c# - Creating Subarray Without Copy and/or Allocation -


I am new to C #, and am wondering how to do the following:

I Create the array whose maximum number of elements I need to store: 

  int [] myArray = new int [64000];   
 I am passing this array in a third party API. In this API, they use the  .length  property to determine the number of elements. I do not want that because the array length is the maximum number, not the "active count" (i.e. the number of elements in use).  
 Keeping this in mind, create another array, whose size is equal to the active number? And, can it be done without copying and / or allocation? The memory I have allocated already is - what I want to do is that it indicates the sub-region of interest playing well with the third party API. 
 
 
 If the third party accepts a  int [] , then passing your data The only way to copy will be.  
 An API can be easily designed where it is not necessary (i.e.: pass the number of elements, or use  ArraySegment  , etc. ), But if the API

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