get size of DataTable or ArrayList in memory

Question

There is some articles about How to get object size in memory ? but they does not explain how to get the size of an object in memory.

when I use:

System.Runtime.InteropServices.Marshal.SizeOf(arrayListObject)

i get error:

Type 'System.Collections.ArrayList' cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed.

I also can not get the amount of all free memory, becouse i want to perform this calculation on web applications with a lot of threads, so a need to know exactly how much memory needs specific object.

Unless you're still stuck at .NET 1.1, you should not use ArrayList. Use List<object> if you need a list containing any object. — John Saunders
– John Saunders, Commented Mar 4, 2010 at 12:03
Question is not about the way to use objects, For now I'm working with DataTable — Alexei.Ozon
– Alexei.Ozon, Commented Mar 9, 2010 at 5:19

Oded · Accepted Answer · 2010-03-04 11:50:18Z

2

You want to find out the size in memory of managed objects in code - according to this blog entry, it is not possible.

You need to use a memory profiler to do this (like the Ants profiler).

answered Mar 4, 2010 at 11:50

Oded

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1 Comment

Alexei.Ozon Over a year ago

I dont want to use profiler, i need to know the size to fire an alert/event or something

Matthias · Accepted Answer · 2010-03-04 11:48:01Z

1

If you want to know this because of possible optimizations: Use a memory profiler.

answered Mar 4, 2010 at 11:48

Matthias

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Alexei.Ozon Over a year ago

no, i don't want to know it for optimization, I want to know when my DataTable grows to much, to fire an event...

thepirat000 · Accepted Answer · 2013-07-18 18:27:10Z

1

And what about serializing the DataTable, and then checking its length?

System.Runtime.Serialization.IFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
System.IO.MemoryStream stream = new System.IO.MemoryStream();
formatter.Serialize(stream, YourDataTable);
long length = stream.Length;

answered Jul 18, 2013 at 18:27

thepirat000

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