By Joseph Rattz, Dennis Hayes
Since its unlock in November 2007 Language built-in question (LINQ) has turn into an quick luck among the .NET programming group. Its skill to permit programmers to have interaction with their databases in an identical demeanour to that with which they have interaction with their code has simplified architectures, speeded improvement, and elevated productiveness. it really is being followed at a quick fee and – as a part of Microsoft’s center structure – will stay followed good into the future.
This booklet is a translation of Apress’ market-leading ‘Pro LINQ in C# 2008’ that's being produced particularly for the visible uncomplicated (VB) programming group. it isn't an immediate reproduction of the C# variation, yet has been adapted to the VB language and covers performance that differs, or used to be no longer to be had, to the C# programmer. This makes it exact during this marketplace position. it's being revised via Joseph C. Rattz, Jr., the writer of the C# variation, with the help of Dennis Hayes, a visible easy specialist.
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Seeing that its unlock in November 2007 Language built-in question (LINQ) has turn into an quick good fortune among the . internet programming neighborhood. Its skill to permit programmers to engage with their databases in an analogous demeanour to that with which they have interaction with their code has simplified architectures, speeded improvement, and elevated productiveness.
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NNote Don’t forget that Visual Studio stores default values for these options in your project’s properties. Select your project’s Properties menu and examine the Compile tab. There you will see the project’s default settings for each of these options. It is important to know how these are set before trying any of the code in this section. Option Explicit In VB6, by default, you did not have to declare a variable or give it a type before you used it. The following code was completely legal and would compile and run: =9dahhksknh` Because = has never been declared, VB6 would declare it on the fly.
It decouples the entity object model from the physical database by injecting a logical mapping between the two. With this decoupling comes increased power and flexibility, as well as complexity. Because LINQ to Entities appears to be outside the core LINQ framework, it is not covered in this book. However, if you find that you need more flexibility than LINQ to SQL permits, it would be worth considering as an alternative. Specifically, if you need looser coupling between your entity object model and database, entity objects composed of data coming from multiple tables, or more flexibility in modeling your entity objects, LINQ to Entities may be your answer.
1 Check out that sdana clause. Did you notice that I used the Aj`oSepd method of a Opnejc object? You may be wondering why, with KlpekjOpne_pKj, an error was not generated when I declared epaio without a type or when I used epai as a variable in the BknA]_d loop without giving it a type. NET with KlpekjAtlhe_ep and KlpekjOpne_p set to Kbb, declaring a variable without giving it a type may not seem like a big deal. But with KlpekjOpne_pKj, it is. Explaining why we do not get a compilation error from this would be a distraction right now, but I will pick up this idea again at the start of Chapter 2.
Pro LINQ: Language Integrated Query in VB 2008 by Joseph Rattz, Dennis Hayes