Learn WCF at ASIT

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

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

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

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, …

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); }

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; }
}

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

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

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

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

we provide online and classroom training for WCF
For More Details
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Learn WCF at ASIT

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