Professional windows workflow foundation amazon

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Add some now ». Welcome back. Imagine an application that has certain user interface components available when the workflow is in a given list of states. If information about the current workflow state were not available, you would have to implement duplicate logic in the client application to know when certain UI components should be available or enabled. However, the ability to query enables you to keep all the process logic in the workflow, where it should be.

All the client application has to do is ask the workflow what state it is in and what states can come next. Logic can then be implemented to make the appropriate UI components available to the user. Skipping Steps Another way in which the StateMachineWorkflowInstance class provides flexibility in managing workflows is by allowing the client to programmatically set the current state of a workflow instance.

This functionally is achieved by calling the SetState method and passing either a string representation of a state or an instance of a StateActivity class. This means that no matter where the workflow is in its execution, and no matter what state the workflow is currently in, the SetState method obeys the command given by the code. It is important to let the workflow manage its own state; otherwise, the integrity of logic the workflow can degrade.

With that said, there are instances when using the SetState method is appropriate. Think of this method as an override option for certain steps in a workflow. Imagine a workflow that manages certain processing states of data cleansing.

Messages that come in to the workflow from outside sources might need to be processed into a common format. In this case, the workflow could have several states that represent different buckets of processing progress as well as exception states for when data cannot be easily transformed.

For example, when an exception state is reached, the workflow application could notify the appropriate employee and ask him or her to manually fix the problem. However, there might be cases where the employee, who should be an expert in the data, decides that the message looks good enough to progress and decides to skip the manual step. In such a case, the SetState method provides a great alternative to modeling every manual override in the workflow itself.

The client application used by the data analyst employees could have a button that enables them to override the manual intervention state, which then lets the data processing proceed as normal. Although the SetState method can provide a great way to manage manual overrides and other workflow exceptions, it should be used only when necessary.

Serialization - Contains classes that support the serialization of workflows and activities. Runtime - Contains classes and interfaces related to the workflow runtime. The most notable class in this namespace is WorkflowRuntime , which is responsible for the execution and maintenance of running workflow instances. The WorkflowInstance class is also important because it represents an active workflow. Configuration - Contains classes that allow the runtime to access predefined configuration data.

Configuration is an important part of Windows Workflow Foundation. Hosting - Contains classes related to the workflow runtime services introduced previously. All workflow runtime hosting classes are located here, from the base WorkflowRuntimeService class to the concrete default classes for treading and transactions. Tracking - Contains the actual runtime service classes as well as classes that define tracking profiles and channels.

Even though tracking falls under the umbrella of runtime services, this concept is sizeable enough to warrant its own namespace. Previous page. Table of content.