How to get object size in memory

Question

I need to know how much bytes my object consumes in memory  in C    for example how much my Hashtable  or SortedList  or List lt String gt

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Unmanaged object    Marshal SizeOf object yourObj     Value Types    sizeof object val    Managed object    Looks like there is no direct way to get for managed objects  Ref   https   devblogs microsoft com cbrumme size-of-a-managed-object

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In debug mode  load SOS  and execute dumpheap command

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I don t think you can get it directly  but there are a few ways to find it indirectly    One way is to use the GC GetTotalMemory method to measure the amount of memory used before and after creating your object  This won t be perfect  but as long as you control the rest of the application you may get the information you are interested in    Apart from that you can use a profiler to get the information or you could use the profiling api to get the information in code  But that won t be easy to use I think   See Find out how much memory is being used by an object in C   for a similar question

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this may not be accurate but its close enough for me  long size   0  object o   new object    using  Stream s   new MemoryStream          BinaryFormatter formatter   new BinaryFormatter        formatter Serialize s  o       size   s Length

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The following code fragment should return the size in bytes of any object passed to it  so long as it can be serialized  I got this from a colleague at Quixant to resolve a problem of writing to SRAM on a gaming platform  Hope it helps out  Credit and thanks to Carlo Vittuci        lt summary gt      Calculates the lenght in bytes of an object      and returns the size       lt  summary gt       lt param name  TestObject  gt  lt  param gt       lt returns gt  lt  returns gt  private int GetObjectSize object TestObject        BinaryFormatter bf   new BinaryFormatter        MemoryStream ms   new MemoryStream        byte   Array      bf Serialize ms  TestObject       Array   ms ToArray        return Array Length

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OK  this question has been answered and answer accepted but someone asked me to put my answer so there you go   First of all  it is not possible to say for sure  It is an internal implementation detail and not documented  However  based on the objects included in the other object  Now  how do we calculate the memory requirement for our cached objects   I had previously touched this subject in this article      Now  how do we calculate the memory requirement for our cached   objects  Well  as most of you would know  Int32 and float are four   bytes  double and DateTime 8 bytes  char is actually two bytes  not   one byte   and so on  String is a bit more complex  2  n 1   where n   is the length of the string  For objects  it will depend on their   members  just sum up the memory requirement of all its members    remembering all object references are simply 4 byte pointers on a 32   bit box  Now  this is actually not quite true  we have not taken care   of the overhead of each object in the heap  I am not sure if you need   to be concerned about this  but I suppose  if you will be using lots   of small objects  you would have to take the overhead into   consideration  Each heap object costs as much as its primitive types    plus four bytes for object references  on a 32 bit machine  although   BizTalk runs 32 bit on 64 bit machines as well   plus 4 bytes for the   type object pointer  and I think 4 bytes for the sync block index  Why   is this additional overhead important  Well  let   s imagine we have a   class with two Int32 members  in this case  the memory requirement is   16 bytes and not 8

[c#] How to get object size in memory?

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