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The three properties in Table 19-1 must have assigned values, although IsActivating defaults to False. Omitting any property assignments results in validation and compilation errors. IsActivating allows you to control secondary Web service calls into your workflow. The primary call, the Web Service method call that kicks off the workflow, should have IsActivating set to True. If your workflow then allows secondary calls from the client, such as when accepting inputs that act as events in a state-based workflow, the secondary WebServiceInput activities should have IsActivating set to False or else the workflow starts anew. If you allow a second instance of your workflow to start, the second instance will block if it shares session state with the first workflow instance and potentially cause a deadlock. Therefore, use multiple activating WebServiceInput activities with great care. When you assign the MethodName, keep in mind that the method parameters associated with that method also need to be bound or otherwise assigned. In Visual Studio, when you select
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Part IV
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a method to act as the MethodName, the method s parameters automatically appear in the activity s Properties pane for you to bind using the property binding dialog box you ve used throughout the book. You ll see this when working with the sample application for this chapter.
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The WebServiceOutput activity completes the XML Web service s processing by returning the value identified by the MethodName in the WebServiceInput activity. For this reason, you must assign the WebServiceOuput s InputActivityName property to be one of the WebServiceInput activities present in your workflow. Failing to assign the input activity name results in both validation and compilation errors. WebServiceOutput has a single method parameter to bind that being the return result if any is indicated by the method in the interface bound to the WebServiceInput activity this output activity is tied to. If the method returns void, no return value binding is possible. The WebServiceOutput activity then is reduced to signaling the end of the workflow processing for this Web method invocation. Interestingly, you can have multiple outputs for a single input, as might happen if the output activities are placed within separate Parallel activity execution paths, or in different branches of an IfElse activity. Different paths through your workflow might result in different outputs. What you cannot do is have multiple output activities in the same execution path. (The same holds true for the WebServiceFault activity as well.) If WF determines that more than one WebServiceOutput, or WebServiceFault combined with a WebServiceOutput, is in the same execution path, WF invalidates the activities and you need to correct the execution logic by moving or removing the offending activity or activities.
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The WebServiceFault activity is closely related to the WebServiceOutput activity. Both indicate the termination of workflow processing for the particular invocation they happen to be supporting. And, as it turns out, WebServiceFault is used just as WebServiceOutput is used. WebServiceFault is also tied to a single WebServiceInput activity. Like its cousin the WebServiceOutput activity, WebServiceFault has a single output property you must bind, in this case Fault. Fault is bound to a field or property based on System.Exception that represents the exception to report back to the client. Ultimately, Fault is translated into a SoapException and sent over the wire to the client. But any exception you care to bind is acceptable. ASP.NET translates the exception you provide into SoapException automatically.
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19
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Workflows as Web Services
Creating a Host Web Service Project
The final sample application for the book is one we ll create entirely from scratch. We ll begin by creating a simple console application, which does not need to reference the WF assemblies. This is because the workflow will be housed in an ASP.NET XML Web service, the workflow assembly for which we ll create next. With the workflow assembly ready, we ll publish the workflow as an ASP.NET Web service project, make some tweaks, and then add the code to invoke the workflow from the original console application. I mention the application creation process here before we start simply because it s circular and might appear odd at times because of its circular nature. Armed with the bigger picture, let s get started. Creating the basic workflow application 1. Start an instance of Visual Studio. Click its File, then New, and finally Project menu items. 2. When the resulting New Project dialog box appears, select Windows in the Project Types pane. (First expand the Visual C# tree control node if it isn t already expanded.) Select Console Application from the Templates list. 3. Type QuoteGenerator into the Name field and \Workflow\19 into the Location field. Click OK.
This creates both the console application you ll use to test the XML Web service and a solution file to which you can add more projects. The next step is to create a new sequential workflow library project and the stock quote workflow. Adding the sequential workflow library 1. With Visual Studio still running, right-click the QuoteGenerator solution name in Solution Explorer to activate the context menu. From the context menu, select Add and then New Project.
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