Question

How can I make a reference to a TYPE so I can use myreference name subsequently… In its easiest form…

MyInt — derived from int

Then, elsewhere, I would refer to MyInt. The kicker is that I need this “#define” respective within a class definition that would be subclassed and could be a different type. The actual intent is

MyTypeSQLCmd = OleDbCommand
OR
MyTypeSQLCmd = SQLiteCommand

and my subclass would just refer to, and be able to create a new MyTypeSQLCmd();

— let me elaborate a bit more.

I have one class that connects to an OleDB type of database.
I have ANOTHER class that connect to a SQLite database.

I have ANOTHER class that will derive from EITHER of the above, but will have additional functions. So, instead of knowing which back-end I will connect to, I don’t want to have IFs all over the place like…

if(connectingToSQLite)
  MyCmd = new SQLiteCommand();
else
  MyCmd = new OleDbCommand();

since subsequently, the common methods available that I need are the same references, such as

MyCmd.Parameters.Add(…)

So, I can’t pre-declare the variable as one “type” or another such as

OleDbCommand MyCmd;
SQLiteCommand MyCmd;

I want just one instance, so I was hoping to get sort of an “aliased” type that would be accepted and allow to continue without compiler errors.

Answer 1

Aren’t you really looking for an interface, i.e. IDbCommand