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Conclusion
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This chapter introduced the concept of rules-based workflows and how they can be accommodated in WF. First, this chapter looked at using rules within conditions of an IfElse activity and then looked at the Policy activity. This chapter explained how to use the Rule Set Editor to define rules that can be used within a Policy activity. The real-world example in this chapter showed how to change the Purchase Order application built in previous chapters to use Declarative Rule Condition instead of Code Condition. The next chapter will cover workflow and Web services.
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Workflow and Web Services
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indows Workflow Foundation provides an activity to work with Web services, as well as several activities that allow your workflow to become a Web service. Web services are slowly becoming more prevalent in applications, especially with the usage of Service-Oriented Architecture (SOA). This chapter will introduce the InvokeWebService activity, which allows you to work with an existing Web service. I ll also introduce three other activities WebServiceInput, WebServiceOutput, and WebServiceFault that allow you to create your workflow as a Web service.
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In this chapter, I m not going to argue the pros and cons of using Web services. Web services are an architectural component that many developers use in their applications, although many other developers don t. Plenty of books and articles are available about Web services and the use of them. This chapter will concentrate on using a Web service from within workflow using the InvokeWebService activity. You can use the InvokeWebService activity in both the Sequential and State Machine workflows. It s similar to using a Web service in any other .NET application. First, you must reference the Web service, then you can access it. This section of the chapter will demonstrate a simple Web service that simply returns a value of True. Although this is impractical in the real world, it gives a good example of how the interaction works. At the end of this chapter, I ll show a more practical use of this activity. The first step in this example is to create a simple Web service. The completed Web service, SimpleWebService, is included with the code download. However, if you wish to build the Web service, here are the steps to do it. If you aren t familiar with Web services, you can find an introduction to Web services in 10 of my book Beginning Object-Oriented ASP.NET 2.0 with VB.NET (Apress, 2005). Create a new Web site, choose ASP.NET Web Service, and call the service SimpleWebService. When the Web service is created, open the Service.vb file if it isn t already open. Replace the HelloWorld default Web method with the following:
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CHAPTER 6 WORKFLOW AND WEB SERVICES
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Public Function IsUser(ByVal UserName As String) As Boolean If UserName = "Brian" Then Return True Else Return False End If End Function Build the Web service, then close the project. To test the Web service, enter http://localhost/ SimpleWebService/Service.asmx in your Web browser. The Service Web Service default page appears, listing the Web methods (IsUser). Click the IsUser link, enter Brian as the UserName parameter, and click Invoke. An XML document appears in a new browser window; it says True. Close the XML document window, enter Me as the UserName parameter, and click Invoke. This time the XML document contains False. This shows the Web service is working correctly. Create a new VB Sequential Workflow Console Application called VBWebServiceSequentialConsole. Drag an InvokeWebService activity onto the Workflow Designer. As soon as the activity is added to the workflow, the Add Web Reference window appears. Click the Web Services on the Local Machine link. A list of the Web services on the local machine is listed here. Find the link with the URL listed as http://localhost/SimpleWebService/Service.asmx. The Services column lists Service. Click the URL. The Service default page appears as it did in the browser previously. Change the Web Reference Name to SimpleWebService and click the Add Reference button. This is the same as adding a Web Reference to a VB or C# application. After the Add Web Reference window closes, click the InvokeWebService activity and view the properties. Change the name to InvokeSimpleWebService. Click the MethodName property and choose IsUser from the drop-down. Each InvokeWebService activity allows you to interact with one Web method exposed by the Web service. Once you choose IsUser, the (ReturnValue) and UserName properties appear under Parameters, as shown in Figure 6-1. These two properties allow you to provide values or variable names that contain the values to send to the Web method when it s called.
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