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After all, you could have avoided Windows Workflow Foundation all together and simply built the following C# class: class Program { static void Main(string[] args) { try { ExecuteBusinessProcess(); } catch (Exception ex) { Console.WriteLine(ex.Message); Console.WriteLine(ex.Data["Reason"]); } } private static void ExecuteBusinessProcess() { string UserName = "Andrew"; Console.WriteLine("Hello {0}", UserName); Console.WriteLine("Do you want me to list all machine drives "); string YesOrNo = Console.ReadLine(); if (YesOrNo.ToUpper() == "Y") { Console.WriteLine("Wonderful!"); string[] DriveNames = Environment.GetLogicalDrives(); foreach (string item in DriveNames) { Console.WriteLine(item); } Console.WriteLine("Thanks for using this workflow"); } else { Console.WriteLine("K, Bye..."); Exception ex = new Exception("User Said No!"); ex.Data["Reason"] = "YesOrNo was false"; } } } The output of the program would be absolutely identical to the previous XAML based workflow. So, why bother tinkering with all these activities in the first place First of all, remember that not everyone is comfortable reading C# code. Be honest: If you had to explain this business process to a room full of sales people and non-technical managers, would you rather try to explain this C# code or show them the flowchart I know my answer...

At the end of the report script, the last four lines are read as a single line, using line continuation. A backslash at the end of a line tells the shell to ignore the newline character, effectively joining the next line to the current one.

More importantly, remember that the WF API has a whole slew of additional runtime services, including persistence of long running workflows to a database, automatic tracking of workflow events, and so on (alas, I don t have time to cover them here). When you think of the amount of work you would need to do in order to replicate this functionality in a new project, the utility of WF is even clearer. Finally, by allowing us a declarative way to generate workflows using designers and XAML, we can offload the construction of a workflow to higher level subject matter experts and managers, while we incorporate the XAML into our C# projects. All of this being said, the WF API is not necessarily the correct tool of choice for all .NET programs. However, for most traditional business applications, the ability to define, host, execute and monitor workflows in this manner is a very good thing indeed. Like any new technology, you will need to determine if this is useful for your current project. Let s see another example of working with the WF API, this time by packaging up a workflow in a dedicated *.dll.

name = Breadcrumb Picker description = Provide a character for the breadcrumb trail delimiter. package = Pro Drupal Development core = 7.x The module at sites/all/modules/crumbpicker.module would be tiny: < php /** * @file * Provide a character for the breadcrumb trail delimiter. */ /** * Implements $modulename_preprocess_$hook(). */ function crumbpicker_preprocess_breadcrumb(&$variables) { $variables['breadcrumb_delimiter'] = '/'; } After enabling the module, your breadcrumb trail should look like Home / Administer / Site building. The preceding example illustrates a module setting a variable for a template file to use. But there must be an easier way than creating a module every time a variable needs to be set. Sure enough, it s template.php to the rescue. Let s write a function to set the breadcrumb delimiter. Add the following to your theme s template.php file: /** * Implements $themeenginename_preprocess_$hook(). * Variables we set here will be available to the breadcrumb template file. */ function grayscale_preprocess_breadcrumb(&$variables) { $variables['breadcrumb_delimiter'] = '#'; } That s easier than creating a module, and frankly, the module approach is usually best for existing modules to provide variables to templates; modules are not generally written solely for this purpose. Now, we have a module providing a variable and a function in template.php providing a variable. Which one will actually be used Actually, a whole hierarchy of preprocess functions run in a certain order, each one with the potential to overwrite variables that have been defined by previous preprocess functions. In the preceding example, the breadcrumb delimiter will be # because phptemplate_preprocess_breadcrumb() will be executed after crumbpicker_preprocess_breadcrumb(), and thus its variable assignment will override any previous variable assignment for $breadcrumb_delimiter. For the theming of a breadcrumb trail using the Grayscale theme, the actual order of precedence (from first called to last called) would be: