Sophia1, welcome to FlyerTalk.
I don't believe that there is any way to directly transfer points from a Canadian based DC account to Aeroplan.
There are a couple of indirect ways to do it, but the conversion rate is not great.
The best indirect transfer that I am aware of is through the SPG program;
20,250 DC Points converts to 6,750 SPG points, which then become 6,750 AP miles.
Others may be aware of better options.