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Posted 25 Sep 2009

Creating and Consuming Your First WCF Service

, 25 Sep 2009
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In this article, I will examine how to create and consume a WCF service. WCF is next-generation programming platform and runtime system for building, configuring and deploying service-oriented applications.

Introduction

In this article, I will examine how to create and consume a WCF service. WCF is a next-generation programming platform and runtime system for building, configuring and deploying service-oriented applications. For more details, please see here.

Creating a WCF Service

I will create a stock service to demonstrate a WCF service. To create a WCF service, please follow these steps:

  1. Launch Visual Studio 2008.
  2. Click on File -> new -> project, then select WCF service application.
  3. It will create a WCF service application template.

I will delete the default contract and then create an IStock contract as shown below.

Using the Code

[ServiceContract]
    public interface IStock
    {
        [OperationContract]
        Stock GetStock(string Symbol);   
    }

The above contract has one method that returns a stock object for a given symbol. Here is our Stock class that has Symbol, Date, Company and Close properties respectively.

[DataContract]
    public class Stock
    {
        [DataMember]
        public string Symbol { get; set; }
        [DataMember]
        public DateTime Date { get; set; }
        [DataMember]
        public string Company { get; set; }
        [DataMember]
        public decimal Close { get; set; }
    }

Next, I will delete the default service and create a Stock service that will implement the Istock contract as shown below:

public class Stocks : IStock
   {
       #region IStock Members
       public Stock GetStock(string Symbol)
       {
           Stock st = null;
           switch (Symbol.ToUpper())
           {
               case "GOOG":
                   st = new Stock { Symbol = Symbol, Date = DateTime.Now,
           Company = "Google Inc.", Close = 495 };
                   break;
               case "MSFT":
                   st = new Stock { Symbol = Symbol, Date = DateTime.Now,
           Company = "Microsoft Corporation", Close = 25 };
                   break;
               case "YHOO":
                   st = new Stock { Symbol = Symbol, Date = DateTime.Now,
           Company = "Yahoo! Inc.", Close = 17 };
                   break;
               case "AMZN":
                   st = new Stock { Symbol = Symbol, Date = DateTime.Now,
           Company = "Amazon.com, Inc.", Close = 92 };
                   break;
           }
           return st;
       }
       #endregion
   }

In the above service, I implemented IStock contract that has a GetStock method which returns stock object for a given Symbol.

Now, I will have the following endpoints in my web.config:

<service behaviorConfiguration="WcfSample.Service1Behavior" name="WcfSample.Stocks">
<endpoint address="" binding="wsHttpBinding" contract="WcfSample.IStock">
<identity>
 <dns value="localhost"/>
 </identity>
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
</service>

In the above configuration, we have address="" which is localhost, binding="wsHttpBinding" and contract="WcfSample.IStock".

Now I will compile the service and build a client to consume the service.

Creating a Client to Consume Service

To create a client, I will create a web application. Please follow these steps.

  1. Right Click on Solution -> Add -> new project, then select ASP.NET web application.
  2. It will create a web application template.
  3. Now, I will add the service reference. To add a service reference, select client application, then add a service reference. Since our client is in a same solution, I will click discover and service in the solution as shown below:

  4. In default.aspx, I will create a simple UI, a textbox to enter the stock symbol and a button to call the service to get stock information. Here is our code behind:

    ServiceReference2.StockClient sc = new ServiceReference2.StockClient();
    ServiceReference2.Stock st = sc.GetStock(TextBox1.Text.Trim());
    StringBuilder sb = new StringBuilder();
    sb.AppendFormat("<B>Company:</B> {0}<br />", st.Company);
    sb.AppendFormat("<B>Date: </B>{0}<br />", st.Date);
    sb.AppendFormat("<B>Close: </B>{0}<br />", st.Close);
    sb.AppendFormat("<B>Symbol: </B>{0}<br />", st.Symbol); 
    Label1.Text = sb.ToString(); 
  5. Here are a few screenshots from our final application:

Summary

In this article, we examined how to create and consume a WCF service. As you can see, creating and consuming WCF service with Visual studio 2008 is pretty simple.

History

  • 25th September, 2009: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Farooq Kaiser
Software Developer (Senior) http://www.Fairnet.com
Canada Canada
16+ years of complete software development life cycle experience for web based applications, SOA, IOS and distributed, primarily using ASP.NET, MVC, Entity Framework, WEBAPI 2, LINQ, WCF, C#, XML, XSLT, AJAX, Winforms, JavaScript, JQuery, Angular JS, Typescript, Google APIs, C/C++, VB.NET, JAVA, Open XML, SSIS,SSRS, Amazon Web Services, Microsoft Azure, Python, PHP, Open Source Frameworks and design patterns.

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Comments and Discussions

 
GeneralMy vote of 5 Pin
Christian Amado10-Aug-12 8:42
memberChristian Amado10-Aug-12 8:42 

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