Select a section of a byte array

[Airslash]

Hello,

I'm currently working with byte arrays to hold data transmitted over the network, and i'm looking for a way to copy a section of that byte array and return it from a function result.

I know I can create a temporary array and call the CopyTo function to copy the data in that array, but I was wondering this this piece of code below with LinQ would do the same.

return (from m in Enumerable.Range(0, Size) select RawContent[64 + m]);

- RawContent is a property that returns a byte[] array
- Size is a long that gives the range of the data to copy
- 64 is the offset in Rawcontent to copy from.

Would this call return a byte array with the values from RawContent[64]-> RawContent[Size] ?


EDIT: changed the range setting.

[Christian Binder]

Not, this won't return an array, this will return an IEnumerable<byt e>. You have to call .ToArray() to get back a byte[].

Secondly this won't return index 64 to Size but 64 to 64+Size.


You can define an offset in Enumerable.Rang e like Enumerable.Rang e(64, Size), so you don't have to write m+64.

  return (from offset in Enumerable.Range(64, Size)
          //where offset <= RawContent.GetUpperBound(0) //if you want to, uncomment this line to avoid IndexOutOfBounds
          select RawContent[offset]).ToArray();

[Airslash]

Not, this won't return an array, this will return an IEnumerable<byt e>. You have to call .ToArray() to get back a byte[].

Secondly this won't return index 64 to Size but 64 to 64+Size.


You can define an offset in Enumerable.Rang e like Enumerable.Rang e(64, Size), so you don't have to write m+64.

  return (from offset in Enumerable.Range(64, Size)
          //where offset <= RawContent.GetUpperBound(0) //if you want to, uncomment this line to avoid IndexOutOfBounds
          select RawContent[offset]).ToArray();

thanks for the clarification.
I've currently worked around the issue by passing the same data array to the read function as a reference and add an additional parameter so it either overwriters the data or appends to it depending on the settings.

Thanks for the pointer on the size & offset. Added some checks to validate the size of the array....slippe d my mind.