Agenda

Agenda What Is the Windows

Communication Foundation? How Does It Work? How Do I Use and Deploy It? Bindings Addresses Contracts How to host WCF services in ASP.NET How WCF works inside of ASP.NET

WCF is Our next-generation platform for distributed

systems A set of extensions to the Microsoft.NET

Framework 2.0 Build WCF services in Visual Studiousing

any .NET Language Intelligent code editing, IDE Extensions for WCF,

debugging, re-factoring, code snippets, etc. Visual Basic .NET, Visual C#, etc.

Runs on Microsoft Windows Vista Microsoft Windows XP Microsoft Windows Server 2003

.NET at the coreThe Unified Framework For Rapidly Building

Service-Oriented Applications

WCF combines the functionality from ASP.NET Web Services, .NET Remoting, Message Queuing and Enterprise Services.

Windows Communication Foundation (WCF) ASP.NET Web Service

WCF supports multiple bindings HTTP, WSHTTP, TCP, MSMQ. ASP.NET Web Services supports only HTTP binding.

WCF supports Atomic Transactions*. ASP.NET Web Services does not support Atomic Transactions*.

By default WCF uses SOAP for sending and receiving the messages. But WCF can support any kind of message format not only SOAP.

ASP.NET Web Services can send and receive messages via the SOAP only.

The System.Runtime.Serialization.DataContract and System.Runtime.Serialization.DataMember attributes of the WCF's System.Runtime.Serialization assembly can be added for .NET types to indicate that instances of the type are to be serialized into XML, and which particular fields or properties of the type are to be serialized.

ASP.NET Web Services uses XmlSerializer to translate the XML data (Message Send or received) into .NET objects.

Windows Communication Foundation

• Unifies today’s distributed technologies• Lets you develop/deploy/manage one

model• Visual Studio.NET integration

Unification

• Broad support for Web services (WS-*) specifications

• Compatible with existing Microsoft-distributed application technologies

Interoperability

• Enables development of loosely-coupled services

• Config-based communication

Service-OrientedDevelopment

Unified Programming Model

Interopwith otherplatforms

ASMX

Attribute- Based

Programming

Enterprise Services

WS-*ProtocolSupport

WSE

Message-Oriented

Programming

System.Messaging

ExtensibilityLocation transparency

.NET Remoting

Agenda What Is the Windows Communication

Foundation? How Does It Work? How Do I Use and Deploy It? Bindings Addresses Contracts How to host WCF services in ASP.NET How WCF works inside of ASP.NET

How does it work?Endpoints

Client Service

MessageEndpoint Endpoint

Endpoint

How does it work?Address, Binding, Contract

Client ServiceMessageABC A B C

A B C

Endpoints - All communications with the WCF service will happen via the endpoints. The endpoint is composed of 3 parts (collectively called as ABC's of endpoint) as defines below:Address: The endpoints specify a Address that defines where the endpoint is hosted.Contract: The endpoints specify a Contract that defines which methods of the Service class will be accessible via the endpoint; each endpoint may expose a different set of methods.Binding: The endpoints also define a binding that specifies how a client will communicate with the service and the address where the endpoint is hosted.Various components of the WCF are depicted in the figure below.

How does it work?Behaviours and Metadata

Client Service

MessageABC A B C

A B C

Metadata

Bv BvBv Bv

Proxy ServiceHost()



How do I use it?

Generate Proxy

Pick Endpoint

Define Contract

Implement

Service

Define Endpoint

sHost

Service

Client

Service

How do I deploy it?

Web Host within IIS:

Self-Host within any .NET process:

• Available for any service • Console apps, windowed apps, .NET NT Services …

Building a simple service and client



All About BindingsYou can choose a pre-defined binding:

<endpoint name=“MyService” address=“MyAddress” binding=“netTcpBinding” contract=“IMyInterface” />

NetPeerTcpBinding

NetMSMQBinding

NetNamePipesBinding

NetTcpBinding

WsHttpBinding

BasicHttpBinding

Binding

.NET Peer Peer

.NET.NET via MSMQ

.NET.NET across processesSecure, reliable duplexed

.NET.NET across processesSecure, reliable duplexed

Basis for WS-* interopSupports WS-Security, WS-RM, WS-Tx

Basic Profile 1.1 Interop and Intergration w/ASMX

Purpose

All About BindingsYou can customize a pre-defined binding:<services> <service name=“MyService”> <endpoint address=“MyAddress” binding=“wsHttpBinding” bindingConfiguration=“MyReliableBinding” contract=“IMyInterface” /> <service/></services><bindings> <wsHttpBinding> <binding name=“MyReliableBinding”>

<reliableSession enabled=“true” ordered=“true” </binding> </wsHttpBinding></bindings>

All About BindingsYou can define custom bindings:<services> <service name=“MyService”> <endpoint address=“MyAddress” binding=“wsHttpBinding” bindingConfiguration=“MyReliableBinding” contract=“IMyInterface” /> <service/></services><bindings> <wsHttpBinding> <binding name=“MyReliableBinding”>

<reliableSession enabled=“true” ordered=“true” </binding> </wsHttpBinding></bindings>



All about AddressesAn endpoint address is relative to a base address:

For a Web-Hosted service, the base address is that of its virtual directory

<services> <host> <baseAddresses> <add baseAddress="http://localhost:8000/MyBaseAddress"/> </baseAddresses> </host> <service name=“MyService”> <endpoint address=“MyEndpointAddress” binding=“wsHttpBinding” bindingConfiguration=“MyReliableBinding” contract=“IMyInterface” /> <service/></services>



All About Contracts

• Service Contract: Describes the operations a service can perform. Maps CLR types to WSDL.

• Data Contract: Describes a data structure. Maps CLR types to XSD.

• Message Contract: Defines the structure of the message on the wire. Maps CLR types to SOAP messages.



Hosting Services in ASP.NET Write your service as usual:

[ServiceContract] [OperationContract] etc.

ServiceHost’s are represented as .svc files:<% @ServiceHost Service=“HelloService” %>

Service attribute is a CLR type name Matches <service name=“xxx”> from

web.config

Where can I put my service code? Anywhere you can put code in

ASP.NET: Inline in the .svc file In a .cs/.vb in App_Code In a class library (.dll) located in \bin

WCF plays nicely with ASP.NET’s dynamic compilation system

Which project type should I use? Services can be built in any project type

Web projects Class Libraries

Class libraries have benefits Decouples implementation from hosting environment Can test services in other hosts (e.g. console apps)

during development However, WCF doesn’t care which project type you

use…use what makes sense for you

Hosting WCF in ASP.NET



IIS Worker Process(w3wp.exe)

w3wp.exe

ASP.NET

w3wp.exe

ASP.NET Managed Hosting Layer(System.Web.Hosting, System.Web.Compilation)

ASP.NETPage Framework, UI, Controls,HTTP Runtime(System.Web, System.Web.UI)

w3wp.exe

ASP.NET Managed Hosting Layer(System.Web.Hosting, System.Web.Compilation)

ASP.NETPage Framework, UI, Controls,HTTP Runtime(System.Web, System.Web.UI)

WCF Service Model(System.ServiceModel)Can share state

WCF and the HTTP Pipeline

IISAS

P.N

ET

HTTPRequest

Service Implementation

Process Host

WCF HttpModule(grabs *.svc)

WCF HTTP Transport

Protocol Channels

Dispatcher

HTTPResponse

Other HttpModuleOther HttpModule

Other HttpModule

Why the split?

Two technologies, different priorities

WCF: consistency across transports and hosting environments

ASP.NET: optimize for HTTP applications hosted in IIS

Becomes very important on IIS7/WAS WAS == Windows Process Activation

Service

Implications

ASP.NET platform features still work for ASP.NET Forms auth Session state File/URL authorization

They just don’t apply to WCF by default

Summary What Is the Windows Communication


Date post:	14-Feb-2016
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