LINQ: The Future of Data Access in C# 3.0 by Joe Hummel PDF

By Joe Hummel

Language built-in question (LINQ) is Microsoft's new expertise for strong, common goal info entry. This expertise offers a fully-integrated question language, on hand in either C# 3.0 and VB 9.0, for high-level information entry opposed to gadgets, relational databases, and XML records. during this brief lower you will know about LINQ and the proposed C# 3.0 extensions that aid it. you are going to additionally see how one can use LINQ and C# to complete a number of projects, from querying gadgets to having access to relational facts and XML. better of all, you could try the examples and run your personal code utilizing the newest LINQ CTP, to be had loose from Microsoft. This brief reduce encompasses a entire connection with the traditional LINQ question operators.

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Extra resources for LINQ: The Future of Data Access in C# 3.0

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Any(); See also: All, Contains, and EqualAll. 4. Average The Average operator computes the average of a sequence of numeric values. The values are either the sequence itself, or selected out of a sequence of objects. Average(); decimal? , double, or double?. , respectively. See also: Aggregate, Count, LongCount, Max, Min, and Sum. 5. Cast The Cast operator yields the elements of a sequence type-casted to a given type T. 0 collections (such as ArrayLists) for use with LINQ. TimeWritten descending select entry; See also: OfType.

Yields a sequence of integers in a given range. Yields a sequence of values by repeating a given value n times. Reverses the elements of a sequence. 33 Select SelectMany Single SingleOrDefault Skip SkipWhile Sum Take TakeWhile ThenBy TheyByDescending ToArray ToDictionary ToList ToLookup ToSequence Yes Applies a projection function to a sequence, yielding a new sequence. Yes Applies a projection function to flatten a sequence of sequences. No Returns the lone element of a singleton sequence. No Returns the lone element of a singleton sequence, or default if sequence is empty.

See also: ElementAt. 13. Empty The Empty operator yields an empty sequence of the given type. WriteLine(doc); // This operator is helpful when you need an empty sequence for another operator or a method argument. See also: Range and Repeat. 14. EqualAll The EqualAll operator compares two sequences for equality. Two sequences are equal if they are of the same length, and contain the same sequence of elements. EqualAll(query2); The sequences may contain elements of any type T. g. EqualAll(objects2); // false The result in such cases is false.

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