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How do I filter a collection by type?

I have three classes:

public class class1 {}
public class class2 : class1 {}
public class class3 : class1 {}

and a list of items class1

, but I only want to get those that are of type class2

, something like:

list = list.where(x=>x.classType == class2)

how to do it correctly?

Thank!

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2 answers


You probably want OfType<T>()

: -

var newList = list.OfType<Class2>().ToList();


Also, it has the added benefit of being newList

type List<Class2>

(rather than like List<Class1>

, which only contains instances Class2

), which allows you to dump you further down the line.

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You want to use a method GetType()

and typeof()

:

list = list.Where(x => x.GetType() == typeof(class2)).ToList();


Or you can use is

:

list = list.Where(x => x is class2).ToList();
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