How Can I Determine the Size of an Object Instance in Bytes in C#?

Get object size (in bytes) in C#

How to determine the size (in bytes) of any object instance in C#? This is especially useful when you need to determine the aggregate size of various collections of objects.

Get object size

To get the size of an instance, you can use a series of undocumented tricks. Keep in mind that these methods are not guaranteed to always work and may change in future .NET updates.

Use TypeHandle

You can use the TypeHandle internal structure to access the "base instance size" field of a type. Here’s how:

<code class="language-csharp">object obj = new List<int>(); // 使用您需要的对象替换
RuntimeTypeHandle th = obj.GetType().TypeHandle;
int size = *(*(int**)&th + 1);
Console.WriteLine(size);</code>

This method will provide a base instance size for most common types. However, arrays, strings, and StringBuilder require additional calculations to account for the elements they contain.

Extension method considerations

While there are no known extension methods explicitly for determining object size in bytes, you can develop one yourself if desired.

The above is the detailed content of How Can I Determine the Size of an Object Instance in Bytes in C#?. For more information, please follow other related articles on the PHP Chinese website!