6. WCF Architecture
  7. 7. SOA Service  Small program interacted by well defines message exchanges  Agile, Reliable, Stable, Interoperable, Secure Four Tenets  Boundaries are Explicit  Services are Autonomous  Services share schema and contract, not class  Service compatibility is based upon policy
  8. 8. SOA solutions used
  9. 9. SOA Use for Mobile platforms
  10. 10. Windows Communication Foundation WCF provides:  an SDK for creating SOA  a runtime for running Services on Windows Services send and receive messages All messages are SOAP messages WCF takes care of all the plumbing
  11. 11. Why use WCF? Interoperable and Standards based  Supports WS-* protocols Unified Programming Model  Unifies previous models like .NET Remoting, ASMX web services, COM+ etc Productive Programming Model  Declarative  Imperative  Configuration based
  12. 12. WCF Value Proposition Simplicity Flexibility Maintainability Power
  13. 13. WCF: How does it work?
  14. 14. WCF End points
  15. 15. WCF EndpointsEvery service has Address  Where the service is Binding  How to talk to the service Contract  What the service can do
  16. 16. Address Combination of transport, server name, port & path Transport is determined by the binding Examples http://localhost:8001 net.tcp://localhost:8002/MyService net.pipe://localhost/MyPipe net.msmq://localhost/private/MyService net.msmq://localhost/MyService
  17. 17. Bindings Transport  HTTP  TCP  MSMQ Message formats and encoding  Plain text  Binary  Message Transmission Optimization Mechanism (MTOM) Communication security  No security  Transport security  Message security  Authenticating and authorizing callers
  18. 18. Out of the box Bindings BasicHttpBinding  NetTcpBinding WSHttpBinding  NetNamedPipeBinding WS2007HttpBinding  NetMsmqBinding WSDualHttpBinding  NetPeerTcpBinding WSFederationHttp  WebHttpBinding Binding  MsmqIntegrationBinding WS2007FederationHttpBin ding
  19. 19. Contracts Service contracts  Defines operations, communications and behaviours. Data contracts  Defines data entities and parameter types. Fault contracts  Defines error types Message contracts  Defines message formats
  20. 20. Service Contracts [ServiceContract] – Defines a ‘set’ of operations [OperationContract] – Defines a single method [ServiceContract] public interface IService { [OperationContract] string GetData(int value); } public class ConcreteService : IService { public string GetData(int value) { ... } public string OtherMethod() { ... } }
  21. 21. Data Contracts [DataContract] – Specifies type as a data contract [DataMember] – Members that are part of contract [DataContract] public class CustomType { [DataMember] public bool MyFlag { get; set; } [DataMember] public string MyString { get; set; } }
  22. 22. Alternative – DataContract DataContract: created specifically for WCF to serialize types  Attribute contains Name and Namespace properties DataMember is needed to specify which properties/fields will form part of the contract  Contains EmitDefaultValue, IsRequired, Name, Order properties
  23. 23. Metadata Exchange Service can also expose endpoint for Metadata Exchange (MEX) It provides a mechanism for clients to find out about:  Address of other end points  Bindings that are used  Contracts used – Service, Operation, Data, etc
  24. 24. Hosting  IIS  HTTP only  WAS (Windows Activation Service)  Can use any transport  Vista and Windows Server 2008 only  Self hosting  Can use any transport  Can be hosted within Console, WinForms, etc Applications
  25. 25. Tooling Support
  26. 26. Tooling Support Visual Studio  Separate projects for WCF  “Add Service reference” menu  WCF Configuration Editor  WCF Service Host  WCF Test Tool SvcUtil – To generate proxies SvcTraceViewer – To view logs
  27. 27. Handling Faults
  28. 28. SOAP Faults Three main kinds of Exceptions can occur:  Communication errors  Unexpected error on the service  Errors thrown by the service on purpose .NET Exceptions are technology specific All Exceptions come across the wire as SOAP Faults
  29. 29. Faults In WCF, SOAP faults are passed in as FaultException objects Rather than throwing Exceptions, services should throw FaultExceptions Or better still FaultException<T> Throwing FaultExceptions will not fault the proxy and the channel
  30. 30. FaultContracts Specifies what kind of Exceptions, an operation can throw [ServiceContract] public interface IEmployeeService { [OperationContract] [FaultContract(typeof(ValidationException))] public void AddEmployee(Employee e); }
  31. 31. Advantage Its made of a lot of different components, so you can create new components for security, transport, authentication. In WCF, there is no need to make much change in code for implementing the security model and changing the binding. Small changes in the configuration will make your requirements. Its faster than ASMX Its Interoperability, for java, and more. WCF is interoperable with other services when compared to .Net Remoting, where the client and service have to be .Net WCF services provide better reliability and security in compared to ASMX web services.
  32. 32. Disadvantage WCF is Microsofts implementation of SOA and hence its APIs are solely controlled by MS which makes interoperability a bit difficult. To deploy WCF apps, need more underlying hardware resources on the platform on which the WCF applications will be running, since there is an additional layer of abstraction to deal with.
  33. 33. Summary WCF provides a runtime for creating Service Oriented Apps Provides a productive programming model. Takes care of:  Messaging and Exchange formats  All Plumbing: Transaction, Reliability, Security, etc Supports Declarative (via attributes), Imperative (via code) and Configuration based (via config files) programming model ABCs of Endpoints  Address: Where to go?  Binding: How to get there?  Contract: What to do? Hosting  IIS, WAS, Self-hosting
  34. 34. Thank You
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