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11: Deploying Web Services with WCF
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With the user account set up for the database, update the appconfig file of the service to use the credentials of that user account, like this For best security, please remember to change the password:
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<add name= "WcfDemoCSPropertiesSettingsMyShopConnectionString" connectionString= "Data Source=\sqlexpress;Initial Catalog=MyShop; User ID=MyUserAccount;Password=G7b@H8m2a%lM6y;Pooling=False" providerName="SystemDataSqlClient" />
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To deploy, right-click the Web Services project, WcfDemo, and click Publish, which will display the Publish WCF Service window shown in Figure 11-10 In the Publish WCF Service window, set the Target Location to the address where the WCF Service is deployed You saw how to figure out the address earlier in this section You can choose to either replace only matching files or delete all files in the deployment location You normally only want to copy files needed to run this application because the deployment will be quicker with fewer files and possibly more secure by only deploying what is necessary The check box for Include Files From The App_Data Folder is disabled because there isn t an App_Data folder in the WCF Service project However, this same tool is used to deploy an ASPNET Web site, which might have an App_Data folder
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Figure 11-10
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The Publish WCF Service window
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Microsoft Visual Studio 2010: A Beginner s Guide
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Normally, you don t want to deploy the App_Data folder because it might hold a database file that is huge and would slow down your application considerably Of course, if you have SQL Server Express installed at the deployment location and need the database in App_Data to be deployed, check this box to include the database in the deployment Click Publish to deploy your service When deployment is complete, you ll see a message on the VS status bar stating either Publish Succeeded or Publish Failed If publishing fails, open the Output window, CTRL-W, O, to see the reason why There are many reasons a deployment can fail, so look at the error message to see if it s something that makes sense to you Verify that your Web site is properly set up, as explained in the preceding section Other sources of information include the Microsoft Developer Network (MSDN), at http://msdnmicrosoftcom, where you can search for Knowledge Base support articles Alternatively, you can copy the error message and paste it into your favorite search engine Many problems with deployment surround IIS setup, so it is worthwhile to learn more about how IIS works McGraw-Hill offers Windows Server 2008: A Beginner s Guide, by Marty Matthews (2008), which does include IIS 7 information There s also a Windows Server 2003 edition if you are deploying to IIS 6 Now that you know how to develop and deploy a WCF service, you ll need to know how to write programs that use that service, which is covered next
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Any NET application can communicate with a Web service In fact, one of the benefits of having a Web service is to expose functionality that can be used by multiple applications In theory, any application on any platform can communicate via Web services because the underlying technology relies on open standards, such as HTTP and XML In practice, the goal of cross-platform communication is an advanced technique accomplished by architects and engineers with detailed knowledge of the inner workings of Web services For just getting started, it s sufficient to know that you can communicate with Web services with any NET technology The following sections show you how to make your applications, clients, communicate with Web services Let s look at the task of generally creating a reference to a Web service first
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Creating a Service Reference
Regardless of what type of application you re building, you create a reference to a Web service, called a service reference, in the same way You start off with a project, any project type Console, WPF, ASPNET, or Silverlight will do Right-click the project
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