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19. Because we do want to return a stock value, we need to bind a workflow property to the (ReturnValue) property of webServiceOutputActivity1. Select the (ReturnValue) property once to activate the browse (...) button, and then click the browse button. When the Bind (ReturnValue) To An Activity s Property dialog box appears, select the Bind To A New Member tab and type StockValue into the New Member Name field. Make sure the Create Property option is selected, and then click OK.
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20. The last activity you should add is an instance of WebServiceFault. Drag a copy of the WebServiceFault activity onto the visual workflow designer s surface, and drop it into the right branch of ifElseActivity1.
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External Data Communication
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21. As you did with webServiceOutputActivity1, you need to assign webServiceFaultActivity1 s InputActivityName property. Select its InputActivityName property to activate the down arrow, and then choose webServiceInputActivity1 from the list. (It will be the only option available.)
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22. You then need to provide webServiceFaultActivity1 with an appropriate fault, so select its Fault property to activate the browse (...) button. Click the browse button to again bring up the Bind Fault To An Activity s Property dialog box. Click the Bind To A New Member tab, and type StockFault into the New Member Name field. Make sure the Create Property option button is selected, and click OK.
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23. The workflow is now complete from a visual design perspective, so open the Workflow1.cs file for code editing. Select Workflow1.cs in Solution Explorer, and click the View Code toolbar button. 24. The first bit of code to add will be a pair of using statements that allow us to access some ASP.NET structures. Add these to the end of the existing list of using statements:
using System.Web; using System.Web.Caching;
25. Next let s complete the CreateStocks event handler. Scroll down until you find CreateStocks, and add the following lines of code to that method:
System.Collections.Generic.Dictionary<string, decimal> stockVals = HttpContext.Current.Cache["StockVals"] as System.Collections.Generic.Dictionary<string, decimal>; if (stockVals == null) { // Create and cache the known stock values. stockVals = new System.Collections.Generic.Dictionary<string, decimal>(); stockVals.Add("CONT", 28.0m); stockVals.Add("LITW", 22.0m); stockVals.Add("TSPT", 24.0m); // Add to the cache. HttpContext.Current.Cache.Add("StockVals", stockVals, null, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, CacheItemPriority.Normal, null); } // if
26. Scroll down further and locate the UpdateMarketValues event handler. To the UpdateMarketValues handler, add the market update simulation code:
// // // // // Iterate over each item in the dictionary and decide what its current value should be. Normally we'd call some external service with each of our watch values, but for demo purposes we'll just use random values.
Part IV
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// Note this is essentially the same simulation code as // found in 10... Random rand = new Random(DateTime.Now.Millisecond); System.Collections.Generic.Dictionary<string, decimal> currentStockVals = HttpContext.Current.Cache["StockVals"] as System.Collections.Generic.Dictionary<string, decimal>; System.Collections.Generic.Dictionary<string, decimal> newStockVals = new System.Collections.Generic.Dictionary<string, decimal>(); foreach (string key in currentStockVals.Keys) { // Pull the item's value. decimal currentPrice = (decimal)currentStockVals[key]; // Set up the simulation. decimal newPrice = currentPrice; decimal onePercent = currentPrice * 0.1m; Int32 multiplier = 0; // no change // We'll now roll some dice. First roll: // market value change 0-79, no. 80-99, if (rand.Next(0, 99) >= 80) { // Yes, update the price. Next roll: // value increase or decrease 0-49, // 50-99, decrease. multiplier = 1; if (rand.Next(0, 99) >= 50) { // Decrease the price. multiplier = -1; } // if does the yes.
will the increase.
// Next roll, by how much We'll calculate it // as a percentage of the current share value. // 0-74, .1% change. 75-89, .2% change. 90-97, // .3% change. And 98-99, .4% change. Int32 roll = rand.Next(0, 99); if (roll < 75) { // 1% change newPrice = currentPrice + (onePercent * multiplier * 0.1m); } // if else if (roll < 90) { // 2% change newPrice = currentPrice + (onePercent * multiplier * 0.2m); } // else if else if (roll < 98) { // 3% change newPrice = currentPrice + (onePercent * multiplier * 0.3m); } // else if else { // 4% change
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