6: Retrieving Data from External Source s in .NET

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Creating a Simple Web Service Using Visual Studio 2005 To follow along with the text and create a Web service in Visual Studio 2005, your computer must meet the following prerequisites:
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Visual C# 2005 Visual Web Developer 2005 Internet Information Services (IIS) 60 or later with ASPNET enabled (that comes with NET Framework 20) FrontPage 2002 Server Extensions (installable through the Add/Remove Windows Components button) We ll start with creating a new Web site in the Visual Studio Start page This is the default page that appears when Visual Studio 2005 is opened (Note that this is con gurable, so your results may vary) Click on the Web site link adjacent to the Create label, which is located in the Recent Projects (upper-left) region The New Web Site dialog appears with a list of templates (Figure 623) We want to choose the ASPNET Web Service template For this example,
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Figure 623: New Web Site dialog with a template for an ASPNET Web service
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Web Ser vice s
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we re assuming that the Web server is on the same machine as Visual Studio; thus, we ll create our Web service via HTTP directly to http://localhost/ InfoPathWebService This address is not the address of the Web service, however It is simply the Web site that will be created for the Web service This will become clear when we eventually use the Web service After you click the OK button, it will take a few moments to create the site If a prompt appears about ASPNET not being installed, Visual Studio will offer to install it for you Once the site is created, Visual Studio opens the Servicecs le, which shows the code that de nes the Web service A single method called HelloWorld already exists, courtesy of the ASPNET Web service template we selected Feel free to experiment with HelloWorld before continuing with the next step Let s add our own Web service method We will eventually design a form against this Web service to see how it works in InfoPath Below the HelloWorld method, we ll want to add our own code The C# code snippet in Listing 61 includes the HelloWorld method to show the relative placement of the new methods The code in Listing 61 adds a class-wide private variable and three public methods below HelloWorld: FilePath, GetSavedItems, SaveItem, and SaveItems, respectively Collectively, this new code enables the Web service to get and set data for a speci c le on the server Since a Web service is intrinsically stateless, meaning that it does not remember the data you sent after it nishes executing, this code creates a very rudimentary storage system Table 62 contains a summary of each method and what it does
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Sample Code Is Not Production-Ready
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The code we added in this Web service is potentially dangerous from a security standpoint and should never be used in production In production code, we would want to restrict access to the Web service through IIS, check all input parameters, and limit the le size and amount of data that can be sent to our Save methods Our code serves only as an example to help you understand Web services and how InfoPath works with them
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Listing 61: Writing Code for the Web Service Sample
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[WebMethod] public string HelloWorld() { return "Hello World"; } private string FilePath = SystemIOPathCombine( EnvironmentGetEnvironmentVariable("TEMP"), "SavedItemstxt"); [WebMethod] public string[] GetSavedItems() { using (SystemIOStreamReader reader = new SystemIOStreamReader(FilePath)) { string leData = readerReadToEnd(); return leDataSplit('\n'); } } [WebMethod] public void SaveItem(string item) { SaveItems(new string[] { item }); } [WebMethod] public void SaveItems(string[] items) { using (SystemIOStreamWriter writer = new SystemIOStreamWriter(FilePath)) { foreach (string item in items) { writerWriteLine(item); } } }
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You might be wondering how this code creates, or shapes, the Web service Each public method with the [WebMethod] attribute above the de nition is directly exposed via the Web service The GetSavedItems method, for example, is called with no parameters and returns an array of strings On the other hand, the SaveItems method accepts an array of strings but returns nothing We will not spend more time reviewing the sample Web service code since Table 62 dissects and explains its parts If you are not familiar with C#,
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