By Joseph Rattz, Dennis Hayes
ISBN-10: 1430216441
ISBN-13: 9781430216445
Since its unlock in November 2007 Language built-in question (LINQ) has turn into an rapid luck among the .NET programming neighborhood. Its skill to permit programmers to engage with their databases in the same 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 expense and – as a part of Microsoft’s middle structure – will remain followed good into the future.
This e-book is a translation of Apress’ market-leading ‘Pro LINQ in C# 2008’ that's being produced in particular for the visible uncomplicated (VB) programming neighborhood. it's not an immediate reproduction of the C# version, yet has been adapted to the VB language and covers performance that differs, or used to be now not to be had, to the C# programmer. This makes it certain during this industry position. it really is being revised through Joseph C. Rattz, Jr., the writer of the C# version, with the help of Dennis Hayes, a visible uncomplicated specialist.
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Extra resources for Pro LINQ: Language Integrated Query in VB 2008
Sample text
First, it made it easier to write programs. Second, it made it easier to make mistakes. NET. I was told the VB6 program worked well, except for a couple of glitches, including one function that, for reasons no one had been able to figure out, did not work at all. The programmer “always” declared his variables and gave them types but did not always set Klpekj Atlhe_ep Kj on every form. kii]j` was undefined and would be upgraded as an object. kii]j` ' Beah`I had to look at the code for several minutes before seeing what was wrong; someone had used a g instead of a q, setting the command section of the string to blank.
NET developers now have a way to explicitly state that a collection can only contain elements of a specified type. ]op requires that every object in the collection be of the correct type. ]op operator, if any object is unable to be cast to the specified data type, an exception is thrown. If there is any legitimate possibility that objects of differing types exist in the collection, use the KbPula operator. With it, only objects of the specified type will be stored in the output EAjqian]^ha$Kb P% sequence, and no exception will be thrown.
The second Sdana operator is declared to accept an expression tree (Atlnaooekj), so the compiler will generate an expression tree data representation of the lambda expression. The operators that accept an EAjqian]^ha$Kb P% sequence as their first argument are declared to accept a @ahac]pa for their lambda expressions. The operators that accept an EMqanu]^ha$Kb P% sequence as their first argument are declared to accept an expression tree. NNote Extension methods on EAjqian]^ha$Kb P% sequences have IL code emitted by the compiler.
Pro LINQ: Language Integrated Query in VB 2008 by Joseph Rattz, Dennis Hayes
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