C# not releasing memory after task complete

The garbage collector only frees locations in memory that are no longer in use that are objects which have no pointer pointing to them.

(1) your program runs infinitely without termination and

(2) you never change the pointer to your dictionary, so the GC has certainly no reason to touch the dictionary.

So for me your program is doing exactly what it is supposed to do.

The memory is not being released because the scope aMassiveList is never finished. When a function returns, it releases all non-referenced resources created inside it.

In your case, aMassiveList never leaves context. If you want your function never to return you have to find a way to 'process' your info and release it instead of storing all of them forever.

If you create a function that increasingly allocates resources and never release it you will end up consuming all the memory.

GC will only release unreferenced objects, so as the dictionary is being referenced by your program it can't be released by the GC