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loading files into array

What is the best and speedy way of loading files into an array?

i have an

int[] MyArray = new int[1000000];

and a file (size is 4000000 byte)
Nov 16 '05 #1
4 2119
What is the best and speedy way of loading files into an array?


I would

- Open a FileStream for the file
- Construct a BinaryReader around it
- Read the data into a byte[4000000] with BinaryReader.Re ad
- Use Buffer.BlockCop y to copy it over to the int[]

assuming that there's enough memory available and duplicating the data
isn't a problem.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.
Nov 16 '05 #2
Baris <b_*****@supero nline.com> wrote:
What is the best and speedy way of loading files into an array?

i have an

int[] MyArray = new int[1000000];

and a file (size is 4000000 byte)


Well, I would ask why you want to load it into an array of ints instead
of bytes to start with. Is your data *actually* just a series of
1000000 ints?

Anyway, see http://www.pobox.com/~skeet/csharp/readbinary.html for more
information about reading the file.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 16 '05 #3
Yes,

my data is a series of 1000000 ints.
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** **************@ msnews.microsof t.com...
Baris <b_*****@supero nline.com> wrote:
What is the best and speedy way of loading files into an array?

i have an

int[] MyArray = new int[1000000];

and a file (size is 4000000 byte)


Well, I would ask why you want to load it into an array of ints instead
of bytes to start with. Is your data *actually* just a series of
1000000 ints?

Anyway, see http://www.pobox.com/~skeet/csharp/readbinary.html for more
information about reading the file.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

Nov 16 '05 #4
Baris <b_*****@supero nline.com> wrote:
my data is a series of 1000000 ints.


Well, *if* they're in the appropriate format, just calling
BinaryReader.Re adInt32 1000000 times is probably a reasonable bet.

Alternatively, read it in as a byte array in the normal way and then
use Buffer.BlockCop y to copy it into an int array.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Nov 16 '05 #5

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