I was looking at the answer of this question regarding multiple generic types in one container and I can't really get it to work: the properties of the Metadata class are not visible, since the abstract class doesn't have them. Here is a slightly modified version of the code in the original question:

public abstract class Metadata
{
}

public class Metadata<T> : Metadata
{
    // ... some other meta data
    public T Function{ get; set; }
}

List<Metadata> metadataObjects;
metadataObjects.Add(new Metadata<Func<double,double>>());
metadataObjects.Add(new Metadata<Func<int,double>>());
metadataObjects.Add(new Metadata<Func<double,int>>());

foreach( Metadata md in metadataObjects)
{
      var tmp = md.Function; // <-- Error: does not contain a definition for Function
}

The exact error is:

error CS1061: 'Metadata' does not contain a definition for 'Function' and no extension method 'Function' accepting a first argument of type 'Metadata' could be found (are you missing a using directive or an assembly reference?)

I believe it's because the abstract class does not define the property Function, thus the whole effort is completely useless. Is there a way that we can get the properties?