how do you make a system like this ?

I wanted to have a system that load a resource from with a UID found in a dictionary;

I used a Enum as key and UID string as value.

then I wanted to see what is that resource Dictionary key that I used to get it's UID was.

should i give the resource it's Enum value (that was used to get it's UID) when I loaded it ?

note: English isn't my first language sorry if there was a mistake