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developing mashup-style applications, where an interim server is not necessary to consume the web service and provide the data in HTML format, as is the typical design pattern when using web services. In this section, you ll build a web service, make it accessible to JavaScript, and build a simple client that accesses it. For this example, you will build a web service that fronts the AdventureWorks database and uses its country code lookup table to allow you to convert a country code into a country name. For example, WS evaluates to Samoa and GL to Greenland. You can see this data in the Person.CountryRegion table. If you haven t already set up an AdventureWorks database and connection to it in your application, it s a good idea to work through s 4 and 5 and the samples earlier in this chapter before continuing. You can still use this sample, but if you have connectivity trouble (i.e., reading the connection string from Web.config), go through those earlier samples and you should be fine. To get started, add a new ASMX web service to your solution and call it DataService. asmx. The full code for this service is listed following. This implements the simple web method GetCountryForRegion, taking in the region code and returning the country that matches it.

list.add(item); } session.setAttribute("ToDoList", list, PortletSession.APPLICATION_SCOPE); } protected void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException { response.setContentType("text/html"); PortletContext portletContext = getPortletContext(); PortletRequestDispatcher prd = portletContext.getRequestDispatcher("/WEB-INF/jsp/homePage.jsp"); prd.include(request, response); } protected void doEdit(RenderRequest request, RenderResponse response) throws PortletException, IOException { response.setContentType("text/html"); String display = request.getParameter("DISPLAY"); PortletContext portletContext = getPortletContext(); if ("EDIT_PAGE".equals(display)) { PortletRequestDispatcher prd = portletContext.getRequestDispatcher( "/WEB-INF/jsp/editItemPage.jsp"); prd.include(request, response); } else { PortletRequestDispatcher prd = portletContext.getRequestDispatcher("/WEB-INF/jsp/editPage.jsp"); prd.include(request, response); } } protected void doHelp(RenderRequest request, RenderResponse response) throws PortletException, IOException {

The schema needs to define a simple type for names. This is defined next: XmlSchemaSimpleType nametype = new XmlSchemaSimpleType(); XmlSchemaSimpleTypeRestriction nameRes = new XmlSchemaSimpleTypeRestriction(); nameRes.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema"); XmlSchemaMinLengthFacet nameFacet1 = new XmlSchemaMinLengthFacet(); nameFacet1.Value = "3"; XmlSchemaMaxLengthFacet nameFacet2 = new XmlSchemaMaxLengthFacet(); nameFacet2.Value = "255"; nameRes.Facets.Add(nameFacet1); nameRes.Facets.Add(nameFacet2); nametype.Content = nameRes; A simple type is represented by the XmlSchemaSimpleType class. The simple type for names has certain restrictions: The data type must be a string. The minimum length must be 3. The maximum length must not exceed 255. To represent these restrictions, an instance of the XmlSchemaSimpleTypeRestriction class is created. The XmlSchemaSimpleTypeRestriction class s BaseTypeName property, which is of type XmlQualifiedName, specifies the base data type used by this restriction. The XmlQualifiedName class can be used to represent built-in XSD data types such as string and int. In our example, we need string and hence we pass it as the first parameter of the constructor. The second parameter indicates the namespace to which the data type belongs. The minimum and maximum length restrictions can be enforced by facet classes. The two facet classes we need are XmlSchemaMinLengthFacet and XmlSchemaMaxLengthFacet. These facet classes inherit from the XmlSchemaFacet base class and represent the minimum length and maximum length of the simple type, respectively, indicated by the Value property of each class. The facets are then added to the XmlSchemaSimpleTypeRestriction instance by using its Add() method. Finally, the Content property of the XmlSchemaSimpleType object is set to the restriction we created.

using using using using using using using using System; System.Web; System.Collections; System.Web.Services; System.Web.Services.Protocols; System.Data; System.Data.SqlClient; System.Web.Configuration;

5

Creating a simple type for phone numbers follows the same procedure as discussed earlier. However, the restriction requirements are slightly different. The relevant code is shown here: XmlSchemaSimpleType phonetype = new XmlSchemaSimpleType(); XmlSchemaSimpleTypeRestriction phoneRes = new XmlSchemaSimpleTypeRestriction(); phoneRes.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema"); XmlSchemaMaxLengthFacet phoneFacet1 = new XmlSchemaMaxLengthFacet(); phoneFacet1.Value = "20"; phoneRes.Facets.Add(phoneFacet1); phonetype.Content = phoneRes;

response.setContentType("text/html"); Writer writer = response.getWriter(); PortletContext portletContext = getPortletContext(); PortletRequestDispatcher prd = portletContext.getRequestDispatcher("/WEB-INF/jsp/helpPage.jsp"); prd.include(request, response); } }

[WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class DataService : System.Web.Services.WebService { public DataService () { //Uncomment the following line if using designed components //InitializeComponent(); } [WebMethod] public string GetCountryForRegion(string strRegion) { string strReturn = "";

Summary

As before, instances of XmlSchemaSimpleType and XmlSchemaSimpleTypeRestriction are created. This time we need only one facet for specifying the maximum length of the phone number. Thus the code declares an instance of XmlSchemaMaxLengthFacet class and sets its Value property to 20. As before, the facet is added to the restriction, and the Content property of the XmlSchemaSimpleType instance is set to the phone number restriction.