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// Here is a nongeneric collection of cars



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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

// Here is a nongeneric collection of cars.

ArrayList myCars = new ArrayList() {

new Car{ PetName = "Henry", Color = "Silver", Speed = 100, Make = "BMW"},

new Car{ PetName = "Daisy", Color = "Tan", Speed = 90, Make = "BMW"},

new Car{ PetName = "Mary", Color = "Black", Speed = 55, Make = "VW"},

new Car{ PetName = "Clunker", Color = "Rust", Speed = 5, Make = "Yugo"},

new Car{ PetName = "Melvin", Color = "White", Speed = 43, Make = "Ford"}

};

// Transform ArrayList into an IEnumerable-compatible type.

IEnumerable myCarsEnum = myCars.OfType();

// Create a query expression.

var fastCars = from c in myCarsEnum where c.Speed > 55 select c;

foreach (var car in fastCars)

{

Console.WriteLine("{0} is going too fast!", car.PetName);



}

}

Filtering Data Using OfType()

As you know, nongeneric types are capable of containing any combination of items, as the mem-

bers of these containers (again, such as the ArrayList) are prototyped to receive System.Objects.

For example, assume an ArrayList contains a variety of items, only a subset of which are numerical.

If we want to obtain a subset that contains only numerical data, we can do so using OfType(),

since it filters out each element whose type is different from the given type during the iterations:


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