vb.net 2d barcode generator Workflows as Web Services in C#

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Workflows as Web Services
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newPrice = currentPrice + (onePercent * multiplier * 0.4m); } // else if } // if else { // No change in price newPrice = currentPrice; } // else // Update the data store. newStockVals.Add(key, newPrice); } // foreach // Add to the cache. HttpContext.Current.Cache["StockVals"] = newStockVals;
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27. We need to add logic to test the stock s symbol, as it might not be a symbol we recognize. Search the Workflow1.cs code for the TestKnownStock event handler, and add this code to the body of that method:
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// Retrieve the cached stock values. System.Collections.Generic.Dictionary<string, decimal> stockVals = HttpContext.Current.Cache["StockVals"] as System.Collections.Generic.Dictionary<string, decimal>; // Check to see if the ticker symbol is in the // known stock list. Fault if not... e.Result = true; if (String.IsNullOrEmpty(Symbol) || !stockVals.ContainsKey(Symbol)) { // We don't have the desired stock in our list, // so return a fault. e.Result = false; StockFault = new System.Exception("The desired stock ticker symbol" + " is unknown."); } // if
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28. The last few lines of code to add are the code to assign the stock value to the return value property. The RecordStockValue method handles that, so locate the RecordStockValue method and add the following lines:
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// Place updated stock value in the dependency property // for return to the caller. System.Collections.Generic.Dictionary<string, decimal> stockVals = HttpContext.Current.Cache["StockVals"] as System.Collections.Generic.Dictionary<string, decimal>; StockValue = (decimal)stockVals[Symbol];
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External Data Communication
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29. The workflow itself is now complete. Save all open files, and compile the workflow by pressing Shift+F6 or by selecting Build GeneratorFlow from the Visual Studio Build menu. Correct any compilation errors you encounter before moving on. The workflow is now ready to be placed into an ASP.NET setting so that external clients can connect to the service and request stock values. Although you could create a new ASP.NET application and perform all the configuration magic yourself, the WF team kindly provided you with a superb feature that builds the ASP.NET project for you, error free. It could hardly be easier to use, too. Creating the ASP.NET Web application 1. This is so easy they should give the WF developer who came up with the idea a pay raise. Simply right-click the GeneratorFlow project name in Solution Explorer, and select Publish As Web Service. Visual Studio will grind for the briefest of moments and then display a confirmation dialog box. Click OK to dismiss this confirmation dialog box.
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2. Because that was entirely too easy, let s rename the .asmx file. (The name Visual Studio selects is a bit overwhelming.) Right-click the newly created GeneratorFlow.Workflow1_WebService.asmx file s name in Solution Explorer, and select Rename. Change its name to QuoteService.asmx. 3. Just to be sure, you can press Shift+F6 or select Build Web Site from the main Build menu. This step isn t required, but it will precompile the Web application so that when you reference it to retrieve its WSDL you ll save a bit of time at that point. If there were any errors, you could correct them, but you should find none. If you receive schema warnings for the values Visual Studio placed for you into the Web.config file, ignore those. The final task is to return to the original program file, add a Web Reference to its project, and test the XML Web service. That s next. Creating the XML Web Service client application 1. Right-click the QuoteGenerator project name in Solution Explorer, and select Add Web Reference.
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Workflows as Web Services
2. When the Add Web Reference dialog box appears, click the Web Services In This Solution link.
3. As there is only one XML Web service in the QuoteGenerator solution, the QuoteService XML Web service is the only service that appears. Click the QuoteService link to continue.
Part IV
External Data Communication
4. Visual Studio invokes the WSDL generation capabilities of the QuoteService XML Web service and displays the methods it finds. In this case, there is only one method. You could, if you like, click the method name and test the method. For now, click Add Reference to add the Web Reference to the QuoteGenerator project.
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