CODEWITHSUNDEEP
c#reflectiontypes
Machinegon
Machinegon

Reputation: 1885

How to tell if a type inherits from another type not including any generic type parameters?

I have the following:

public interface IContract
{
     //...
}
public interface IContractChannel : IContract, IClientChannel 
{
    //....
}

public class myClient : System.ServiceModel.ClientBase<IContractChannel>
{
   ///...
}

I need to determine if my client is of type ClientBase at runtime. I'm trying 

 myClientType.IsSubClassOf(ClientBase<IClientChannel>);

it returns false. I don't have the IContractChannel type in hand. How can I know if my type inherits of ClientBase?

Upvotes: 0

Views: 133

Answers (3)

Matt
Matt

Reputation: 6050

ClientBase<IContractChannel> is not the same type as ClientBase<IClientChannel>, also IContractChannel inherits from IClientChannel, it doesn't mean ClientBase<IContractChannel> inherits from ClientBase<IClientChannel>. when the template class instantiates, they're different types.

So it should be false.

What you want to achieve, this is a term for this: Contravariance. In MSDN, there's a topic about this: Covariance and Contravariance in Generics. Contravariance enables you to use a more generic (less derived) type than originally specified, such as You can assign an instance of IEnumerable<Base> to a variable of type IEnumerable<Derived>.

In C#, you can create Variant Generic Interfaces to support Contravariance, but for you case, the generic interface is already there.

Upvotes: 2

Erik Philips
Erik Philips

Reputation: 54638

You are probably looking for is:

Console.WriteLine(myClientType.BaseType.GetGenericTypeDefinition() 
  == typeof(ClientBase<>));

DotNetFiddle Example.

Upvotes: 2

cadrell0
cadrell0

Reputation: 17327

You can either look at the type of the Channel myClient.Channel.GetType(), or you can look at myClientType.GenericTypeArguments to get the TChannel type, then check it.

Upvotes: 0

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