.NET数组的最大大小 [英] Maximum size of .NET arrays

问题描述

这并不是说我会永远需要做到这一点，但我想了解它是如何工作/无法正常工作。我GOOGLE了相当多的数组的最大长度，并不能真正发现任何东西。

Not that I would ever need to do this, but I want to understand how it works/doesn't work. I googled quite a bit for the maximum length of an array and can't really find anything.

long[] hugeArray = new long[long.MaxValue];

//No exceptions
Console.WriteLine("Init");

//Overflow exception
Console.WriteLine(hugeArray.LongLength.ToString());

hugeArray = new long[int.MaxValue];

//OutOfMemoryException
Console.WriteLine( hugeArray.Length.ToString());

和我想跟进的问题是，如果有一个限制，我初始化之外的限制，为什么没有异常时，只有在使用创建？而这事编译器应该抓住？

And I guess a follow up question would be, if there is a limit and I am initializing outside that limit, why no exception when creating only when using? And is this something the compiler should catch?

推荐答案

据的 SpankyJ ，.NET 2.0至少有每个阵列2 GB的限制。 8个字节（sizeof的长）*〜2 ^ 31 = 16千兆字节（更不用说实际所需的内存）。至于溢出，我同意marcc这可能是因为数组预计将INT-索引（如见的这个方法虽然我有点不确定对此，作为的此重载利用了Int64的长度数组。这可能是一个只能在以后的版本中可用的扩展。

According to SpankyJ, .NET 2.0 at least had a limit of 2 GB per array. 8 bytes (sizeof long) * ~2^31 = 16 gigabytes (not to mention the actual memory required). As for the Overflow, I agree with marcc that is probably because arrays are expected to be int-indexed (see e.g. this method Though I'm a bit uncertain regarding this, as this overload takes an array of Int64 lengths. This may be an extension only available in later versions.

不过，总的来说，这主要是一个理论问题。其实任何人都靠这可能是做错了什么。

Overall, though, this is mostly a theoretical issue. Anyone actually relying on this is likely doing something wrong.

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