LINQ For Dummies (For Dummies (Computer Tech)) - download pdf or read online

By John Paul Mueller

ISBN-10: 0470277947

ISBN-13: 9780470277942

ISBN-10: 0470406615

ISBN-13: 9780470406618

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Even a simple query includes an IEnumerator object that you can use to select individual query values. Don’t worry too much about how this works for now — you’ll see a description of the technique that LINQ uses in the “Creating a Simple from Query” section of the chapter. The “Using the var Keyword” section of Chapter 3 describes the var keyword in greater detail. The second line contains the from keyword and a variable used to hold the current enumerated value. For example, if you define an array like this one: String[] QueryString = { “One”, “Two”, “Three”, “Four”, “Five” }; Chapter 2: Creating Simple LINQ Queries StringValue will contain, in turn, the values One, Two, Three, Four, and Five.

You can already find support for LINQ in Microsoft’s new F# language and you’ll probably find it in use with C++ as well. LINQ will appear as part of other language packages in the future. com/ c/a/Application-Development/ Borland-Plans-to-Support-MSLINQ-in-Delphi-Platform/), and you can expect that other languages such as PHP will have it as well. aspx. 5. Consequently, you need Visual Studio 2008 to work with LINQ effectively. This book assumes that you have a copy of Visual Studio 2008 installed on your system.

Chapter 2: Creating Simple LINQ Queries Figure 2-1: Creating a from LINQ query displays the entire content of the data source. Using the debugger to see the simple query in action The debugger is your best friend when it comes to working with LINQ because you can use it to trace exactly what happens during a query. In some cases, you’ll want to use the debugger just to see how the query works to improve performance or to make the query easier to understand. Of course, you can also use the debugger to locate query errors.

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LINQ For Dummies (For Dummies (Computer Tech)) by John Paul Mueller

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