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Note
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This practice uses standard ADO.NET programming to connect to data. You will see how you can use LINQ to SQL and the Entity Framework in later chapters. You will also see how you can replace your SQL queries with Language-Integrated Query (LINQ) queries.
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E xErcIsE 1 Creating an ASP.NET XML Web Service
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In this exercise, you create the XML web service website and define the web service.
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1. 2. 3.
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Open Visual Studio and create a new ASP.NET website by using either C# or Visual Basic. Name the project Pubsservices. Add the pubs.mdf file to the App_Data directory of the web service application. The database file is provided in the samples installed from this book s companion CD. Add a new service file called Authors.asmx to your site by right-clicking the project and choosing Add New Item. Select the Web Service template from the Add New Item dialog box.
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Lesson 2: Creating and Consuming XML Web Services
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ChAPTER 10
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The class file for Authors.asmx should open in the code editor. If it does not, open it from the App_Code directory. Delete the HelloWorld web method in the service file template. There is no need to inherit from the WebService class, because this service does not use the features of ASP.NET. Therefore, remove this inheritance from the class definition. Edit the WebServiceAttribute class and set a default namespace. Your class definition should look similar to the following.
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Sample of Visual Basic Code <WebService(Namespace:="http://mydomain.org/")> _ <WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _ Public Class Authors Inherits System.Web.Services.WebService End Class Sample of C# Code [WebService(Namespace = "http://mydomain.com/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class Authors { public Authors () { } }
Open the Web.config file. Find the <connectionStrings /> element. Add markup to define a connection to the pubs.mdf database. The following shows an example.
<connectionStrings> <add name="PubsConnectionString" connectionString="Data Source=.\ SQLEXPRESS;AttachDbFilename=|DataDirectory|\pubs.mdf; Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/> </connectionStrings>
8. 9.
Return to the Authors.cs class file. Add using (Imports in Visual Basic) statements to the class file for System.Data, System.Data.SqlClient, and System.Configuration. Add a private variable at the class level to store the connection string to the Pubs database. Name this variable _cnnString, as shown in the following code.
Sample of Visual Basic Code Private _cnnString As String = _ ConfigurationManager.ConnectionStrings("PubsConnectionString").ToString Sample of C# Code private string _cnnString = ConfigurationManager.ConnectionStrings["PubsConnectionString"].ToString();
588 ChAPTER 10
Writing and Working with HTTP Modules and Web Services
Add a method to the class to return all titles for a specified author based on the authorId. These titles can be returned as a DataTable instance. Name this method GetAuthorTitles. Tag the GetAuthorTitles method with the WebMethodAttribute class. Set the CacheDuration to 300 seconds. Your method should look as follows.
Sample of Visual Basic Code <WebMethod(CacheDuration:=300)> _ Public Function GetAuthorTitles(ByVal authorId As String) As DataTable Dim sql As StringBuilder = New StringBuilder() sql.Append("SELECT titles.title, titles.type, titles.price, ") sql.Append("titles.pubdate FROM titleauthor INNER JOIN titles ON ") sql.Append("titleauthor.title_id = titles.title_id ") If authorId <> "0" Then sql.Append("WHERE (titleauthor.au_id = @AuthorId) ") Dim cnn As New SqlConnection(_cnnString) Dim cmd As New SqlCommand(sql.ToString(), cnn) cmd.Parameters.Add("AuthorId", SqlDbType.VarChar, 11).Value = authorId Dim adp As New SqlDataAdapter(cmd) Dim ds As New DataSet() adp.Fill(ds) Return ds.Tables(0) End Function Sample of C# Code [WebMethod(CacheDuration = 300)] public DataTable GetAuthorTitles(string authorId) { StringBuilder sql = new StringBuilder(); sql.Append("SELECT titles.title, titles.type, titles.price, "); sql.Append("titles.pubdate FROM titleauthor INNER JOIN titles ON "); sql.Append("titleauthor.title_id = titles.title_id "); if (authorId != "0") sql.Append("WHERE (titleauthor.au_id = @AuthorId) "); SqlConnection cnn = new SqlConnection(_cnnString); SqlCommand cmd = new SqlCommand(sql.ToString(), cnn); cmd.Parameters.Add("AuthorId", SqlDbType.VarChar, 11).Value = authorId; SqlDataAdapter adp = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); adp.Fill(ds); return ds.Tables[0]; }
Lesson 2: Creating and Consuming XML Web Services
ChAPTER 10
Compile your application and make sure there are no errors. Right-click the Authors.asmx file and choose Set As Start Page. Run your application and use the host generated by ASP.NET to test your application. You can select an author ID from the Pubs database for testing, or you can pass the value zero (0) to return all titles. You should see the results in XML.
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