How Can I Measure the Memory Consumption of Objects in C#?

Calculating Memory Usage of C# Objects

This article explains how to estimate the memory used by objects in C#, such as Hashtables, SortedLists, and Lists. Precise measurement is difficult, but we can obtain a close approximation.

Approximating Memory Size

The following method offers a reasonable estimate of an object's memory footprint:

<code class="language-csharp">long size = 0;
object o = new object();
using (var s = new MemoryStream())
{
    var formatter = new BinaryFormatter();
    formatter.Serialize(s, o);
    size = s.Length;
}</code>

This code serializes the object to a byte stream using BinaryFormatter. The stream's length serves as a proxy for the object's memory size. Serialization captures the object's data and structure, closely mirroring its in-memory representation.

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