抽象类继承的泛型接口的实例化问题

interface IConnect<T>
    {
        T dbConnection(String dbConnectionString);
    }

我的抽象类是:

  abstract class SqliteConnect :Iconnect<SQLiteConnection>
    {
        public abstract SQLiteConnection dbConnection(String dbConnectionString);
    }

  class SQLiteSpecialConnect:SqliteConnect
    {
        public override SQLiteConnection dbConnection(String fileToConnect)
        {
            return new SQLiteConnection("Data Source=" + fileToConnect);
        }
    }

但是当我尝试实例化它时,我得到

Iconnect<SQLiteConnection> sqliteConObj= new SQLiteSpecialConnect().dbConnection("SomeConnectionString");  

cannot implicitly convert type System.Data.SQLite.SQLiteConnection to Iconnect<System.Data.SQLite.SQLiteConnection>