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In our first example, we ll create custom implementations of the Where and Select operators. Our methods will just delegate the processing to the standard Enumerable.Where and Enumerable.Select implementations. Listing 12.8 shows two operators implemented in a class named CustomImplementation inside the LinqInAction.Extensibility namespace.

Listing 12.8 Custom implementations of Where and Select with the standard generic signatures (CustomImplementation.csproj)



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The garbage collector implements the Collect method, which forces the garbage collector to delete all objects pending deletion. This method should not be called from within your application, as the collection cycle runs on a high priority thread. The collection cycle may freeze all the UI threads, resulting in an unresponsive user interface.

using System; using System.Collections.Generic; using System.Linq; namespace LinqInAction.Extensibility { public static class CustomImplementation { public static IEnumerable<TSource> Where<TSource>( this IEnumerable<TSource> source, Func<TSource, Boolean> predicate) { Console.WriteLine("in CustomImplementation.Where<TSource>");

So long as those objects are computer names, everything should work fine Another way to execute it would be this:.

return Enumerable.Where(source, predicate); } public static IEnumerable<TResult> Select<TSource, TResult>( this IEnumerable<TSource> source, Func<TSource, TResult> selector) { Console.WriteLine( "in CustomImplementation.Select<TSource, TResult>"); return Enumerable.Select(source, selector); } } }





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In order to use these new implementations of the two operators, all we need to do is import the LinqInAction.Extensibility namespace instead of the System.Linq namespace:

//using System.Linq; using LinqInAction.Extensibility; using LinqInAction.LinqBooks.Common; class TestCustomImplementation { static void Main() { var books = from book in SampleData.Books where book.Price < 30 select book.Title; ObjectDumper.Write(books); } }

For more information, see Garbage Collection Guidelines, Finalize and Dispose Guidelines, Dispose Pattern, and Finalize and Dispose Guidelines in Improving .NET Application Performance and Scalability at http://msdn.microsoft.com/library /default.asp url=/library/en-us/dnpag/html/scalenetchapt05.asp.

Of course, executing this program will display our trace information:

in CustomImplementation.Where<TSource> in CustomImplementation.Select<TSource, TResult> Funny Stories LINQ rules Bonjour mon Amour

That s it for our first example. You ve just seen how to provide your own implementation of the Where and Select operators. Here, we ve simply added some trace information, which can be useful if you want to better understand how queries

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work. Of course, you could do something completely different and more useful. Maybe you could rewrite the basic query operators to improve their performance Let s make that a challenge for you. Please let us know if you can imagine ways to do that! Before moving on to our next example that shows another custom implementation of the basic query operators, we d like to point out that the mechanism we ve just demonstrated comes with a limitation that we ll explain in the next section.

Windows Forms provide a rich user interface for your smart client application and there are a number of techniques you can use to help ensure that Windows Forms provides optimal performance. Before discussing specific techniques, it is useful to review some high-level guidelines that can increase Windows Forms performance substantially. Beware of handle creations. Windows Forms virtualizes handle creation (that is, it creates and re-creates window handle objects dynamically). Creating handle objects can be expensive; therefore, avoid making unnecessary border style changes or changing MDI parents. Avoid creating applications with very many child controls. The Microsoft Windows operating system has a limit of 10,000 controls per process, but you should avoid having many hundreds of controls on a form as each control consumes memory resources. The rest of this section discusses more specific techniques you can use to optimize the performance of your application s user interface.

function GetServerInfoWork { Define worker function param([string]$computername) Define single-string parameter $os = Get-WmiObject Win32_OperatingSystem -computer $computername

There is an important limitation you need to keep in mind when implementing the query expression pattern: You cannot implement one or two operators and mix them with the default ones if the signatures of your implementations and the default ones are the same. This is due to the way extension methods are resolved. Let s say we change our query expression to sort the results:

var query = from Book book in SampleData.Books where book.Price < 30 orderby book.Title select book.Title;

As you can see, a new query operator gets involved: OrderBy. The problem is that since we provide implementations only for Where and Select, the compiler complains that it can t find an implementation for OrderBy:

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