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Web Services I: Returning Data in XML Format. Service-Oriented Architecture (SOA). Old Model for Applications Executables running on individual computers Limited or no ability to communicate between applications Very dependent on platform, OS and/or programming language SOA

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Web services i returning data in xml format

Web Services I: Returning Data in XML Format


Service oriented architecture soa
Service-Oriented Architecture (SOA)

  • Old Model for Applications

    • Executables running on individual computers

    • Limited or no ability to communicate between applications

    • Very dependent on platform, OS and/or programming language

  • SOA

    • Loosely coupled “Services”

      • Currently – Web Services

    • Can be called from multiple platforms, OS’s and languages



Web service
Web Service

  • A class with methods that can be accessed (via the Internet):

    • From different platforms (Hardware and OS)

    • By different programming languages

  • Information is returned from the Web Service in an XML format or JSON format


I creating a hello world web service with vs 2010
I. Creating a "Hello World" Web Service with VS 2010

  • Within a Visual Studio 2010 Website

  • Website, Add New Item, Web Service

    • This will create a class with all of the unique web service stuff already in it – including a “Hello World” test method.

    • The web service by default will have two files (just like our web pages):

      • .asmx file (WebService.asmx)

        • This is what you point the users of the service at

        • It contains a link to the .cs file (below)

      • .cs class file (WebService.cs)

        • Lives in the App_Code folder

  • Browse .asxm file to test the Web Service


Hello world part 2
"Hello World" part 2

  • Here is the code in the WebService.asmx file

<%@ WebServiceLanguage="C#"CodeBehind="~/App_Code/WebService.cs"Class="WebService" %>

This is the file that is browsed,

It is essentially just a front-end to the .cs file behind it.


Hello world part 3
"Hello World" part 3

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the //following line.

// [System.Web.Script.Services.ScriptService]

public classWebService : System.Web.Services.WebService {

public WebService () {

//Uncomment the following line if using designed components

//InitializeComponent();

}

[WebMethod]

public stringHelloWorld() {

return "Hello World";

}

}

  • Here is the code in the WebService.cs file


I providing a web service cont adding methods
I. Providing a Web Service cont: Adding Methods

  • Adding a method to a Web Service is identical to what you’re used to, except:

    • [WebMethod] attribute must be immediately before the public keyword in the method declaration

[WebMethod]public decimal CalculateYearlyBonus(decimal parYearlySales){

}


Ws musiccategories
WS_MusicCategories

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

// To allow this Web Service to be called from script, using ASP.NET //AJAX, uncomment the following line.

// [System.Web.Script.Services.ScriptService]

public classWebService : System.Web.Services.WebService {

publicWS_MusicCategories () {

//Uncomment the following line if using designed components

//InitializeComponent();

}

[WebMethod]

public List<TO_MusicCategory>GetCategories() {

DA_MusicCategoriescategoriesObject = new DA_MusicCategories();

returncategoriesObject.GetCategories()";

}

}


Ws musiccategories cont
WS_MusicCategories cont.

  • From the preceding slide, note the following:

    • The [ScriptService] line is uncommented

    • All the GetCategories web service method does is:

      • Create an instance of your DA_MusicCategories class

      • Calls the DA class method GetCategories

      • Returns the result of that call

    • The Web Service is just a wrapper around your original DA class that allows it to be used as a web service.