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As you can see in the code, the Sum operator is implemented as four method overloads. These methods can be easily adapted to create the LongSum operator. Listing 12.2 shows the source code that implements the same four methods but with longs as the results.

Listing 12.2 LongSum, improved implementation of the Sum operator for int (SumExtensions.cs)



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using System; using System.Collections.Generic; using System.Linq; namespace LinqInAction.Extensibility { public static class SumExtensions { public static long LongSum(this IEnumerable<int> source) { if (source == null) throw new ArgumentNullException("source"); long sum = 0; checked { foreach (int v in source) sum += v; } return sum; } public static long LongSum(this IEnumerable<int > source) { if (source == null) throw new ArgumentNullException("source"); long sum = 0; checked { foreach (int v in source) if (v != null) sum += v; } return sum; } public static long LongSum<T>(this IEnumerable<T> source, Func<T, int> selector) { return SumExtensions.LongSum(Enumerable.Select(source, selector)); } public static long LongSum<T>(this IEnumerable<T> source, Func<T, int > selector) { return SumExtensions.LongSum(Enumerable.Select(source, selector)); } } }





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The new LongSum operator we ve just created in listing 12.2 returns the numerical sum of a sequence of ints or nullable ints as a long or nullable long. This gives more range for the results compared to the default Sum operator. This demonstrates how you can improve your LINQ experience with query operators that work the way they should, or at least the way you want them to work. This kind of extensibility ensures that you are not stuck with a static predefined set of operators. The example we ve just seen shows how to fix a problem with a standard query operator. But this isn t the only way we can extend LINQ to solve a problem or to improve our code. Creating custom query operators can be useful in other situations, as you ll see next.

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To minimize the startup time of your application, you should follow these guidelines: Minimize member variables in your application s main form class This will minimize the number of types that have to be resolved when the CLR loads the main form class Minimize the immediate use of types from large base class assemblies, such as the XML libraries or the ADONET libraries These assemblies take time to load Using the application configuration classes and the trace switch features will bring in the XML library Avoid this if application startup time is a priority Lazy load where possible Fetch data only when demanded instead of loading upfront and freezing the UI Design your applications to use fewer assemblies Applications with large numbers of assemblies incur increased performance cost.

Our first example revolved around a standard query operator The default set of operators that comes with LINQ to Objects is useful and can be applied to a wide range of situations This is possible especially since these operators are generic: they can be used with any type of objects However, when you are dealing with business objects, specific operations may be required Imagine you are working on Book and Publisher objects How do you determine whether a book is expensive in a LINQ query How do you retrieve a publisher s books The standard query operators may not be adapted to satisfy such needs because as we mentioned earlier, they re generic! While being generic is a big advantage, it doesn t help when business-specific processing or concepts are required, because more specialized assistance is needed In situations like this, you would want to use custom utility query operators.

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