大数组和OutOfMemory ERRor [英] large array and OutOfMemory ERRor

问题描述

你好

i想要：

char [,,] array3d = new char [1000,1000,1000];

但是：

抛出了'System.OutOfMemoryException'类型的异常。

我可以使用硬替换RAM吗？

对不起我的英语很差

请帮帮我..

谢谢...

解决方案

.NET中没有单个对象可以超过2GB ：这是绝对限制。并且数组是单个对象。

现在，1000个元素的3D数组似乎不会超过2GB - 它只有1,000,000,000个字符，不是吗？

但是...... char 是16位（因为它是unicode）所以在直接字符中只有2,000,000,000字节，加上3D的开销数组可能会获得支持各种维度。基本上，您可以使用 byte 值来实现，但 char 只需将其推到边缘。



你可以做一个锯齿状阵列：

  char  [] [] [] array3d =  new   char  [ 1000 ] [] []; 
  for （ int  x =  0 ; x <   1000 ; x ++）
 {
 array3d [x ] =  new   char  [ 1000 ] [ ]。 
  for （ int  y =  0 ; y <   1000 ; y ++）
 {
 array3d [x ] [y] =  new   char  [ 1000 ]; 
} 
} 

因为这不会创建一个巨大的对象。

但是会很慢！

hello
i want:
char[,,] array3d = new char[1000,1000,1000];
but:
Exception of type 'System.OutOfMemoryException' was thrown.
Do i can use of Hard replace RAM?
sorry My english language is poor
please help me..
thanks...

解决方案

No single object in .NET can exceed 2GB: that is an absolute limit. And an array is a single object.
Now, it might not seem that a 3D array of 1000 elements would exceed 2GB - it's only 1,000,000,000 characters, isn't it?
But... char is 16 bits (because it's unicode) so that's 2,000,000,000 bytes just in the direct chars, plus the overhead that a 3D array is likely to acquire to support the various dimensions. Basically, you could do it with byte values, but char just pushes it over the edge.

You could do it as a jagged array:

char[][][] array3d = new char[1000][][];
for (int x = 0; x < 1000; x++)
    {
    array3d[x] = new char[1000][];
    for (int y = 0; y < 1000; y++)
        {
        array3d[x][y] = new char[1000];
        }
    }

Because that doesn't create one single huge object.
Will be slow, though!

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