Bộ chuyển đổi của chúng tôi với các dữ liệu cần thiết có thể dẫn đến một số lượng tốt mã, đặc biệt là nếu chúng ta sử dụng các truy vấn tham số. Hãy nhớ lại trong chương 22 là một truy vấn tham số cho phép chúng ta xây dựng một câu lệnh SQL bằng cách sử dụng một tập hợp của các đối tượng tham số. | Simpo PDF Merge and Split Unregistered Version - http 952 CHAPTER 26 INTRODUCING WINDOWS WORKFLOW FOUNDATION If you are interested in learning more about building custom activities the .NET Framework SDK documentation provides a number of interesting examples including the construction of a Send E-mail Activity. For more details simply browse the Custom Activities samples found under the WF Samples node of the provided documentation see Figure 26-29 . Figure 26-29. The .NET Framework SDK documentation provides numerous workflow examples. Summary Windows Workflow Foundation WF is an API that was released with .NET . In essence WF allows you to model an application s internal business processes directly within the application itself. Beyond simply modeling the overall workflow however WF provides a complete runtime engine and several services that round out this API s overall functionality transaction services persistence and tracking services etc. . While this introductory chapter did not examine these services in any great detail do remember that a production-level WF application will most certainly make use of these facilities. When building a workflow-enabled application Visual Studio 2008 provides several designer tools including a workflow designer configuration using the Properties window and most important the Windows Workflow Toolbox. Here you will find numerous built-in activities that constitute the overall composition of a particular workflow. Once you have modeled your workflow you are then able to execute the workflow instance using the WorkflowRuntime type using your host of choice. PART 6 Desktop User Interfaces Simpo PDF Merge and Split Unregistered Version - http .
