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Windows Workflow Foundation (WF) is a Microsoft technology that provides an API, an in-process workflow engine, and a rehostable designer to implement long-running processes as workflows within .NET applications. The current version of WF was released as part of the .NET Framework version 4.5 and is referred to as (WF45).〔(【引用サイトリンク】title=A Developer's Introduction to Windows Workflow Foundation (WF) in .NET 4 )〕 A workflow, as defined here, is a series of distinct programming steps or phases. Each step is modeled in WF as an Activity. The .NET Framework provides a library of activities (such as WriteLine, an activity that writes text to the console or other form of output). Custom activities can also be developed for additional functionality. Activities can be assembled visually into workflows using the Workflow Designer, a design surface that runs within Visual Studio. The designer can also be hosted in other applications. Encapsulating programming functionality into the activities allows the developer to create more manageable applications; each component of execution can be developed as a Common Language Runtime object whose execution will be managed by the workflow runtime. ==Workflow Foundation versions== * Workflow Foundation was first released in Version 3 of the .NET Framework, and primarily uses the System.WorkflowActivities, System.Workflow.ComponentModel, and System.WorkflowRuntime namespaces. Workflows in version 3 were created using either the Sequential model (in which activities are executed in order, with the completion of one activity leading to the next), or the State Machine model (in which activities are executed in response to external events). Microsoft SharePoint 2007 uses WF 3. * In .NET 3.5, messaging activities were introduced that integrated Workflow with Windows Communication Foundation (WCF). With the new ReceiveActivity, workflows could respond to incoming WCF messages. The new features of Workflow in version 3.5 use the System.ServiceModel namespace. Microsoft SharePoint 2010 uses WF 3.5. * In .NET 4, Windows Workflow Foundation was largely updated, with new features such as Data Contract Resolver, Flowchart, and other flow control activities added. Workflow in .NET 4 uses the SystemActivities namespace. Most notably, there is no longer a Workflow Runtime object in version 4; workflows are executed directly using WorkflowApplication or WorkflowInvoker instead. * Activities created in previous versions of the .NET Framework can be executed by .NET 4 workflows using the Interop activity. * Future versions and releases of WF will include an updated State Machine and Dynamic Update. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Windows Workflow Foundation」の詳細全文を読む スポンサード リンク
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