WCF (Windows Communication Foundation) integrates multiple Microsoft technologies for building services, supporting features like web services, .NET remoting, and MSMQ messaging. Key design principles include explicit boundaries, autonomous services, and policy-based compatibility, with a focus on contracts and schemas for defining behavior and data. WCF also offers flexibility in hosting options, supports transactions with ACID properties, and includes a variety of security measures.

2. WHAT IS WCF?
 Integration of several Microsoft
Technologies:
 Web services (ASMX)
 Web service extensions (WSE)
 WS-Security
 WS-Reliability
 WS-Addressing
 .NET Remoting
 MSMQ messaging
 COM+ Transactions

3. WCF DESIGN PRINCIPLES
 Boundaries are explicit
 No attempt to hide communication
 Services are autonomous
 Deployed, managed, and versioned independently
 Services share contracts and schemas, not
types
 Contracts define behavior, schemas define data
 Compatibility is policy-based
 Policy supports separation of behavior from access
constraints

5. CHANNEL MODEL
 WCF supports three types of channel
activity:
 Asynchronous one-way
 Request, wait for reply
 Full duplex two-way

6. STRUCTURE
 Service
 Contract
 Service contract – RPC Interface
 Data contract – Type serialization
 Message contract – Soap message
 Binding
 Transport – HTTP, TCP, MSMQ, …
 Channel type – one-way, duplex, request-reply
 Encoding – XML, binary, MTOM (msg trans optim mech)
 WS-* protocols – WS-Security, …

8. CHANNEL INTERFACES
 public interface IOutputChannel : IChannel
{ void Send(Message msg); }
 public interface IInputChannel : IChannel
{ Message Receive(); }
 public interface IDuplexChannel :
IOutputChannel, IInputChannel {}
 public interface IRequestChannel : IChannel
{ Message Request(Message msg); }
 public interface IReplyChannel : IChannel
{ IRequestContext ReceiveRequest(); }
 public interface IRequestContext : Idisposable
{ Message RequestMessage { get; }
void Reply(Message msg); }

9. SERVICE CONTRACT
 <%@ ServiceHost Language=“C#”
Service=“MyService” %>
[ServiceContract]
public interface IMyService
{
[OperationContract]
string Hello( string name);
}
public class MyService : IMyService
{
public string Hello(string name)
{ return “Hello “ + name; }
}

10. HOSTS
 WCF Services can be hosted in:
 Internet Information Services (IIS)
 Very similar to web services
 Windows services
 Exposing windows service in style of WS
 Console and Winform applications
 New style for socket like functionality

11. OTHER TOPICS
 WCF Security
 Credentials and claims (evidence)
 Transport-level security
 Message-level security
 Federated security model
 Authorization
 Auditing

12. OTHER FEATURES
 WCF Supports transactions
 ACID properties
 Atomicity
 composite operations treated as a unit
 Consistency
 Operations succeed or the system is returned to
prior state
 Isolation
 Each transaction is independent and isolated from
other transactions
 Durability
 If an operation succeeds it becomes durable, e.g.,
committed to a database or other persistant store

13. CONCLUSION
 Convergence of programming models
 Desktop Application
 Web Application
 Windows Services
 Flexible hosting options
 Flexible abstractions

14. we provide online and classroom training for WCF
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