gistfile1.cs

interface IData  //データインターフェース
{
}

public abstract class SchemaBase//DBスキーマ抽象クラス
{
  public SchemaBase() { }
}

public abstract class DAOBase<TSchema, TData>//DAOパターン抽象クラス
  where TSchema : SchemaBase
  where TData : IData
{
  public DAOBase() { }
}

public abstract class ControlerBase<TDao, TSchema, TData>//データコントローラー抽象クラス
  where TDao : DAOBase<TSchema, TData>
  where TSchema : SchemaBase
  where TData : IData
{
}

class ControlerA<TDao, TSchema, TData> : ControlerBase<TDao, TSchema, TData>
  where TDao : DAOBase<TSchema, TData>
  where TSchema : SchemaBase
  where TData : IData,
{
}

class ControlerB<TDao, TSchema, TData> : ControlerBase<TDao, TSchema, TData>
  where TDao : DAOBase<TSchema, TData>
  where TSchema : SchemaBase
  where TData : IData
{
}

class Program
{
  static void Main(string[] args)
  {
    var a = new ControlerA<daoA, schemaA, dataA>();
    var b = new ControlerB<daoB, schemaB, dataB>();

    var list = new List<ControlerBase<DAOBase<SchemaBase, IData>, SchemaBase, IData>>();//←冗長過ぎてキモいよね！
    list.Add(a);
    list.Add(b);
  }
}