A good way to estimate/calculate object size in memory

Question

Lets say I have object Tom which has class Person.

Class Person

String Name
DateTime BirthDate
String Role
Int32 Salary

Can you give me an approximation of its memory size if it has the following values:

Name = Tom. BirthDate = 1/1/1990. Role = User. Salary = 30000

Could you also give me some insight into how the calculation was done?

See [Find out the size of a .net object](http://stackoverflow.com/questions/324053/find-out-the-size-of-a-net-object) — Michael Petrotta, Sep 28 '10 at 21:59

score 2 · Accepted Answer · answered Sep 28 '10 at 22:01

To get a true figure, use the CLR profiler. To do it programmatically, use sizeof (only works on value types). You could also do it by referencing the GC directly like this...

long StopBytes = 0;
foo myFoo;

long StartBytes = System.GC.GetTotalMemory(true);
myFoo = new foo();
StopBytes = System.GC.GetTotalMemory(true);
GC.KeepAlive(myFoo); // This ensure a reference to object keeps object in memory

long TotalBytes = StopBytes - StartBytes;
MessageBox.Show("Size is " + TotalBytes.ToString());

A good way to estimate/calculate object size in memory

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