LINQ - Different ways to Query an Arraylist

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An Arraylist is a non-generic collection object that does not implement IEnumerable<T> interface. To query such an object , you have two ways.

a) Use the Cast<T> operator:

The Cast operator converts a non-generic object to a generic object that implements IEnumerable<T> interface.

ArrayList machines = GetMachines();

var query = from machine in machines.Cast<Computer>()
where machine.Type = 1

b) Declare the type of variable to specify the type of object in the collection.

var query = from Computer s in machines

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LINQ - Different ways to Query an Arraylist (822 Views)