A Web Service in a Visual Studio 2010 project as displayed in the Solution Explorer in VS .NET

Maker QR Code JIS X 0510 in VS .NET A Web Service in a Visual Studio 2010 project as displayed in the Solution Explorer

A Web Service in a Visual Studio 2010 project as displayed in the Solution Explorer
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Communicating with the Outside World
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The sample Customers database diagram
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The code in this sample Web Service contains two web methods at this point The first web method returns a single Customer object and will be used to display a single customer The single customer to be returned will be determined based on a customer ID supplied as an input parameter to the web method The second web method will return a generic list of Customer objects and will be used to display a list of customers Each web method will retrieve customer information from the database by calling a stored procedure The code for the stored procedures is shown in the following listing:
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/* this stored procedure returns all customer profiles */ create procedure dboGetCustomers as begin set nocount on -- retrieve customers select CustomerId, FirstName, LastName, Address, City, State,
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ZipCode, EmailAddress, Phone, Notes from Customers end
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/* this stored procedure returns a single customer profile based on a supplied id */ CREATE procedure dboGetCustomerById @customerId as int as begin set nocount on -- retrieve customers select CustomerId, FirstName, LastName, Address, City, State, ZipCode, EmailAddress, Phone, Notes from Customers where CustomerId = @customerId end
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In order for a class to be able to be serialized, transported over the Web, and then deserialized, the class must contain a default constructor and must be marked up by using the [Serializable] attribute The following listing shows the code for the Customer class:
using System; [Serializable] public class Customer { // default properties public int CustomerId { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public string Address { get; set; } public string City { get; set; } public string State { get; set; } public string ZipCode { get; set; } public string EmailAddress { get; set; } public string Phone { get; set; } public string Notes { get; set; } public Customer(){} }
In a typical client/server environment, a business facade class, such as the Customer class, would include methods for inserting new customers, updating existing customers, deleting customers, and selecting customers However, in order to design the class and Web Service correctly for a Silverlight application, the Customer class will simply contain customer data, and the methods used to manage customer data will be parsed out and added to the Web Service itself The Web Service is shown in the next code listing and includes two web methods for retrieving all customers and a single customer by using the customer ID In a real-world example, the Web Service would be more robust and include web methods to insert, update, and delete customers as well The following code utilizes simple ADONET to call the stored procedures and handle the data Code that accesses data may also utilize Language Integrated Query (LINQ) or the new ADONET Entity Framework (more specific data-access code will be covered in a later chapter)
using using using using using System; SystemCollections; SystemCollectionsGeneric; SystemWeb; SystemWebServices;
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using using using using SystemWebServicesProtocols; SystemData; SystemDataSqlClient; SystemConfiguration;
[WebService(Namespace = "http://tempuriorg/")] [WebServiceBinding(ConformsTo = WsiProfilesBasicProfile1_1)] public class CustomerManager : SystemWebServicesWebService { // create a connection to the database SqlConnection cn = new SqlConnection(ConfigurationManager ConnectionStrings["customerDB"]ConnectionString); public CustomerManager() { //Uncomment the following line if using designed components //InitializeComponent(); } [WebMethod] public List<Customer> GetCustomers() { // create a new list for storing customers List<Customer> customers = new List<Customer>(); try { // open the connection cnOpen(); // process the stored procedure using (SqlCommand cmd = new SqlCommand("GetCustomers", cn)) { cmdCommandType = CommandTypeStoredProcedure; // execute the command and store the results into a // datareader SqlDataReader rdr = cmdExecuteReader(); // were any rows returned if (rdrHasRows)
6:
Communicating with the Outside World
Customer customer; while (rdrRead()) { customer = new Customer(); customerCustomerId = intParse(rdr["CustomerId"]ToString()); customerFirstName = rdr["FirstName"] ToString(); customerLastName = rdr["LastName"] ToString(); customerAddress = rdr["Address"]ToString(); customerCity = rdr["City"]ToString(); customerState = rdr["State"]ToString(); customerZipCode = rdr["ZipCode"]ToString(); customerEmailAddress = rdr["EmailAddress"] ToString(); customerPhone = rdr["Phone"]ToString(); customerNotes = rdr["Notes"]ToString(); customersAdd(customer); } } } return customers; } catch (Exception ex) { return customers; } finally { cnClose(); cnDispose(); cn = null; } } [WebMethod] public Customer GetCustomerById(int customerId) { // create a new customer Customer customer = new Customer(); try
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