What is the Maximum Size that an Array can hold

Question

In C  2008  what is the Maximum Size that an Array can hold

User · Answer

Since Length is an int I d say Int MaxValue

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I think if you don t consider the VM  it is Integer MaxValue

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Per MSDN it is   By default  the maximum size of an Array is 2 gigabytes  GB     In a 64-bit environment  you can avoid the size restriction by setting the enabled attribute of the gcAllowVeryLargeObjects configuration element to true in the run-time environment    However  the array will still be limited to a total of 4 billion elements   Refer Here http   msdn microsoft com en-us library System Array v vs 110  aspx  Note  Here I am focusing on the actual length of array by assuming that we will have enough hardware RAM

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System Int32 MaxValue   Assuming you mean System Array  ie  any normally defined array  int    etc   This is the maximum number of values the array can hold  The size of each value is only limited by the amount of memory or virtual memory available to hold them   This limit is enforced because System Array uses an Int32 as it s indexer  hence only valid values for an Int32 can be used  On top of this  only positive values  ie   gt   0  may be used  This means the absolute maximum upper bound on the size of an array is the absolute maximum upper bound on values for an Int32  which is available in Int32 MaxValue and is equivalent to 2 31  or roughly 2 billion   On a completely different note  if you re worrying about this  it s likely you re using alot of data  either correctly or incorrectly  In this case  I d look into using a List lt T gt  instead of an array  so that you are only using as much memory as needed  Infact  I d recommend using a List lt T gt  or another of the generic collection types all the time  This means that only as much memory as you are actually using will be allocated  but you can use it like you would a normal array   The other collection of note is Dictionary lt int  T gt  which you can use like a normal array too  but will only be populated sparsely  For instance  in the following code  only one element will be created  instead of the 1000 that an array would create   Dictionary lt int  string gt  foo   new Dictionary lt int  string gt     foo 1000     Hello world    Console WriteLine foo 1000      Using Dictionary also lets you control the type of the indexer  and allows you to use negative values  For the absolute maximal sized sparse array you could use a Dictionary lt ulong  T gt   which will provide more potential elements than you could possible think about

User · Answer

I think it is linked with your RAM  or probably virtual memory  space and for the absolute maximum constrained to your OS version  e g  32 bit or 64 bit

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This answer is about  NET 4 5  According to MSDN  the index for array of bytes cannot be greater than 2147483591  For  NET prior to 4 5 it also was a memory limit for an array  In  NET 4 5 this maximum is the same  but for other types it can be up to 2146435071   This is the code for illustration       static void Main string   args                   -----------------------------------------------            Pre  NET 4 5 or gcAllowVeryLargeObjects unset         const int twoGig   2147483591     magic number from  NET          var type   typeof int               type to use         var size   Marshal SizeOf type      type size         var num   twoGig   size             max element count          var arr20   Array CreateInstance type  num           var arr21   new byte num               -----------------------------------------------             NET 4 5 with x64 and gcAllowVeryLargeObjects set         var arr451   new byte 2147483591           var arr452   Array CreateInstance typeof int   2146435071           var arr453   new byte 2146435071      another magic number          return

User · Answer

Here is an answer to your question that goes into detail  http   www velocityreviews com forums t372598-maximum-size-of-byte-array html  You may want to mention which version of  NET you are using and your memory size   You will be stuck to a 2G  for your application  limit though  so it depends on what is in your array

[c#] What is the Maximum Size that an Array can hold?

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