In C# how can i check if T is of type IInterface and cast to that if my object supports that interface?

Question

In C#, I have a function that passes in T using generics and I want to run a check to see if T is an object that implements a

Answer 1

The missing piece is Cast<>():

if(typeof(IFilterable).IsAssignableFrom(typeof(T))) {
    entities = FilterMe(entities.Cast()).AsQueryable().Cast();
}

Note the use of Cast<>() to convert the entities list to the correct subtype. This cast would fail unless T implements IFilterable, but since we already checked that, we know that it will.