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WCF Interview Questions with answers.R4R provide WCF Languages study materials in easy way.
Introduction of WCF
Presentation Foundation is Microsofts next generation UI framework to create
applications with a rich user experience. It is part of the .NET framework 3.0
(Window Communication Foundation) is a solution for developers to work in
distributing environment. WCF create communication between applications. Before
WCF, the technologies to make communication between applications were ASMX, .NET
remoting, and COM+. WCF provides a common platform for all .NET communication.different technology combined to form WCF.
WCF is a framework that is used for developing, configuring, exposing,
and hosting services. All service providers were agree on SOAP concept for
making communication between application before WCF. The idea of WCF is a
combination of SOAP and web service.
There are two categories of classes in WCF.
WCF services expose functionality through one or more endpoints. Clients
communicate with the service's endpoint. In configuring an end points there are
three components require.
WPF is actually a set of assemblies that build up the
entire framework. These assemblies can be categorized as
- Managed Layer
- UnManaged Layer
- Core API
Managed Layer :
Managed layer is a collection of number of assemblies. These assemblies
the WPF framework, communicates with lower level unmanaged API to render its
content. The few assemblies that comprise the WPF framework are :
Visual from which all shapes and controls are Derived in PresentationFramework.dll.
It is used to hold even more basic elements which are capable to be used outside the WPF
environment like Dispatcher object, DependencyObjects.
I will discuss each of them later.
- PresentationFramework.dll :
It is used to Creates the top level elements like layout panels, controls, windows, styles
it is used to holds base types such as
Media Integration Library Core. It used to translate the WPF higher level
objects like layout panels, buttons, animation etc into textures that Direct3D expects.
It is the main rendering engine of WPF.
Unmanaged Layer (milcore.dll): The unmanaged layer of WPF is called
This is low level API which is used for imaging support in WPF
applications. WindowsCodecs.dll comprises
of a number of codecs which encodes / decodes images into vector graphics that
would be rendered into WPF screen.
features in WCF
- Dynamic Service and End Point discovery
- Intermediate Routing Pattern ( Generic Routing Services)
- Discovery announcement
- Simplified Configuration
- Protocol bridging and Fault tolerance
- Standard End Points.
- .svc-less activation of REST services or making REST URI nice.
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
Supports Scaling/Load Balancing
WCF has integrated logging mechanism, changing the configuration file
settings will provide this functionality. In other technology developer has to
write the code.
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
A drawback would be that, WCF is Microsoft's implementation of SOA and hence
its APIs are solely controlled by MS which makes interoperability a bit
difficult. Also, to deploy WCF apps, you will 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.
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