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Using providers in a custom web application is fairly easy. The steps for using custom providers are as follows (besides the typical ones such as configuring forms authentication): 1. If you have encapsulated the custom provider in a separate class library (which is definitely useful, as you want to use it in several web applications), you need to add a reference to this class library through the Visual Studio Add References dialog box. 2. Afterward, you must configure the custom provider appropriately in your web.config file. 3. Next you have to select your custom provider as the default provider either through the ASP.NET WAT or through web.config manually. 4. After you have completed these configuration steps, you are ready to use the provider. If you have not added any special functionality and have just implemented the inherited classes straightforwardly as shown in this chapter, you even don t need to change any code in your application. The configuration of the previously created XmlMembershipProvider and XmlRoleProvider looks like this: <membership defaultProvider="XmlMembership"> <providers> <add name="XmlMembership" applicationName="MyTestApp" fileName="C:\Work\MyTestApp_Users.config" type="Apress.ProAspNet.Providers.XmlMembershipProvider, Apress.ProAspNet.Providers" requiresQuestionAndAnswer="true"/> </providers> </membership> <roleManager enabled="true" defaultProvider="XmlRoles"> <providers> <add name="XmlRoles" applicationName="MyTestApp" fileName="C:\Work\MyTestApp_Roles.config" type="Apress.ProAspNet.Providers.XmlRoleProvider, Apress.ProAspNet.Providers" /> </providers> </roleManager> In the previous example, the providers will be configured to use files stored on c:\Work for saving user and role information appropriately. With this configuration, you will find the providers in the ASP .NET WAT (under Providers/Advanced Configuration), as shown in Figure 26-4. Don t try to test the provider; it will fail in this case. Testing providers is just supported for providers that are using database connection strings to connect to the underlying back-end store. Because you are using XML files, testing will not work for the custom provider in this case.

To define the arguments that will capture the incoming dictionary data, you will make use of the workflow designer. In Solution Explorer, right-click Workflow1.xaml and select View Designer. Notice on the bottom of the designer there is a button named Arguments. Click this button now, and from the resulting UI, add an input argument of type String named MessageToShow (no need to assign a default value for this new argument). As well, delete your initial message from the WriteLine activity. Figure 26-5 shows the end result.

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The ASP .NET WAT uses the Membership and Role classes for retrieving and updating data stored through the membership provider. Although we suggest building your own test driver classes by calling all the methods of the membership and Role classes, it is definitely useful to have the possibility of debugging from within the ASP.NET WAT, especially if you experience any problems you did not encounter while testing with your own applications. For debugging through the WAT, you just need to launch the configuration utility through the Website ASP.NET Configuration menu and then attach to the web server process hosting the configuration tool. If you are using the file-based web server for development purposes, launch Visual Studio s Attach to Process dialog box by selecting Debug Attach to Process. Next, find the appropriate web server process. As in most cases, two of these processes will run when using the file-based web server, so you have to attach to the one with the right port number. Match the port number displayed in the address bar of the browser using the ASP.NET WAT with the one displayed in the Attach to Process dialog box. Then your breakpoints in the provider classes will be hit appropriately. Figure 26-5 shows how to attach to the web service process that hosts the ASP.NET WAT.

Figure 26-5. Workflow arguments can be used to receive host supplied arguments Now, in the Text property of the WriteLine activity, you can simply enter MessageToShow as the evaluation expression. As you are typing in this token, you ll notice IntelliSense will kick in (Figure 26-6).

Summary

Now that you have the correct infrastructure in place, consider the following update to the Main() method of the Program class. Note that you will need to import the System.Collections.Generic namespace into your Program.cs file to declare the Dictionary<> variable. static void Main(string[] args) { Console.WriteLine("***** Welcome to this amazing WF application *****"); // Get data from user, to pass to workflow. Console.Write("Please enter the data to pass the workflow: "); string wfData = Console.ReadLine(); // Package up the data as a dictionary. Dictionary<string, object> wfArgs = new Dictionary<string,object>(); wfArgs.Add("MessageToShow", wfData); // Pass to the workflow. WorkflowInvoker.Invoke(new Workflow1(), wfArgs); Console.WriteLine("Thanks for playing"); } Again, it is important to point out that the string values for each member of your Dictionary<> variable will need to be identically named to the related argument variable in your workflow. In any case, you will find output similar to the following when you run the modified program: ***** Welcome to this amazing WF application ***** Please enter the data to pass the workflow: Hello Mr. Workflow! Hello Mr. Workflow! Thanks for playing Press any key to continue . . . Beyond the Invoke() method, the only other really interesting members of WorkflowInvoker would be BeginInvoke() and EndInvoke(), which allow you to start up the workflow on a secondary thread using the .NET asynchronous delegate pattern (see 19). If you require more control over how the WF runtime manipulates your workflow, you can instead make use of the WorkflowApplication class.

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