Pass type to generic method (nested generic)

Question

How can I invoke following method while I have not TRootEntity, but have just its TYPE:

public void Class<TRootEntity>(Action<IClassMapper<TRootEntity>> customizeAction) where TRootEntity : class;

final goal is to run following code

var mapper = new ModelMapper();
mapper.Class<MyClass>(ca =>
{
    ca.Id(x => x.Id, map =>
    {
        map.Column("MyClassId");
        map.Generator(Generators.HighLow, gmap => gmap.Params(new { max_low = 100 }));
    });
    ca.Property(x => x.Something, map => map.Length(150));
});

It is used to create dynamic NHibernate HBM. More info available here

As related question see here and here.

Chivalry

possible duplicate of How to use reflection to call generic Method? – Aloisia

Answer 1

You cannot code Generic methods to run by passing a runtime Type.

Generics need to have the type at compile time.

You may need to use reflection (see answer of mr. Ferreira that point on how to do that).

Fragmentation

+1. It is important to remember that generics are extrapolated at compile time. – Canst

Please see my update. I have added 2 related questions that shows it is possible at least in certain situations. – Chivalry

both of those related question are solved using reflection. That does not have to work after you compile and surely won't work as fast as a pure generic implementation. Take this for example: obj.GetType().GetMethod("Find<>").MakeGenericMethod(type).Invoke() - if you send a type that does not adhere to the generic constrains this will compile and fail at runtime. – Fimble

Answer 2

Have a look at this answer from the great Jon Skeet. You should be able to adapt it to your needs.

Fetation