Question

Possible Duplicate:
how can i find out how many objects are created of a class in C#

Is it possible to get number of instances which is active(created and not yet destroyed) for selected class?

For example:

public class MyClass { }

...

var c1 = new MyClass();
var c2 = new MyClass();

count = GetActiveInstances(typeof(MyClass))

Should return 2. If GC destroy any of these classes then 1 or 0.

Answer 1

You can holds global static counter in your program.
This is a simple thread safe solution:

class MyClass
{
    static int counter = 0;

    public MyClass()
    {
        Interlocked.Increment(ref counter);
    }

    ~MyClass()
    {
        Interlocked.Decrement(ref counter);
    }
}

also take a look at the following similar question – Count number of objects of class type within class method