New PDF release: LINQ to Objects Using C# 4.0 Using and Extending LINQ to

By Troy Magennis

Utilizing LINQ to things, .NET builders can write queries over item collections with an identical deep performance that was to be had basically with SQL and relational databases. Now, for the 1st time, builders have a entire and authoritative advisor to using LINQ to things in real-world software program. Microsoft MVP Troy Magennis introduces state of the art suggestions for operating with in-memory collections extra elegantly and efficiently—and writing code that's enormously robust, strong, and versatile.

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Extra info for LINQ to Objects Using C# 4.0 Using and Extending LINQ to Objects and Parallel LINQ

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Listing 2-4 Local variable declaration, implicitly typed examples // implicitly typed local variable declarations var anInt = 1; var aString = ”Testing”; var listContact = new List(); var intArray = new int[] { 0, 1, 2, 3, 4 }; // the above are identical to the following declarations int anIntOld = 1; string aStringOld = ”Testing”; List listContactOld = new List(); int[] intArrayOld = new int[] { 0, 1, 2, 3, 4 }; // list is defined as type: List, // it shows how object and collection // initialization work with the var style init.

Lambda expressions infer the parameter type and return types in most cases, but if the compiler cannot determine the types, you must explicitly type them by adding a type before the parameter identifier. n => n < 5 (int n) => n < 5 n => n % 2 == 1 (n, index) => n < index (explicit parameter typing) (true for odd numbers) (multiple parameters) From the Library of Wow! eBook 28 Chapter 2 Introducing LINQ to Objects Lambda expressions will become second nature when you begin writing LINQ code; for now, just get comfortable with the fact that a lambda expression is simply a nicer way of passing code to another function to execute.

From the Library of Wow! eBook References 15 Expressing Code as Data Although not completely relevant to the LINQ to Objects story at this time, the ability to express LINQ queries as a data-structure opens new opportunities as to how that query might be optimized and executed at runtime. Net code into a specific domain query language, the full advantage of code built using data or changed at runtime hasn’t been fully leveraged at this time. One concept being explored by Microsoft is the ability to build and compile snippets of code at runtime; this code might be used to apply custom business rules, for instance.

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