static object references needed to be collected in c#

Question

My Code is basicly like that:

Collecting frames from webcam on every 100ms in this method.

MutexControl.Image.WaitOne();
image = null; 
image = (Bitmap)eventArgs.Frame.Clone();

Bitmap Myimage = new Bitmap(Form1.image);
MutexControl.Image.ReleaseMutex();

image is My static reference. I use it in other parts of my program. is this make any problem with memory management. Does Garbage Collector collect my trash images?

You don't need to set it to null before setting it to something else. — John Saunders, Dec 15 '13 at 17:04
@John What happens to older objects of image? Garbage Collector will handle it? — freewave, Dec 15 '13 at 17:06
Yes, it will handle it just fine. For over a decade. The variable doesn't matter - only the objects matter. — John Saunders, Dec 15 '13 at 17:07
It collects them, eventually. Not usually quick enough to stop the memory usage of your program to blow through the roof. Disposing bitmaps is a pretty hard requirement. — Hans Passant, Dec 15 '13 at 17:30

score 1 · Accepted Answer · answered Dec 15 '13 at 17:08

1

The System.Drawing.Bitmap class implements IDisposable, so yes, you should be disposing it before reassigning the static field. If you don't dispose it, you may put excessive pressure on the finalizer thread and you will see increased memory usage.

answered Dec 15 '13 at 17:08

x0n

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Yes, memory usage incrasing time by time. But then suddenly it falls down to its starting point. When i used disposing with image object, sometimes i saw a SystemDrawing.dll exception. you can see in here : http://blog.lavablast.com/post/2007/11/The-Mysterious-Parameter-Is-Not-Valid-Exception.aspx mine is similar problem. When i used my image without dispose any kind of exception thrown by system. in link RKV ansvers it. – freewave Dec 15 '13 at 17:21
Yes, this is expected - it will grow and grow until the GC gets to all of the undisposed bitmap instances. If you dispose them, the GC will be able to reclaim the memory much faster. – x0n Dec 15 '13 at 17:37

static object references needed to be collected in c#

1 Answers1