使用弱引用字典跟踪 c# GC 对象（以避免 memory 泄漏）是个好主意吗？

Question

I have implemented a static class with a dictionary that tracks some objects in my application using weak references.

static Dictionary<Type,List<WeakReference>> Monitor;

On request (not in production) the garbage collector is forced and the dictionary is returned. By checking the number of "Alive" objects for each type, I can quickly check if I have a memory leak because the number of alive objects is higher than expected. Given the simplicity and usefulness of this class made by me, I was wondering if there is something better in the dot net framework to keep track of certain objects, let's call them "observable".

Each contribution is highly appreciated.

Answer 1

Assuming that you do not want to use a profiler, then your approach can work. But be aware that your solution itself presents a memory leak as any object you add to it will have a weakreference object present, even after the object has been collected. You need to periodically remove the weakreferences that are no longer valid, one approach is to remove on add like shown here https://www.chriswirz.com/software/weak-reference-lists-in-c-sharp . Also remember that you are not using a ConcurrentDictionary so you need to control access to that structure.

If you are okay with spawning another process, you might have success in using the profiling api. https://docs.microsoft.com/en-us/dotnet/framework/unmanaged-api/profiling/profiling-overview

You could spawn a process that attaches to the host, collects data and signals back with the results.