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Windows Workflow provides the following functionality out of the box: A visual method of constructing your applications similar to our flowchart in Figure 6-1. This visual approach is more intuitive, can be easier to debug , is easier to unit test with changes in this release (a controversial idea, but discussed in the following sections), and can be understood by non-technical users. Of course developing an application entirely in code has its advantages as well it is generally easier to test, and developers won t have to learn new ways of writing applications. More efficient use of server resources. Non-active workflows sleep and are rehydrated when needed. Coordination and synchronization. Workflows that make calls to external services may take weeks to receive a reply. By using correlation, we can ensure returned calls are automatically directed to the correct instance of a work flow that can then wake up and resume its work Workflow state can be persisted even during system down time and resumed automatically. Ability to host the workflow designer within your applications for customization and configuration by end users. Rich debugging and monitoring support. A common framework for workflow development on the Windows platform. WF is already utilized in flagship products such as Microsoft Sharepoint and Dynamics (note these use WF3 at time of writing). You can even host your workflows in Microsofts cloud computing platform Windows Azure (at the time of writing this is not available, but should be in the future). WF can assist you with versioning and updating issues (although for the forseeable future this is never going to be that easy).

Note The Font Size setting (system dpi) is different from the monitor resolution. If you set the monitor to a

Diagnostic directives produce user-defined compile-time warning and error messages. The following is the syntax of the diagnostic directives. The messages are strings, but notice that unlike normal C# strings, they do not have to be enclosed in quotation marks. #warning Message #error Message When the compiler reaches a diagnostic directive, it writes out the associated message. The diagnostic directive messages are listed by the compiler along with any compiler-generated warning and error messages. For example, the following code shows an #error directive and a #warning directive. The #error directive is inside an #if construct so that it will be generated only if the conditions on the #if directive are met. The #warning directive is a reminder to the programmer to come back and clean up a section of code.

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Hopefully I have convinced you that Workflow is something that you should be interested in. Let s take a closer look.

#define RightHanded #define LeftHanded #if RightHanded && LeftHanded #error Can't build for both RightHanded and LeftHanded #endif #warning Remember to come back and clean up this code!

higher resolution setting, then everything will shrink proportionately. This is independent from the Font Size dpi.

Windows Workflow Foundation is composed of 3 main components: Workflow instance/runtime Activities Workflow designer

Line number directives can do several things, including the following: Change the apparent line numbers reported by the compiler s warning and error messages Change the apparent file name of the source file being compiled Hide a sequence of lines from the interactive debugger The syntax for the #line directives is the following: #line integer #line "filename" #line default #line hidden #line // Sets line number of next line to value of integer // Sets the apparent filename // Restores real line number and filename // Hides the following code from stepping debugger // Stops hiding from debugger

XAML Browser Applications (XBAPs)

The Workflow runtime takes care of instantiating individual workflows and handles persistence and synchronization. The workflow runtime does not exist on its own. It is created inside a host application. The host application can be anything from an ASP.NET website to a windows service or even the new Dublin or Windows Azure platforms. In previous versions of WF the WorkflowRuntime class was restricted to one WorkflowRuntime per app domain and WorkflowInstance instantiated individual workflows. WorkflowInstance has now been replaced with the class WorkflowInstance, which represents an individual workflow. This change makes it much easier to attach event handlers and delegates to individual workflows, but also arguably complicates tasks such as recording errors as they now have to be dealt with on an individual workflow basis.

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