Windows flow foundation

Net Framework for building workflows. It is not an application or a server product, and is included as a component of the. The platform unleashes the power of a completely different paradigm. Some of the major criteria for workflows are listed below:. There are two major types of workflows -. Workflows can either be built declaratively by using only Markup, or only Code or a combination of both Markup and code.

Net Web Sites and Web Services. Activities : Workflows consist of one or more activities. Activities are the building blocks of workflows. A set of pre-built activities is provided for developers. You can also build your own custom activities. Services : The workflow runtime engine uses many services when executing a workflow instance. You can either use the services in the Windows Workflow Foundation, or you can customize the available services, or you can build your own services.

Long Running Workflow : Workflows in real life can have a long and unpredictable execution life. The Windows Workflow Foundation handles this capability and can persist workflows, as required.

Compensation : Transactions in the workflow world are different compared to traditional transactions. Add the following statement at the top of Program. Replace the line of code that creates the new WorkflowApplication with the following code that creates and passes a dictionary of parameters to the workflow when it is created. This dictionary contains one element with a key of MaxNumber. Keys in the input dictionary correspond to input arguments on the root activity of the workflow.

MaxNumber is used by the workflow to determine the upper bound for the randomly generated number. Modify the Completed handler to retrieve and display the number of turns used by the workflow. Add the following code at the top of the Main method just after the existing AutoResetEvent declaration.

Add the following Idle handler just below the existing three workflow life-cycle handlers in Main. Each time the workflow becomes idle waiting for the next guess, this handler is called and the idleAction AutoResetEvent is set. The code in the following step uses idleEvent and syncEvent to determine whether the workflow is waiting for the next guess or is complete.

In this example, the host application uses auto-reset events in the Completed and Idle handlers to synchronize the host application with the progress of the workflow. It is not necessary to block and wait for the workflow to become idle before resuming a bookmark, but in this example the synchronization events are required so the host knows whether the workflow is complete or whether it is waiting on more user input by using the Bookmark.

For more information, see Bookmarks. Remove the call to WaitOne , and replace it with code to gather input from the user and resume the Bookmark. Try to guess the number in as few turns as possible. For instructions about how to add persistence to a workflow application, see the next topic, How to: Create and Run a Long Running Workflow. Skip to main content. This browser is no longer supported. Windows Workflow Foundation Programming A set of primer topics that you should understand to become a proficient WF programmer.

Extending Windows Workflow Foundation A set of topics that discusses how to extend or customize Windows Workflow Foundation to suit your needs. Windows Workflow Foundation Glossary for. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode.