How to retrieve an object's address?

This is a discussion on How to retrieve an object's address? within the C# Programming forums, part of the General Programming Boards category; Hi, is there a way to retrieve the address of an object? (Or some id that is unique to the ...

  1. #1
    Registered User
    Join Date
    Aug 2001

    How to retrieve an object's address?


    is there a way to retrieve the address of an object? (Or some id that is unique to the object)

    I want to define the identity of an Edge based on the addresses of the Nodes it refers to.
    But because GetHashCode doesnt guarantee uniqueness, this solution is unsafe:

       public int CompareTo(Edge other)
     	            int result = from.GetHashCode() - other.from.GetHashCode();
                    if(result != 0)
                        return result;
                    return to.GetHashCode() -;
    signature under construction

  2. #2
    Registered User
    Join Date
    Apr 2008


    MSDN online or MSDN Express Edition.

    There are two ways of getting an id for and object and the hash method is a generic method and the one that I had seen most frequently used. There is another that is quite similar to the methods utilized in C++ to get an objects signature, but I can't recall the way of going about to get it. I have seen references to the method in the MSDN Express edition and I personally recommend getting it (MSDN Express Ed.) if you do not have it already.

    A couple possible leads that might get you started are: comparing objects through equality, dynamically creating and/or destroying objects, and look up .Net assembly files and IL Dasm to access your assemblies to search for object ID references.

    A really good book I am reading right now that addresses these types of Intermediate to Advanced Professional Programming level topics is Pro C# 2008, and the .Net 3.5 Platform published by Apress Books. Excellent author and seriously deep treatment of C# and the .Net Framework from a hacker oriented/reverse engineering point of view geared toward getting a certification.
    Last edited by TheRaven; 04-29-2008 at 11:22 PM.

  3. #3
    Cat is offline
    Registered User
    Join Date
    May 2003
    I had this exact problem once.

    The short answer is you can but it wouldn't work. C# allows objects to be moved around in memory, so the same actual object might occupy different memory locations at different times.

    My own method was to simply count nodes:

    public class Node {
          private static int mCount = 0;
          private int ID;
          public Node()
                ID = Interlocked.Increment(mCount);
    The Interlocked.Increment in place of just "++mCount" is for thread safety.

    This one obviously doesn't reuse old IDs, and it has a hard limit of 2^32 possible ID values before you wrap all the way back to ID #1 again. That wasn't an issue for me, maybe it won't matter for you either.
    You ever try a pink golf ball, Wally? Why, the wind shear on a pink ball alone can take the head clean off a 90 pound midget at 300 yards.

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