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This is a getting started tutorial to Windows Communication Foundation (WCF) Services. I have discussed a simple service to calculate the area of a rectangle; yup, very simple ;)

1. First you need to download and install Visual Studio 2005 extensions for .NET Framework 3.0 (Windows Workflow Foundation).

Oops, looks like it needs a windows validation (bit of a problem if you have a pirate copy :P )

2. Once the installation is complete, start Visual Studio to create the project.

Goto File->New->Web Site, and you’ll see a new template called WFC Service.

Click OK to create an empty WCF Service.

3. Time to get started with the coding

Service.svc

<% @ServiceHost Language=C# Debug="true" Service="GeometryService" CodeBehind="~/App_Code/Service.cs" %>

Only a small change here – the name of the service

Web.config

<?xml version="1.0"?>
 
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
  <system.serviceModel>
    <services>
      <!-- Before deployment, you should remove the returnFaults behavior configuration to avoid disclosing information in exception messages -->
      <service name="GeometryService" behaviorConfiguration="GeometryServiceBehavior">
        <endpoint contract="IGeometryService" binding="wsHttpBinding"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="GeometryServiceBehavior" >
          <serviceDebug includeExceptionDetailInFaults="true" />
          <serviceMetadata httpGetEnabled="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
 
  <system.web>
    <compilation debug="true"/>
  </system.web>
 
 </configuration>

Enable metadata publishing and change the name of the service.

Service.cs

using System;
using System.ServiceModel;
using System.Runtime.Serialization;
 
// A WCF service consists of a contract (defined below as IMyService, DataContract1), 
// a class which implements that interface (see MyService), 
// and configuration entries that specify behaviors associated with 
// that implementation (see <system.serviceModel> in web.config)
 
[ServiceContract()]
public interface IGeometryService
{
 [OperationContract]
 int GetArea(Rectangle rect);
 [OperationContract]
 int GetPerimeter(int width, int height);
}
 
public class GeometryService : IGeometryService
{
 public int GetArea(Rectangle rect)
 {
  return rect.Area();
 }
 
 public int GetPerimeter(int width, int height)
 {
  Rectangle rect = new Rectangle(width, height);
  return rect.Perimeter();
 }
}
 
[DataContract]
public class Rectangle
{
 int width;
 int height;
 
 public Rectangle(int width, int height)
 {
  Width = width;
  Height = height;
 }
 
 [DataMember]
 public int Width
 {
  get { return width; }
  set { width = value < 0 ? 0 : value; }
 }
 
 [DataMember]
 public int Height
 {
  get { return height; }
  set { height = value < 0 ? 0 : value; }
 }
 
 public int Area()
 {
  return Height * Width;
 }
 
 public int Perimeter()
 {
  return 2 * (Height + Width);
 }
}

This is the code for the service.

4. Run the service – click F5 :)

This is what you get on the browser. So, lets do what they want.

5. Run the following on you command on Visual Studio Command Prompt

svcutil.exe http://localhost:1479/GeoWFCService/Service.svc?wsdl

Watch out, the path might be different ;) . And if you don’t know what Visual Studio command prompt is

6. Let’s create the client

Create (or rather add) a new project; this could even be a website

7. Then run the service – Ctrl + F5

8. Add a web reference to the service

8. Copy the GeometryService.cs created by svcutil in step 5 to the clients working (main) folder and add them to the project

You should also copy the configurations of output.config created by svcutil to app.config

9. Again time for coding

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
namespace GeoWFCClient
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }
 
  private void calculateButton_Click(object sender, EventArgs e)
  {
   GeometryServiceClient gsclient = new GeometryServiceClient();
 
   /* The overloaded constructor of Rectangle is not present here */
   Rectangle rect = new Rectangle();
 
   rect.Width = Int32.Parse(widthTextBox.Text);
   rect.Height = Int32.Parse(heightTextBox.Text);
 
   areaTextBox.Text = gsclient.GetArea(rect).ToString();
   perimeterTextBox.Text = gsclient.GetPerimeter(rect.Width, rect.Height).ToString();
  }
 }
}

Set the textboxes and labels with appropriate names.

10. When you compile you’ll get a set of error because some assemblies are not referenced. Add references to them

11. Now see how it works

Start the service if haven’t done so already, and run the client

Wow! It works :D

Ok, hope you learned something with this and I got to go study for exam :P

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I dropped at this crazy and cool site http://hey-genius.com, while searching for sample recruitment advertisements to design an advertisement for Paradox.

Hey Genius calls for the genius inside you to work at Microsoft. This site has some cool challenges, a forum, videos and articles which shows you (may be also get a bit of experience) how it is like to work at Microsoft. It is a different site (ya, sometimes you find hard to navigate :P ) and worth giving a visit.

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They have given the results of Imagine Cup 2007 – Web Design competition. Few of my friends (Sandaruwan, Keshan, Nuwan and Kasun) participated and they had an innovative, useful and nice (beautiful) submission – Acso.

I was so sure that these guys would be selected to the top 6. When I heard that they were not selected and had a look at the submissions which were selected (iPhysics, Scrooba!, …), I felt that it wasn’t fair.

As far as I could feel their submission had all the qualities / characteristics the Imagine Cup organizer’s had asked for :

  • Reach : this site doesn’t require flash plug-ins or any other plug-ins to be downloaded and can be viewed on any browser
  • Accessibility : this is the only feature which is not preset on this, but I didn’t see it on other projects as well
  • Innovation & Differentiation : the idea, features and design was innovative and creative – I haven’t seen anything similar before
  • Usability : although it has not achieved zero-training, it can be used by any user who has used the internet before. The site is based on web 2.0 and it has a small help on the sidebar which guilds you in everything.
  • Maintainability : well I don’t know much about this as I haven’t seen their code, but I know for sure that they are good programmer’s who good programming practices since I have worked with them
  • I was passionate about Imagine Cup because of what I heard from them – the team work, innovation and creativity required (also the prizes ;) ), and I wanted to compete in next year. But now I’ll give it a second thought.

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