CODEWITHSUNDEEP
c#.net
Pure.Krome
Pure.Krome

Reputation: 87047

How to pass in a list of System.Type into a method?

I'm trying to pass in a list of System.Type into a method. Not instances but Type's.

Now there's a catch: I wish to restrict the Type by an interface.

For example, imagine i have this...

public interface IFoo
public class Cat : IFoo
public class Dog : IFoo

then this..

public void MyMethod(IEnumerable<Type> foos)

but only allow Cat's and Dog's and not anything else.

Usually, I do this:

public void MyMethod(IEnumerable<IFoo> foos)

but that is asking for some foo instances, which is not what I'm trying to do.

Upvotes: 2

Views: 86

Answers (3)

Eric Bowser
Eric Bowser

Reputation: 62

public static void MyMethod<T>(Type theType) where T : ICat {}

ICat icat = new Class2();

//This will not work because its the wrong type
IDog idog = new Class2();

MyMethod<ICat>(icat.GetType());

Upvotes: 0

Crowcoder
Crowcoder

Reputation: 11514

public void MyMethod<T>(T theType) where T : List<Cat>, List<Dog>

Upvotes: -1

Richard Schneider
Richard Schneider

Reputation: 35464

I assume that your method only wants a list of instances (objects) that implement IFoo. If so then use IEnumerable<IFoo>; as in:

public void MyMethod(IEnumerable<IFoo> foos) { ... }

Update

There is no way to declare that the method only accepts a list of Types that implement an interface. You need to do the validation in your own code.

if (!foos.Any(t => t.GetInterfaces().Contains(typeof(IFoo)))
   throw new ArgumentException(...);

Upvotes: 3

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