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// Create a query expression.

var fastCars = from c in myCars where

c.Speed > 90 && c.Make == "BMW" select c;

In this case, the only pet name printed out is “Henry”.

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Source Code

The LinqOverCustomObjects project can be found under the Chapter 14 subdirectory.

LINQ and Nongeneric Collections

Recall that the query operators of LINQ are designed to work with any type implementing

IEnumerable (either directly or via extension methods). Given that System.Array has been

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provided with such necessary infrastructure, it may surprise you that the legacy (nongeneric) con-

tainers within System.Collections have not. Thankfully, it is still possible to iterate over data

contained within nongeneric collections using the generic Enumerable.OfType() method.

The OfType() method is one of the few members of Enumerable that does not extend generic

types. When calling this member off a nongeneric container implementing the IEnumerable

interface (such as the ArrayList), simply specify the type of item within the container to extract

a compatible IEnumerable object. Assume we have a new Console Application named

LinqOverArrayList that defines the following Main() method (note that we are making use of the

previously defined Car type and be sure to import the System.Collections namespace).

static void Main(string[] args)

{

Console.WriteLine("***** LINQ over ArrayList *****\n");