在C＃中的字节查找对象实例的大小 [英] Find size of object instance in bytes in c#

问题描述

有关任意实例（对象的不同，组合物，单一对象等的集合）

For any arbitrary instance (collections of different objects, compositions, single objects, etc)

我怎么能确定其大小以字节为单位？

How can I determine its size in bytes?

（我目前得到的各种对象的集合，我试图确定它的聚集大小）

(I've currently got a collection of various objects and i'm trying to determine the aggregated size of it)

编辑：已经有人写对象的扩展方法，可以做到这一点？这会是pretty整齐海事组织。

Has someone written an extension method for Object that could do this? That'd be pretty neat imo.

推荐答案

首先，警告：接下来严格是丑陋的，无证黑客的境界。不要依赖这个工作 - 即使它现在为你的作品，它可能会停止工作，明天，任何或大或小的.NET更新

First of all, a warning: what follows is strictly in the realm of ugly, undocumented hacks. Do not rely on this working - even if it works for you now, it may stop working tomorrow, with any minor or major .NET update.

您可以使用这篇文章CLR内部 - 上次我检查，它仍然适用。这里是如何做到这一点（它通过类型句柄检索类型的内部基本实例大小字段）。

You can use the information in this article on CLR internals - last I checked, it was still applicable. Here's how this is done (it retrieves the internal "Basic Instance Size" field via TypeHandle of the type).

object obj = new List<int>(); // whatever you want to get the size of
RuntimeTypeHandle th = obj.GetType().TypeHandle;
int size = *(*(int**)&th + 1);
Console.WriteLine(size);

这适用于3.5 SP1 32位。我不知道如果字段大小，在64位是相同的 - 你可能有，如果他们不调整类型和/或偏移

This works on 3.5 SP1 32-bit. I'm not sure if field sizes are the same on 64-bit - you might have to adjust the types and/or offsets if they are not.

这将为所有正常的类型，所有实例都具有相同的，定义良好的工作类型。对于那些其这不是真的是肯定的数组和字符串，我相信也的StringBuilder 。对他们来说，你必须添加所有的大小，包含的元素，以它们的基础实例的大小。

This will work for all "normal" types, for which all instances have the same, well-defined types. Those for which this isn't true are arrays and strings for sure, and I believe also StringBuilder. For them you'll have add the size of all contained elements to their base instance size.

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