Developing and Consuming WCF Service - Separating Service, Contract, Proxy and Client

Few words about WCF

WCF is unified communication platform from Microsoft and most preferred choice for SOA development like earlier we have asmx webservice. WCF provide all the powerful cross platform communication needs and flexibility of hosting in IIS,Windows applications, Console applications, Windows service,MSMQ and various protocols support (like http, named pipes,TCP etc.)and bindings.

The problem area

In Visual studio, WCF service development is as easy as asmx webservice, but service,endpoint (.svc file) contract and configuration all jumbled in one project. And we have to maintain a large web.config file. Most of the WCF hosting and binding configurations are reside inside service configuration file. Traditionally we need to create proxy in each and every project to consume the WCF service, so if we need to consume WCF service in multiple project projects , than need to create same proxy class in different projects. It’s is code duplication. And if there is any change in the WCF service, we need to change the config file and proxy for each and every project.

Solution

If we have one proxy for all projects,separate out contract and service and maintain configuration on the hosting environment instead of within service, would be more suitable for large enterprise systems as it would be up to the host how WCF service would be exposed (configuration at the host point not at service side). I have developed a sample that decoupled service, contract, host and proxy from the client.

Code Discussion

I have created 5 diffeent projects each one for Contract,service,Host,proxy and client.

Contracts and Service projects are class libraries and doesn't have any configuration file.

WCF Proxy is again a class library and client is a windows application, both proxy and client is having the almost the same config entry.

Service is exposing two simple methods GetPrice and GetProductName.

Here the proxy class is derived from the ClientBase class and implementing the IAWContract(service contract) and calling the service through WCF inner channel.

We can also create Channel by using the CreateChannel method of channelFactory and call the service through created channel.

//WCF Proxy class

namespace WCFProxy

{

public class Proxy:ClientBase,IAWContrProxy

{

public string GetProductName(int ProductID)

{

return Channel.GetProductName(ProductID);

}

public string GetPrice(int ProductID)

{

return Channel.GetPrice(ProductID);

}

}

}

/>

//WCF hosting

public static void Main() {

ServiceHost svcHost = new ServiceHost(typeof(WCFService.AWService));

svcHost.Open();

Console.ForegroundColor = ConsoleColor.DarkGreen;

Console.WriteLine("Service is running...");

Console.ReadLine();

}

 

binding="netTcpBinding" contract="WCFContracts.IAWContract" />

SOURCE:http://www.codeproject.com/KB/WCF/wcfservicelargesystems.aspx