Keep-Alive value enables clients to establish persistent connections to the WCF services. This configuration offers enhanced throughput because previously established connections can be reused to send subsequent messages to the same server. However, connection reuse may cause clients to become strongly associated to a specific server within the load-balanced farm, which reduces the effectiveness of round-robin load balancing.

What are the 3 things that a WCF Services end point must have?

ABC are 3 things that WCFServices end point must have.

“A” stands for Address: Where is the service?

“B” stands for Binding: How do I talk to the service?

“C” stands for Contract: What can the service do for me

Address – Address specifies where is the service

Binding – Binding specifies how to communicate with service

Contract – Contract specifies what functionalities or operations are exposed by service

Why are WCF Services are considered as loosely coupled?

WCF enables one to create SOA services. A loosely-coupled relationship implies that any client created on any platform can connect to any WCF service as long as the essential contracts are met. WCF Services are considered as loosely coupled because WCF services are not tightly bound to a particular protocol, encoding format, or hosting environment. All of these are configurable.

Close Vs Abort in WCF Client Channels

Difference between Close and Abort in WCF Channels are listed below :

1. Close performs graceful shutdown of Client Channel vs Abort shut downs Client channel immediately.

2. Close waits for in progress calls to complete before closing where as Abort ends in progress calls.

3. Close should not be called in faulted channels as it can throw Communication or Timeout exception where as Abort should be called in faulted channels.

Message Exchange Patterns in WCF

There are three message exchange patterns in WCF  :

1. One way
2. Request Reply
3. Duplex

What is WCF ?

WCF stands for Windows Communication Foundation. WCF was introduced with .NET Framework 3.0. It provides combined features of Web Services , Remoting , MSMQ and COM+ . It is used for building and deploying network distributed service

Below are few important characteristics of SOA are :

1: Boundaries are Explicit

2: Services share schema and contract, not class

3: Services Are Autonomous

4: Service compatibility Is based upon policy

WCF Channels

Channels are building blocks of communication between client and server in WCF.