LINQ to Objects Using C# 4.0: Using and Extending LINQ to by Troy Magennis

By Troy Magennis

I discovered this publication to be Most worthy of all of the Linq books i've got encounter. It offers nice sensible examples of the way to take advantage of Linq successfully on information items and shop thousands of strains of code. even as, the writer explains the functionality implications for you to make the ideal choice in your software. This publication used to be an outstanding locate for me as I had a troublesome time final yr whilst i attempted to exploit Linq in a few advanced manipulation of items concerning joins.
The simply sadness for me was once the truth that whilst I first I learn the booklet on-line on Safari Books, the examples have been in colour and syntax highlighted. i made a decision to buy the published publication to have it as a reference. The print variation isn't really in colour and turns out a step backwards.
I hugely suggest this e-book to any developer that makes use of Linq. not only for gadgets. it's good proposal out and brilliantly written with genuine lifestyles examples.

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Additional info for LINQ to Objects Using C# 4.0: Using and Extending LINQ to Objects and Parallel LINQ (PLINQ)

Sample text

Query1 makes use of anonymous types (line 7), Object Initialization (line 9 and 10), and implicitly typed local variables (line 5). The code shown in query2 is similar to how the compiler converts the query expression syntax into extension method calls, and free-form expressions throughout the query into lambda expressions. This step is transparent and automatic during compilation and is shown here to give you a glimpse into how LINQ query syntax is decomposed into more traditional code constructs.

Any public field or property can be assigned in the initialization statement by assigning that property name to a value; multiple assignments can be made by separating the expressions with a comma. The C# compiler behind the scenes calls the default constructor of the object and then calls the individual assignment statements as if you had previously assigned properties in subsequent statements manually. DateOfBirth = new DateTime(1973, 12, 09); // new initialization syntax => single statement Contact contactNew = new Contact { LastName = ”Magennis”, DateOfBirth = new DateTime(1973, 12, 09) }; 22 Chapter 2 Introducing LINQ to Objects Although it seems to be a trivial (albeit useful) improvement in syntax in the general form, it is essential when you begin to write LINQ queries and need to construct object instances as part of their result set by setting property values on-the-fly.

Collection Initializers With similar ambitions as the Object Initializer syntax, collection initialization was given similar functionality to improve the common construct and then add pattern. IEnumerable and have an appropriate overload for an Add method to support the new initialization syntax. Listing 2-3 demonstrates the use of the new collection initialization syntax and shows the before and after equivalent code patterns. It also demonstrates how to combine collection initialization with Object Initialization, which helps keep the code cleaner and generally easier to read.

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