Workflows of the .NET Framework
Sent by Christine La yug on July 25th 2008 source
Windows Workflow Foundation or WF is a Microsoft technology for defining, executing, and managing workflows. This technology is part of .NET Framework 3.0 which is available natively in the Windows Vista operating system, and can be installed on the Windows XP SP2 and Windows Server 2003 operating systems. A new XML-based language called XAML is commonly used for declaring the structure of a workflow. However, the workflow may also be expressed in code using any .NET-targeted language. WF provides .NET developers with the ability to separate the logic of their application from the underlying execution components, thus providing a clearer, more manageable representation of the application. Learn more of WF with the austin .net consultant. This approach lends credence to the growing process-driven application methodology which aims to separate an application's logical flow from its executable components at an enterprise level. Workflows comprise 'activities'. Developers can write their own domain-specific activities and then use them in workflows. WF also provides a set of general-purpose 'activities' that cover several control flow constructs. Windows Workflow Foundation is supported by a companion set of extensions to Visual Studio 2005. These extensions contain a visual workflow designer which allows users to design workflows, a visual debugger which enables the users to debug the workflow designed, and a project system which enables the user to compile their workflows inside Visual Studio 2005. Visit the austin .net consultant to learn more of this. WF workflows define interfaces with methods and events to communicate with the outside world. A host application typically sets up an environment before running a workflow, providing objects that implement those interfaces. When an object implementing such interfaces raises an event, the corresponding workflow is retrieved and the data passed on to it. Methods on the interface may be used by the workflow to communicate with its host. Data can also be transferred from the host to the Workflow through dictionary objects that are passed to the Workflow when the Workflow is created. Similarly the Workflow can pass the results of the workflow to the Host application through a Dictionary Object. The Workflow foundation also allows the Workflow to update the Host application of the progress of the workflow. This is done by raising events in the Workflow to which the host application will subscribe. For more information about Windows Workflow Foundation or WF, or about .NET Framework, then visit the austin .net consultant for more details.
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