By K. Scott Allen
A fast paced and functional developer's highway map to operating with home windows WF, from compilation to the bottom job library to runtime providers. home windows Workflow beginning (WF) is a expertise for outlining, executing, and coping with workflows. it truly is a part of the .NET Framework 3.0 and may be to be had natively within the home windows Vista working approach. home windows Workflow origin could be the main major piece of middleware to reach at the home windows platform when you consider that COM+ and the disbursed Transaction Coordinator. the adaptation is, no longer each software wishes a dispensed transaction, yet approximately each software does have a workflow encoded inside of it. during this e-book, okay Scott Allen, writer of well known .NET articles at www.odetocode.com, will give you the entire info had to strengthen winning items with home windows Workflow. From the fundamentals of ways home windows Workflow can remedy the tricky difficulties inherent in workflow ideas, via authoring workflows in code, studying concerning the base job library in home windows Workflow and the differing kinds of workflow supplied, and directly to development event-driven workflows utilizing kingdom machines, workflow communications, and eventually principles and prerequisites in home windows Workflow, this e-book offers you the in-depth details you wish. during the booklet, an instance "bug reporting" workflow process is built, showcasing the expertise and methods used. fast moving and to-the-point, this ebook takes you thru the $64000 issues of home windows WF improvement with transparent reasons and sensible instance code. The book's choice of subject matters is pushed via what the operating developer must comprehend. it really is neither a complete connection with the entire WF structure, nor a method consultant to the total program improvement lifecycle. it really is simply what you as a C# developer want to know to exploit WF on your purposes. This booklet is for .NET builders who are looking to increase their purposes with versatile workflow services utilizing Microsoft home windows Workflow starting place. the writer assumes that you've learn different texts at the total structure of WF and on WF program layout techniques, and as a substitute specializes in real-work implementation concerns for C# builders.
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Additional resources for Programming Windows Workflow Foundation
The SequenceActivity Activities are the basic building blocks in Windows Workflow, and a sequential workflow itself is an activity—a SequentialWorkflowActivity to be precise. The SequentialWorkflowActivity class derives from the SequenceActivity class, which in turn derives from the CompositeActivity class. These superclasses dictate the behavior and characteristics of a sequential workflow. The class diagram as shown on the next page depicts this class hierarchy. Sequential Workflows The CompositeActivty class provides the logic for an activity to contain one or more child activities.
Be wary of the overhead when designing applications that may invoke the Compile method multiple times during their lifetime. • Second, the Compile method will automatically load the new assembly into the current AppDomain if the GenerateInMemory parameter flag is set to true and the compilation is successful. If you don't want the assembly loaded immediately, make sure to set GenerateInMemory to false. We'll be looking at workflow activation later, which is a lightweight alternative to compilation.
To see the XML behind a project file, right-click a project file in Visual Studio and select Unload Project from the context menu. Right-click the project again and select the Edit option. The typical workflow project will contain more XML than the bare minimum we've defined above, but you'll notice all projects created by the workflow templates will have references to the workflow assemblies, and an import of the workflow target definitions. At this point, all we need to do is execute MSBuild and pass the name of our new project file.