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There will likely come a time where you need to change how page.tpl.php, node.tpl.php, or any of the other standard template files display elements on your site. Let s step back to our Grayscale theme that we created at the beginning of the chapter and customize the page.tpl.php file so that when a visitor is on the front page of the site, a welcome message is displayed. If the visitor isn t on the front page, we won t display the welcome message. To begin the process, copy the page.tpl.php file from the modules/system directory into the sites/all/themes/grayscale/templates directory. By copying the file into our theme s directory, Drupal will now use that version of page.tpl.php rather than the one in the modules/system directory. The modification that we ll make is relatively simple. We ll use the $is_front variable that is exposed to the page template, and using a conditional phrase, check to see if the visitor is on the front page. If so, we will display a Welcome to My Site message at the top of the page. Open the file and look for the following line: <div id="content" class="column"><div class="section"> Immediately after that line, insert the following line of code, which uses the $is_front variable to see if the visitor is on the front page of your site, and if so, prints out a welcome message. < php if ($is_front): ><div id="welcome_message"> < php print "Welcome to My Site!"; ></div> < php endif; > The result is that Welcome to My Site! is printed right under the secondary menu. It is nothing spectacular, but it demonstrates the concept of leveraging the standard page.tpl.php file and customizing.

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).

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.

Note If your custom page.tpl.php file doesn t appear to be working, remember to visit admin/config/development/performance and clear your site s cache.

You ll want to use WorkflowApplication (as opposed to WorkflowInvoker) if you need to save or load a long running workflow using WF persistence services, be notified of various events which fire during the lifetime of your workflow instance, work with WF bookmarks, and other advanced features. If you have a background in the previous version of the WF API, use of WorkflowApplication will look familiar to using the .NET 3.5 WF WorkflowRuntime class, in that you will need to call the Run() method to start the workflow instance. When you do call Run(), a new background thread will be plucked from the CLR thread pool. Therefore, if you do not add additional support to ensure the main thread waits for the secondary thread to complete, the workflow instance may not have a chance to finish its work!