Create instance of the class from base class

Question

I have DataAccess class which is derived from DataAccessor. DataAccessor class is the DB base class which I use in all all projects.

Instance method is the helper to create new instance of the DataAccess class. I would like to move Instance method to DataAccessor base class and create new insatnces of derived classes from base class. How to do that?

public class DataAccess : DataAccessor
{

    public static DataAccess Instance
    {
        get
        {
            return new DataAccess();
        }
    }
}

public abstract class DataAccessor 
{
}

Answer 1

public class Base<T> where T : new()
{
    public static T Instance
    {
        get { return new T(); }
    }
}

public class Derived : Base<Derived>
{
}

Answer 2

您是否考虑过抽象工厂模式 ？