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Implementing Web Methods
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Within each web service, you add web methods. If a web service is thought of as a class (which it technically is), then a web method is akin to marking a method as public on a class, making it available externally. For our application, we ll create the Partners.asmx service and add web methods called GetAttendees() and GetContactRequests(), which actually implement the functionality we re trying to expose. Although the way in which these methods are called depends on the format used HTTP-GET, HTTP-POST, and so on the methods are always accessed from the containing service URL.
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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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Try it Out: Create a Web Service You will now add a web service to your Friends Reunion project. Note, however, that you could instead create a completely separate application for this purpose. Doing so would allow for some more independent control over authentication, permissions, and so on. In our example, building a separate web service application isn t necessary. 1. Add a new folder to the application, called Services. This will allow you to set different authentication and authorization policies than the ones in effect for the main site. 2. Right-click the folder, select Add Add Web Service, and name the new item Partners.asmx, as shown in Figure 9-2.
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Figure 9-2. Creating a new Web Service 3. Next, you need to create SqlConnection and SqlCommand components to interact with the database. To do this, return to the new Partners.asmx file, in the Design view. In this view, you ll be able to drag-and-drop the database components that you need onto the design surface, just as you have done in earlier chapters. 4. From the Data tab of the Toolbox, drag-and-drop a SqlConnection component onto the design surface. Set the Name property of this to cnFriends and select the ConnectionString property from the DynamicProperties section, mapping it to the suggested default key of cnFriends.ConnectionString that we have been using since 4. 5. Once the connection has been created, drag-and-drop a SqlCommand component onto the design surface, and rename it to cmAttendeesCount. Next, set the Connection property to the existing connection, cnFriends. Set the CommandText required to retrieve the count of unique users for the requesting place in the TimeLapse table to the following SQL query:
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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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SELECT COUNT(0) AS Attendees, @PlaceID FROM (SELECT UserID FROM TimeLapse WHERE PlaceID = @PlaceID GROUP BY UserID) Users If you set it directly in the Properties browser, enter the query without line breaks. Accept the suggestion to regenerate command parameters. You need to place the @PlaceID parameter in the outside query in order to get the appropriate command parameter to be generated and added automatically. 6. Switch to the code-behind view to start developing your web methods. The codebehind view should present you with a fairly standard looking class. We ll look at the differences between this and other classes shortly, but for now, you can just get on with adding a web method of your own. 7. The first method you ll create is called GetAttendees(). This will take a place ID and return the count of unique users who either worked there or attended classes. To create this method, enter the following code into the class: <WebMethod()> _ Public Function GetAttendees(ByVal placeId As String) As Integer cnFriends.Open() Try ' Set the place to filter by cmAttendeesCount.Parameters("@PlaceID").Value = placeId Return CType(cmAttendeesCount.ExecuteScalar(), Integer) Finally cnFriends.Close() End Try End Function
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When the web service was originally created, the IDE would have placed a short HelloWorld() web Tip
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method example in it for you to see how the functionality works. This is a sample web service that simply returns the string Hello World to anyone who calls it. It is provided as a template for the creation of your own web services and as a means for testing. We won t be showing you how to get it running here, as all you need to know is explained in the method s comments, so you can delete it without causing any concerns. If you leave it there, it can always be uncommented and run to help you diagnose any problems you may encounter.
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8. In order to make the services publicly available, you must allow Anonymous access to them. To do this, add the following location element to the Web.config file, just as you did back in 3 for the NewUser.aspx page. This time, however, you simply specify the folder. Remember this element must be under the root <configuration> element.
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