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The ToList() method causes the LINQ expression to be evaluated immediately. The end result is an ordinary collection, which you can deal with in all the usual ways. For example, you can wrap it in an ObservableCollection to get notification events, so any changes you make are reflected in bound controls immediately: Dim productMatchesTracked As _ New ObservableCollection(Of Product)(productMatches) You can then bind the productMatchesTracked collection to a control in your window.

OnPause() and OnContinue()

LINQ uses deferred execution. Contrary to what you might expect, the result of a LINQ expression (such as the matches object in the previous example) isn t a straightforward collection. Instead, it s a specialized LINQ object that has the ability to fetch the data when you need it, rather than when the LINQ expression is created. In this example, the matches object is an instance of the WhereIterator class, which is a private class that s nested inside the System.Linq.Enumerable class: matches = From product In products _ Where product.UnitCost >= 100 _ Select product Depending on the specific query you use, a LINQ expression might return a different object. For example, a union expression that combines data from two different collections would return an instance of the private UnionIterator class. Or, if you simplify the query by removing the where clause, you ll wind up with a simple SelectIterator. You don t actually need to know the specific iterator class that your code uses because you interact with the results through the IEnumerable(Of T) interface. (But if you re curious, you can determine the object type at runtime by hovering over the appropriate variable in Visual Studio while in break mode.) The LINQ iterator objects add an extra layer between defining a LINQ expression and executing it. As soon as you iterate over a LINQ iterator like WhereIterator, it retrieves the data it needs. For example, if you write a foreach block that moves through the matches collection, this action forces the LINQ expression to be evaluated. The same thing happens when you

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Action commands, listed below, allow you to perform various actions on those items under source code control. Add Branch Branches Checkin Checkout Configure Delete Dir Get History Label Lock Merge Merges Permission Properties Rename Resolve Shelve Status Undelete Undo Unlabel Unshelve View Workspace

bind an IEnumerable(Of T) object to a WPF window, in which case the WPF data binding infrastructure iterates over its contents.

Two common event handlers you may implement are OnPause() and OnContinue(). Obviously these handles are triggered when the Windows services is paused and continued. You use these events to temporarily stop and then later restart any resources that don t need to be active while the Windows service is paused. To continue our example, there is no need to have the timer continue to run while the Windows service is paused. (In fact, if you don t stop the timer, you have not actually paused the service.) When the Windows service finally continues, you obviously need to start the timer back up. Here is the code to handle the pause and continue process: virtual void OnPause() override { this->timer->Stop(); eventLog1->WriteEntry("SimpleWinService Paused"); } virtual void OnContinue() override { eventLog1->WriteEntry("SimpleWinService Continued"); this->timer->Start(); } The only trick to using these two handlers is that you need to manually add them to your code, but as you can see, it s hardly rocket science.

s Note There s no technical reason why LINQ needs to use deferred execution, but there are many reasons

Summary

There are a few more ServiceBase class handlers that you might use, but I thought it a bit redundant showing examples of using them, as you code them the exact same way as the other handlers. There is one exception, the OnCustomCommand(), but I will hold off covering this handler until I cover managing Windows services later in the chapter.

why it s a good approach. In many cases, it allows LINQ to use performance optimization techniques that wouldn t otherwise be possible. For example, when using database relationships with LINQ to SQL, you can avoid loading related data that you don t actually use. Deferred execution also allows optimizations when you create LINQ queries that act on top of other LINQ queries.

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