Return the generic object, from a generic object

Question

public class ClassWithGeneric<T>
{
}

public class SecondClassWithGeneric<U>
{
    public void getNestedObject()
    {
        //How do I get the type of object T?
    }
}

public class TestProgram
{
   var nestedGenerics = new SecondClassWithGeneric<ClassWithGeneric<ObjectToLoad>>;  
}

public class ObjectToLoad
{
}

The question is how do I get the type of object T? in this case it would return "ObjectToLoad".

Incomplete. You don't specify a real connection between ClassWithGeneric and SecondClassWithGeneric. — Henk Holterman
– Henk Holterman, Commented Jul 16, 2014 at 19:09

Henk Holterman · Accepted Answer · 2014-07-16 19:10:29Z

3

Not very clear but probably:

public class SecondClassWithGeneric<U, T> 
         where U : ClassWithGeneric<T>   
{
    public T getNestedObject()
    {
        //How do I get the type of object T?
    }
}

or maybe

public class SecondClassWithGeneric<U, T> 
{
    public ClassWithGeneric<T> getNestedObject()
    {
        //How do I get the type of object T?
    }
}

answered Jul 16, 2014 at 19:10

Henk Holterman

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Comments

Selman Genç · Accepted Answer · 2014-07-16 19:18:52Z

0

This should give you the type ObjectToLoad but it's also highly prone to error.

public class SecondClassWithGeneric<U>
{
    public void getNestedObject()
    {
         var type = typeof(U).GetGenericArguments()[0];
    }
}

edited Jul 16, 2014 at 19:18

answered Jul 16, 2014 at 19:10

Selman Genç

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2 Comments

Jeppe Stig Nielsen Over a year ago

Right, but is that not one .GetGenericArguments()[0] too many?

Jeppe Stig Nielsen Over a year ago

Yes, one could start from typeof(SecondClassWithGeneric<U>), but it is easier to start typeof(U) like you do. Since .NET 4.5, there is also typeof(U).GenericTypeArguments[0]. In both cases one should check the length of the array before doing attempting to read the 0th entry.

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