WCF tutorial – Learn WCF quickly
WCF stands for Windows Communication Foundation and used for developing distributed system.
WCF services can communicate with.Net applications and Non-Microsoft technology as well.
- (A) Address – Where to bind, which is also called as EndPoint
- (B) Binding – How to bind
- (C) Contract – What to bind
ASMX service sends and receives data over HTTP protocol; however, WCF is able to exchange messages over any transport protocol.
The contract in WCF:
There are multiple contracts available in WCF. Generally, a standard way to describe what exactly a service will do.
Service Contract – Defines the operation that a service will perform.
Data Contract – Defines the classes
Fault Contract – Defines the errors raised in service
Message Contract – Defines what data need to exchange
Protocol that WCF uses:
HTTP – eg http://localhost:80
TCP – net.tcp//localhost:90
MSMQ – net.msmpq://localhost:91
Hosting in WCF:
There are 3 types of hosting options available in WCF
IIS-
Self Hosting-
WAS-
System.ServiceModel is the namespace which is used to access WCF Service.
Types of Binding in WCF – Binding defines how an endpoint communicates to the world. It also defines the transport protocol i.e. HTTP, TCP
BasicHttpBinding –
NetTcpBinding
WSHttpBinding
NetMsmqBinding
What is Data Contract Serialization?
What is Proxy and How to generate it?
Proxy is a class that exposes the service contract.
A proxy can be generated using Visual Studio by adding service reference; another way to generate proxy is by using Svcutil.exe command. Need to provide the service address and proxy file name (optional). Default proxy name is output.cs
Syntax :
Svcutil http://serviceurl/myservice.svc /out:MyProxy.cs
WCF client Configuration:
<system.servicemodel>
<client>
<endpoint name = “EndPoint1” address=”endpointurl” binding =”wsHttpBinding” contract =”IContract”/>
</client>
</system.servicemodel>
Operation Overloading in WCF Service:
By default operation, overloading is not allowed. But using Name property with operation contract can resolve this issue.
Ex:
[ServiceContract]
public interface IService1
{
[OperationContract(Name=“Int Parameter”)]
string GetData(int value);
[OperationContract(Name=“String parameter”)]
string GetData(string value);
}
Main components of WCF :
Service Class
Hosting
Endpoint
Isolation level in WCF:
Read Uncommitted – An uncommitted transaction can be read. This transaction can be rolled back later.
Read Committed – Will not read data of a transaction that has not been committed yet.
Repeatable Read – Locks placed on all data.
Serializable – Does not allow other transactions to insert or update data until the transaction is complete.
