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Event Activities
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type Updates in the New Member Name field. Click OK. Visual Studio then adds the dependency property Updates.
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14. So that you can handle the events coming from the host, drag an instance of the Listen activity onto the designer s surface and drop it into the Sequence activity.
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15. If you recall, the IWFBroker interface specified five events. One of them, Stop, you ve already used, leaving four more to handle. The Listen activity presents only two EventDriven activity containers by default, but adding more is easy. Simply drag and drop three more EventDriven activity instances into the Listen activity you placed in the preceding step. Why add three more and not just two Because the fifth EventDriven activity contains a Delay activity that acts as a timer. When the delay expires, the Listen activity releases the workflow thread. The While activity then tests the condition, which later will always be set to return true, leaving the While loop to loop forever. The market values are updated and communicated to the host. The Listen activity then waits for another round of host events.
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Working with Activities
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16. Into the rightmost EventDriven activity, drag and drop a Delay activity. Name it updateDelay using the Properties pane.
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17. Next drag an instance of SellStock, from eBrokerFlow, onto the designer s surface, and drop it into the next rightmost EventDriven activity.
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Event Activities
18. Select the NumberOfShares property in the Visual Studio Properties pane, and click the browse ( ) button to again activate the Bind NumberOfShares To An Activity s Property dialog box. Click the Bind To A New Member tab, click Create Field, and type _sharesToSell in the New Member Name field. Click OK. Visual Studio then adds the field _sharesToSell.
Note
I chose to create _sharesToSell as a field instead of as a dependency property simply because the field is never accessed outside the Workflow1 class. The XML-based market values are provided to the host, however, and should be exposed to outside access.
19. The Symbol property must also be bound. Follow the same procedure as in the preceding step, but name the field _tickerToSell.
Part II
Working with Activities
20. To actually perform the stock sale, drag an instance of the Code activity and drop it below the SellStock event handler. Into its ExecuteCode property, type SellStock. Once the code for SellStock is added, return to the visual workflow designer.
21. Now let s buy some stock. Drag a BuyStock event handling activity (again from eBrokerFlow) onto the designer s surface, and drop it into the middle EventDriven activity.
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Event Activities
22. Bind the BuyStock activity s NumberOfShares property to a new field, _sharesToBuy, using the method outlined in step 18. Bind its Symbol property to a new field, _tickerToBuy, as you did in step 19. 23. Just as you needed a Code activity to sell stock, so will you need a Code activity to buy stock. Repeat step 20 and add a new Code activity, naming its ExecuteCode method BuyStock.
24. Repeat steps 17 through 20 two more times, adding the RemoveTicker and AddTicker events to the Listen activity. The RemoveTicker activity should have its TickerXML property bound to a new _tickerToRemove field, while the Code activity for the RemoveTicker event should have its ExecuteCode property assigned to be RemoveTicker. Similarly, AddTicker should have its TickerXML property bound to _tickerToAdd, with the
Part II
Working with Activities
associated Code activity s ExecuteCode property assigned to be AddTicker. The completed Listen activity appears as you see here.
25. Compile your workflow by pressing Shift+F6, and correct any errors before adding code. The visual aspects of the workflow development are now complete. 26. Open the Workflow1.cs file for editing within Visual Studio. 27. Visual Studio added quite a bit of code for you, so first locate the Workflow1 constructor and insert this code following the constructor. The code you are inserting you probably recognize as initialization code. When the workflow is started, you ll pass the workflow a dictionary of watched stock items contained in a collection of Tickers items keyed by the stock ticker symbol, such as CONT. You also need to provide the polling interval, which is the amount of time the workflow waits before rechecking the stock-market values.
private Dictionary<string, eBrokerService.Ticker> _items = new Dictionary<string, eBrokerService.Ticker>(); private string _tickersXML = null; public string TickersXML { get { return _tickersXML; } set { _tickersXML = value; } } private TimeSpan _interval = TimeSpan.FromSeconds(7); public TimeSpan PollInterval { get { return _interval; } set { _interval = value; } }
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