Download LINQ for visual C# 2005 by Fabio Claudio Ferracchiati PDF

By Fabio Claudio Ferracchiati

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Concat This operator concatenates two sequences. public static IEnumerable Concat( this IEnumerable first, IEnumerable second); The resulting IEnumerable type is the concatenation of the first and second sequences specified as a parameter. In Listing 1-34 two numeric sequences are concatenated. Listing 1-34. Write(query); Starting from the numbers sequence the Concat method appends the moreNumbers sequence (see Figure 1-23). Figure 1-23. The output of Listing 1-34 firstPress: LINQ to Objects 45 Element Operators There are nine element operators: First, FirstOrDefault, Last, LastOrDefault, Single, SingleOrDefault, ElementAt, ElementAtOrDefault, and DefaultIfEmpty.

Figure 1-20. The output for Listing 1-29 40 firstPress: LINQ to Objects Aggregate This operator allows us to define a function used during the aggregation of the elements of a sequence. public static T Aggregate( this IEnumerable source, Func func); public static U Aggregate( this IEnumerable source, U seed, Func func); The difference between those two prototypes stands in the seed parameter. When it is not specified the method uses the specified function to aggregate the elements of the sequence, assuming the first element as seed.

Public static IEnumerable Reverse( this IEnumerable source); When the code processes the query expression, the method enumerates the elements of the source sequence, collecting them in an IEnumerable type. Before the method returns the result it inverts the ordering of the elements in the sequence. Aggregate Operators There are seven aggregate operators: Count, LongCount, Sum, Min, Max , Average and Aggregate. Count and LongCount Those methods return the number of elements within a sequence.

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