By Bayer White
In professional WF 4.5, you can find the perception and course for figuring out easy methods to construct workflows utilizing WF 4.5 and host them as long-running providers utilizing Microsoft’s home windows Server, for on-premises paintings, and Azure AppFabric, for website hosting workflows within the cloud. With the concept that of cloud computing utilizing home windows Azure and the adulthood of home windows Server know-how, workflow prone might be hosted with first class provider tracking with much less overhead from a developer’s viewpoint. construction workflows in a declarative style, and website hosting them as prone, is a common method for construction company good judgment that's tiered clear of operating purposes that sign up for them, hence offering flexibility for whilst company techniques switch. In professional WF 4.5, writer Bayer White walks you, because the developer, throughout the steps and explains the ideas of declaratively modeling area particular company procedures that may be hosted and uncovered as prone, both on premise or as cloud prone inside home windows Azure. offers a realistic wisdom of WF 4.5, home windows Server and Azure AppFabric. Builds a starting place for construction workflows that may be uncovered on-premise or within the cloud. indicates easy methods to use the instruments to be had for handling workflow companies. What you’ll study comprehend the alterations brought in home windows Workflow beginning after WF 4.0 construct workflows by means of realizing what instruments can be found to allow them to be hosted as prone notice what website hosting ideas can be found with AppFabric and the way to figure out which one to take advantage of. know the way to put in and configure home windows Server and home windows Azure AppFabric. installation workflows as providers utilizing home windows Server and home windows Azure AppFabric. be certain present overall healthiness of working companies by way of figuring out what instruments can be found for tracking. Who this ebook is for seasoned WF 4.5 is for builders and designers drawn to development fit long-running companies both on-premise or within the cloud. desk of Contents Why Workflows? Introducing home windows Workflow beginning Workflow actions country laptop Workflows Flowchart Workflows Dynamically altering and Versioning Workflows styles for webhosting Workflows Persisting Workflows monitoring Workflows Re-hosting the Workflow clothier Stateful WCF prone utilizing Workflows Workflows in Azure Workflows in Windows Server AppFabric
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5, and the majority of the features came from customer requests around WF and building state-machine workflows. Building state-machine workflows was a functionality that the WF team omitted with the release of WF4 because they figured state-machine workflows were no longer needed with the release of flowchart-style workflows. NET Framework 4 Platform Update 1 (KB2478063), which loads the runtime files for the platform update. • Multi-Targeting Pack (KB2495638, which loads reference assemblies and IntelliSense files for the platform update.
WF provides a framework (which would otherwise have to be custom built) to address common design goals and characteristics associated with implementing long-running processes. WF functionality includes memory management for persisting the current state or snapshot of a process and tracking custom events for the duration of a process. B. 5 © Bayer White 2013 21 CHAPTER 2 ■ INTRODUCING WINDOWS WORKFLOW FOUNDATION Sometimes the complexity of business rules for processes within organizations can be difficult to comprehend, which leads to a huge effort in implementing complicated logic within software.
Figure 2-5. Simple WriteLine activity for displaying text DoWhile Activity This activity models the code statement DoWhile and has a Condition property that must use an expression resulting in either a True or False value. Expressions used in WF4 must be VB expressions, so instead of using a C# expression like 1==1, a VB expression expressed as 1=1 is required. Figure 2-6 illustrates a DoWhile activity that uses 30 CHAPTER 2 ■ INTRODUCING WINDOWS WORKFLOW FOUNDATION the C# expression 1==1. While the Condition property of the DoWhile activity is met, the WriteLine activity that is contained within the DoWhile activity will write “Execute Me” to the console window as an infinite loop because 1==1 will always result in True.