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C# out of scope objects not getting collected


By : Nextlevel Fiji
Date : September 15 2020, 07:00 PM
it helps some times C# is not C++. Destuctors, or rather finalizers, are a feature for very specific purposes, namely for handling the disposal of unmanaged resources held by your objects. Stuffing program logic into finalizers is one of the few very bad ideas you can have with C#. Why? Here's a quick rundown:
There is no guarantee on when an object will be collected when it goes out of scope. Heck, there is no guarantee that a collection ever occurs if there's no memory pressure. There's no guarantee on the ordering in which object finalizer's run. There's no guarantee on when an object finalizer runs - could be right after it goes out of scope, could be a minute later. Heck, there is no guarantee a finalizer ever runs. There's no guarantee that, if it runs, it runs after your ctor completed. So in your case you could end up decrementing the instance count without incrementing it. Granted, this is unlikely to actually happen, but it just might. Oh, it also negatively affects the performance of your entire app, but that's pretty minor compared to the evilness above.
code :
GC.Collect();
GC.WaitForPendingFinalizers();


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Is it possible to write C# so that objects are garbage collected when they fall out of scope?


By : Israel Ramos
Date : March 29 2020, 07:55 AM
I wish did fix the issue. No. In fact, you don't really want it to be garbage collected - prompting the garbage collector very frequently will reduce performance.
What you do want is to dispose of the unmanaged resources in a timely manner - and that's where IDisposable comes in, along with the using statement:
code :
void MyFunction()
{
    using (Bitmap image = RetrieveImage())
    {
        DoSomething(image);
    }
}
void DoSomething(Bitmap image)
{
    // Code here
}
...
DoSomething(RetrieveImage());
void DoSomething(Func<Bitmap> imageProvider)
{
    using (Bitmap image = imageProvider())
    {
        // Code here
    }
}
...
DoSomething(() => RetrieveImage());
public void ApplyToEachLineInFile(string file, Action<string> action)
{
    using (TextReader reader = File.OpenText(file))
    {
        string line;
        while ((line = reader.ReadLine()) != null)
        {
            action(line);
        }
    }
}

C# creating a Class, having objects as member variables? I think the objects are garbage collected?


By : Davy
Date : March 29 2020, 07:55 AM
With these it helps So I have a class that has the following member variables. I have get and set functions for every piece of data in this class. , In C#, don't build get and set functions like that. Use a property:
code :
public float X
{
   get {Console.WriteLine(node.X); return X;}
}

public bool IsWall {get;set;}

Does an ExecutorService get garbage collected when out of scope?


By : miden
Date : March 29 2020, 07:55 AM
it fixes the issue
Does the ExecutorService service go out of scope and get garbage collected once BaseConsumer.accept() has finished?

Why is AsyncTask not garbage collected if reference is out of scope?


By : clmstr
Date : March 29 2020, 07:55 AM
I wish did fix the issue.
One of my guesses is that it creates a thread and that thread has a reference to the object. As soon as the thread dies, the AsyncTask is also garbage collected.

Are local objects garbage-collected once they fall out of scope?


By : jkyger
Date : March 29 2020, 07:55 AM
seems to work fine Yes, as long as DoStuff() doesn't do any operation that would increase the reference counter of o, it's reference count will be come 0 and it's resources will be freed at that time.
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