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Introduction To Windows Workflow Foundation 4.0


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Session conducted in .NET user group

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Introduction To Windows Workflow Foundation 4.0

  1. 1. WHY WORKFLOWS ?• Programming model • Enabling workflow within line-of-business applications • User-interface page flows • Document-centric workflows • Human workflows • Composite workflows for service-oriented applications • Business rule-driven workflows • Workflows for systems management
  2. 2. WHAT IS WORKFLOW ?• A workflow is a set of elemental units • called activities• Activities describes a real-world process• Activity Stores Data using • Variable • Argument • Expression• Describing the order of execution and dependent relationship• Work passes through the model from start to finish
  3. 3. WORKFLOW MODELS Sequential Activity Workflow  start To end  No Go back  One after the other State machine Activity Workflow  Only States  Transitions  when true
  4. 4. ACTIVITY OVERVIEW• Developed as a CLR type • Activity • An abstract base class used to create composite activities • Code Activity • An abstract class for creating a custom activity with imperative behavior defined with the Execute method • Async Code Activity • Abstract Class that manages asynchronous code activity execution from start to completion • Native Activity • An Abstract base class for custom activities that implement execution logic using the Execute method, which has full access to the runtime’s features.
  5. 5. ACTIVITY LIFE CYCLE• Activity Context • Classes that represent the execution environment of an activity• Starts with Executing • Closed • The activity has completed its work and exited • Canceled • The activity has gracefully abandoned its work and exited. Work is not explicitly rolled back when this state is entered • Faulted • The activity has encountered an error and has exited without completing its work
  6. 6. WORK FLOW RUNTIME• is the environment in which workflows execute• Few methods of executing • WorkflowInvoker • which invokes the workflow like a method. • WorkflowApplication • explicit control over the execution of a single workflow instance. • WorkflowServiceHost • message-based interactions in multi-instance scenarios.
  7. 7. WORKFLOW EXECUTIONInvoker MethodWorkflowApplication • Events • Completed • Aborted • Idle
  8. 8. PASSING PARAMETERS - INProperty MethodIDictionary Method
  9. 9. PASSING PARAMETERS - OUTUsing Application Using Invoker
  10. 10. CUSTOM ACTIVITIES• Set of Reusable Activities• Apply Same Workflow Rules• Can have design interface• Can have validation • Override Metadata Cache