Question

Given:

public T Get<T>() { ... }

where T is closed to IEnumerable<XYZ>, how can I determine the XYZ type?

I have no variable to start with.

Answer 1

You can use the TypeSystem.GetElementType Method from LINQ: Building an IQueryable Provider – Part I to get typeof(XYZ) when given typeof(IEnumerable<XYZ>):

var elementType = TypeSystem.GetElementType(typeof(IEnumerable<XYZ>));
// elementType == typeof(XYZ)

In your method, you can use typeof(T) to get the Type object that represents T.

public T Get<T>()
{
    var elementType = TypeSystem.GetElementType(typeof(T));
    ...
}