interface and generics C#

Question

I have a interface like this:

public interface IMyInterface<T> where T:class { long OS { get; set; } T App { get; set; } }

and another interface like this:

public interface IMyInterfaces { List<IMyInterface<T>> Subscribers { get; set; } //this line give me error }

I got error

if i define T, i lose my list that can store any type of IMyInterface — Mohammad Lashgarbolouk
– Mohammad Lashgarbolouk, Commented Jan 25, 2018 at 5:45

Titian Cernicova-Dragomir · Accepted Answer · 2018-01-25 05:22:51Z

4

You need to specify a concrete type or another generic parameter for T when you use IMyInterface<T>

public interface IMyInterfaces { List<IMyInterface<int>> Subscribers { get; set; } }

OR

public interface IMyInterfaces<TOther> { List<IMyInterface<TOther>> Subscribers { get; set; } }

Note I used TOther to stress that it is another generic parameter, different from the T in IMyInterface but you could use the same name (T) for TOther

answered Jan 25, 2018 at 5:22

Titian Cernicova-Dragomir

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3 Comments

Mohammad Lashgarbolouk Over a year ago

You mean there is no way to, i have a list of interface<T> that interface<T> may be any type?

Titian Cernicova-Dragomir Over a year ago

You could use IMyInterface<object>, and anything can be cast to object.

Titian Cernicova-Dragomir Over a year ago

Then no, you either make IMyInterfaces generic as well or you specify a concrete generic parameter for IMyInterface. There is no way to declare something with a free generic type parameter

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