如何找出一个类创建了多少个对象 [英] How can I find out how many objects are created of a class

问题描述

如何在 C# 中找出为一个类创建了多少个对象?

How can I find out how many objects are created of a class in C#?

推荐答案

您必须在其中放置一个在构造时递增的静态计数器:

You'd have to put a static counter in that was incremented on construction:

public class Foo
{
    private static long instanceCount;

    public Foo()
    {
        // Increment in atomic and thread-safe manner
        Interlocked.Increment(ref instanceCount);
    }
}

一些注意事项:

• 这不计算当前在内存中实例的数量 - 这将涉及使用终结器来递减计数器；我不推荐
• 这不包括通过某些机制创建的实例，例如可能绕过构造函数的序列化
• 显然，这只有在您可以修改类时才有效；例如，您无法找出创建的 System.String 实例的数量 - 至少在不挂钩调试/分析 API 的情况下不会

• This doesn't count the number of currently in memory instances - that would involve having a finalizer to decrement the counter; I wouldn't recommend that
• This won't include instances created via some mechanisms like serialization which may bypass a constructor
• Obviously this only works if you can modify the class; you can't find out the number of instances of System.String created, for example - at least not without hooking into the debugging/profiling API

出于兴趣，您为什么需要这些信息?

Why do you want this information, out of interest?

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