By Troy Magennis
Your entire Example-Rich consultant to utilizing and increasing LINQ to things and PLINQ
Using LINQ to things, .NET builders can write queries over item collections with an analogous deep performance that used to be to be had in simple terms with SQL and relational databases. Now, for the 1st time, builders have a accomplished and authoritative consultant to employing LINQ to things in real-world software program. Microsoft MVP Troy Magennis introduces cutting-edge ideas for operating with in-memory collections extra elegantly and efficiently—and writing code that's exceedingly strong, strong, and versatile.
Drawing on his unsurpassed adventure coding software program utilizing LINQ and webhosting the preferred HookedOnLINQ.com web site, Magennis provides well timed, lifelike ideas to a large spectrum of improvement demanding situations, comparable to combining facts from a number of assets, and reaching optimum functionality with super huge units of knowledge. You’ll commence with short quick-starts that stroll you thru LINQ to things’ key gains and question syntax. subsequent, you’ll drill right down to specified thoughts for employing and lengthening those positive aspects with C# 4.0 and C# 3.0—including code examples that mirror the realities of creation development.
- Writing simple LINQ queries with C#: filtering, projecting, and sorting info from in-memory collections
- Mastering complicated concepts for grouping and becoming a member of facts and knowing the functionality implications of every technique
- Taking complete good thing about LINQ’s usual question operators
- Creating customized question operators that stick with most sensible practices for coding styles and mistake handling
- Writing extra fluent, readable LINQ queries with C# 4.0’s language improvements, together with the recent dynamic features
- Combining LINQ with COM-Interop to entry information assets corresponding to Microsoft Excel
- Using Parallel LINQ to things (PLINQ) to optimize queries for multi-core processors, and the way to construct customized parallel question operators
- Integrating the easiest LINQ to things styles into your day by day coding
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Extra info for LINQ to Objects Using C# 4.0: Using and Extending LINQ to Objects and Parallel LINQ (PLINQ) (Addison-Wesley Microsoft Technology Series)
The variable cannot refer to itself. Although the usefulness of declaring a variable in this way seems minor, it is a necessary feature for declaring some types that have no other legal way of being declared (Anonymous Types, for instance). Anonymous Types Anonymous types are compile-time generated types where the public properties are inferred from the object initialization expression at compile-time. These types can then be used locally within a method as temporary data storage classes, avoiding having to build a speciﬁc data class for any and every set of properties.
EBook Query Syntax Style Options 43 which part of a query the extension method syntax applies to. If you do mix styles, keep them together; for example, use the query expression at the start surrounded by parentheses, then the extension methods at the end for the necessary operators (as shown in all examples in this book when mixing was needed). My preference (because of my SQL background perhaps) is to use the query expression syntax wherever possible and then revert to using the extension method syntax when using an operator not supported by query expressions (the Distinct operator, for instance), but I always add these operators at the end of the query.
State == ”WA”); Lambda expressions build upon the original anonymous method syntax by improving compile time type inference (the compiler works out the types of the arguments in most cases, eliminating the need to specify the input argument parameter types) and simplifying the syntax by eliminating the delegate keyword and the return statement for Expression bodies. NOTE Lambda expressions are generally single-expression delegates (only contain a single expression) when used with LINQ due to their limitation of not being convertible to expression trees.