code to generate barcode in vb.net Invoking Web Services from Within Your Workflows in Visual C#

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Invoking Web Services from Within Your Workflows
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4. Although you might expect to see the behavior you ve seen throughout this book a rounded rectangle appearing on the designer s surface what you are presented with instead is the Visual Studio Add Web Reference dialog box. Because you ve not identified a previous Web reference suitable for use in this project, let s complete the addition of the Web reference and the initial InvokeWebService activity property settings. Click the Web Services In This Solution link to proceed.
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5. The only XML Web service present in the solution is for the QuoteService. Click the QuoteService link to proceed.
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Note
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QuoteService prepopulates a Dictionary object with the three stock symbols used in 10 along with their initial values. Then it places the Dictionary object in the ASP.NET cache for use when the XML Web service is invoked. (See Global.asax for the code that initializes the cache.)
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Part IV
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External Data Communication
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6. Visual Studio works for a moment it s loading the WSDL for the service and parsing it for methods the service exports. Once it has loaded the WSDL and presented you with the methods the service exposes, the Add Reference button is enabled. Click it to add the Web reference to your project.
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Visual Studio also adds the familiar rounded-corner rectangle to the visual workflow designer, this being the instance of InvokeWebService you just dropped into your workflow.
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7. Most of the settings for invokeWebService1 have been established for you by Visual Studio. However, you must tell Visual Studio what method you want to call with this instance of the InvokeWebService activity. In the Properties pane, select the MethodName property to activate the down arrow, and then click the down arrow. Select GetQuote from the list.
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Invoking Web Services from Within Your Workflows
8. Selecting the method name causes Visual Studio to examine the method and add the parameters the method supports to the Properties pane. Select the (Return Value) property to activate the familiar browse (...) button. Click the browse button to activate the Bind (Return Value) To An Activity s Property dialog box. Click the Bind To A New Member tab, and type StockValue in the New Member Name field, making sure the Create Property option is selected. Click OK to add the StockValue dependency property to your workflow.
9. Do the same for the symbol property, naming its dependency property Symbol.
Part IV
External Data Communication
10. The InvokeWebService activity is now fully configured for this workflow, so drag a copy of the Code activity onto the visual workflow designer s surface and drop it below invokeWebService1. Assign its ExecuteCode property to be DisplayQuoteValue.
11. Visual Studio adds the DisplayQuoteValue method and switches you to the code editor. Add this code to the DisplayQuoteValue method Visual Studio just added:
if (StockValue >= 0) { // Found the stock value. Console.WriteLine("The value for '{0}' is: {1}", Symbol, StockValue.ToString("C")); } // if else { // Unknown stock. Console.WriteLine("Stock symbol '{0}' is unknown...please try" + " again using a valid stock symbol.", Symbol); } // else
12. Compile the entire solution by pressing F6, or by selecting Build Solution from Visual Studio s Build menu. Correct any compilation errors that might appear. 13. The main application expects a stock ticker symbol as the only command-line argument. The XML Web service has information for only three ticker symbols: CONT, LITW, and TSPT. Therefore, these are the only three values you can pass into the application. If you execute the application and pass in the CONT stock symbol, the program s output appears something like the following:
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Invoking Web Services from Within Your Workflows
The output value for the stock will vary because random numbers are used in the simulation the XML Web service implements, but the application should still execute and retrieve the stock value from the XML Web service. If there is a problem, the returned exception is shown for debugging purposes. Generally, restarting the Web server is all you ll need to do. If you want to continue to the next chapter, keep Visual Studio 2005 running and turn to 19, Workflows as Web Services. In this final chapter, we ll look at the converse of this chapter, which is how workflows can host an XML Web service. If you want to stop, exit Visual Studio 2005 now, save your spot in the book, and close it. I couldn t blame you...InvokeWebService is a great activity and very useful. No doubt you want to experiment. We ll see you in the last chapter.
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