C# Abstraction/Reflection and DbSet

I am setting up a Net Core page that uses several DbSets as a hook for a set of SQL tables (each table has a unique class name). Each class inherits from a general class I wrote - when the class is instantiated, only variables inside the general class are set - the derived classes are mainly for structure and are used later. Please see the example code below:

public class GeneralSet
{
   [Key]
   public Guid Id {get; set;}
   public string set { get; set; }
   public string userID { get; set; }
}

public class SpecificSetOne : GeneralSet
{
    public SpecificSetOne(string _set, string _userID) : base(_set, _userID)
    {
    }
    public string otherVariableUsedLater {get; set;}
}

public class SpecificSetTwo : GeneralSet
{
    public SpecificSetTwo(string _set, string _userID) : base(_set, _userID)
    {
    }
    public string otherVariableUsedLaterWithDifferentName {get; set;}
}

I have my DbContext set up as follows:

public class SetDbContext : DbContext
{
   public SetDbContext(DbContextOptions<SetDbContext> options) :
      base(options)
   {
   }

   public DbSet<SpecificSetOne> SetOneData { get; set; }
   public DbSet<SpecificSetTwo> SetTwoData { get; set; }
 }

My controllers see a string variable "set" sent via url.

I am currently writing a repository to control CRUD functionality for the tables. I am trying to contain it all within one repository and to call the appropriate CRUD functionality for a specific set based on which set string is passed in via that url. Is this possible in c#? I've been reviewing reflection but am not exactly sure if what I want is doable or advisable.

Thank you very much, hopefully this is somewhat clear.