New PDF release: LINQ for Visual C# 2008

By Fabio Claudio Ferracchiati

ISBN-10: 1430215801

ISBN-13: 9781430215806

Each C# programmer must know about LINQ (Language-lIntegrated Query), Microsoft's step forward know-how for simplifying and unifying info entry from any info resource. With LINQ you could write extra stylish and versatile code not only to entry databases and records yet to govern facts constructions and XML.This e-book is a quick but accomplished advisor to the foremost positive factors of LINQ and the numerous improvements brought with .NET 3.5. there isn't any larger resource for buying a head-start at the way forward for those applied sciences than this publication.

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The output for Listing 1-27 Min and Max The Min() and Max() methods return the minimum and the maximum element within a sequence, respectively. public static Numeric Min( this IEnumerable source); public static T Min( this IEnumerable source); public static Numeric Min( this IEnumerable source, Func selector); public static S Min( this IEnumerable source, Func selector); public static Numeric Max( this IEnumerable source); LINQ for Visual C# 2008 45 public static T Max( this IEnumerable source); public static Numeric Max( this IEnumerable source, Func selector); public static S Max( this IEnumerable source, Func selector); When the code processes the query expression, the Min and Max operators enumerate the source sequence and call the selector for each element, finding the minimum and maximum.

Type when the Numeric type is int and long or int? , respectively. When the Numeric type assumes other types, those will be returned as is. When the average is computed, if the sum of the elements is too large to be contained in the Numeric type an overflow exception will be thrown. Listing 1-29 shows the operator in action. Listing 1-29. Average()); 48 LINQ for Visual C# 2008 From the query expression we retrieve the salaries for the person that has the identifier equal to 1 and then we apply the Average method to the result.

LastName, RoleDescription = r == null ? Write(query); In the code snippet in Listing 1-19 the join … into query expression is used to group the join into a new sequence called pr. Since the new element we introduced in the people sequence has a role identifier that doesn’t correspond to any of Role elements in the roles sequence, an empty element is returned. Using the DefaultIfEmpty method, we can replace each empty element with the given ones. In this case no parameter has been provided, so the empty element will be replaced with a null value.

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LINQ for Visual C# 2008 by Fabio Claudio Ferracchiati


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