A Simple Example of WCF Service

Mahak Gupta

7y801.8k25100Article

WCF ServiceWCF TutorialWCF exampleICalcService.cs

25 Comments

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Timmy Curtin5y ago
Does the port have to be 8731?
Sangaralingam S9y ago
Good for Beginners
Ramesh Palaniappan10y ago
Good one
Subash10y ago
Useful one
kalu singh rao10y ago
Nice...
Raja10y ago
Good one..
Venugopala Rao Divvala10y ago
Good for Beginners
Amatya Agyey10y ago
Very Nice .. Keep it up
Ajeet Mishra11y ago
usefull
Sharad11y ago
good one...
Shalin Bhavsar11y ago
How to call WCF in asp.net C#?which is the another setting to provide security in WCF?is there any word or PDF with example then please share it [email protected]
Partha Saradhi11y ago
It is good to learn programming in WCF
Shalin Bhavsar11y ago
I am using xamarin and want to call WCF service ?
Prem Verma11y ago
well discription
Gaurang Bhadani12y ago
good
sagar venkatesh12y ago
Hi Mahak, the article is very good. i have one more question regarding WCF authentication, I have developed a WCF project which contains 2 simple services. In that 1 is for login authentication and another is just for displaying a data. i have used digest authentication (DigestAuthenticationHostFactory). Now it is authenticating for that service which ever is called first. but I want only to authenticate for Login service. How can this be achieved ?Its not mandatory that login service will be called first.
Neelam Parmar12y ago
Really Good One... Easy to understand for beginners... thanks a lot
Darling Doll12y ago
With VS2013 netframework 4.5, an error: AddSync is not supported in the WCF test client because it uses type System.Threading.Tasks.Task System Double mscorlib , can you help me? Thanks. happy 2014
Mahak Gupta12y ago
Thanks
Santosh Kumar12y ago
Very easy and nice description.
Former member13y ago
Nice Article
Chandan Sinha13y ago
Very good working example of WCF. Great Work! Thanks.
Vinod Kumar Chennegowda13y ago
Great explanations
Shaiju Janardhanan13y ago
Thank U
Steve Blodgett14y ago
Thanks for the great article!

Introduction

Here we look at an example of a WCF Service in which we create a service for applying simple calculator functions (like add, subtract, multiply and divide).

Step 1: First we open the Visual Studio.

Click on File:-> New:-> Project.
After that, the following window will appear.

Here we select the WCF in the Project Type and then we select the WCF Service Library in it. After that, we specify the name of this library to be Calc (which we can define in the Name Section). And then we click on the OK Button.

Step 2: When we click on the Ok Button, the Calc.cs will be opened. In the Solution Explorer, we delete the following files, since we want to create the service from the start.

Step 3: In Calc.cs, first we create the class public and then we create it as a WCF Data Contract. For this, we first add the namespace System.Runtime.Serialization. And then we write the following code.

Code

using System.Runtime.Serialization;
namespace Calc {
[DataContract]
public class Calc {
[DataMember]
public double n1;
[DataMember]
public double n2;
}
}

Step 4: After that we add another class.

Here we name it ICalcService.cs.

Step 5: Now we declare as an interface not a class so we change the code like this.

Code

public interface ICalcService
{}

Here we type the following operations:

public interface ICalcService
{
double Add(double n1, double n2);
double Subtract(double n1, double n2);
double Multiply(double n1, double n2);
double Divide(double n1, double n2);
}

After that, we delare it as a Service Contract, which is in a different namespace: System.ServiceModel. Now we look at the code:

using System.ServiceModel;
namespace Calc
{
[ServiceContract]
public interface ICalcService
{
[OperationContract]
double Add(double n1, double n2);
[OperationContract]
double Subtract(double n1, double n2);
[OperationContract]
double Multiply(double n1, double n2);
[OperationContract]
double Divide(double n1, double n2);
}
}

Step 6: After that we add another class: CalcService.cs. It is an actual service implementation class, so here we can specify the ICalcService like this.

Code

public class CalcService:ICalcService
{}

Here we implement an interface by right-clicking and choosing the option Implement Interface Explicitly:

Now we add the ServiceBeahvior like this:

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]

It specifies the behavior of our service and InstanceContextMode.Single means it creates a single instace of our service. Now we write the following code in it.

using System.ServiceModel;
namespace Calc
{
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
public class CalcService: ICalcService
{
public double Add(double n1, double n2)
{
return n1 + n2;
}
public double Subtract(double n1, double n2)
{
return n1 - n2;
}
public double Multiply(double n1, double n2)
{
return n1 * n2;
}
public double Divide(double n1, double n2)
{
return n1 / n2;
}
}
}

Step 7: Now we try to run the program; it can not be run since it is not yet completed. Now right-click on the App.config file and select the Edit WCF Configuration option.