Get Byte Count For Folder And Subfolders

[joey.powell]

I am working on a windows forms app where I need to do copies. I also
need to show a progress bar. In order to be able to set the Maximum
property for the progress bar and then update it during the copy, I
must determine the total byte count for the folder and subfolders that
the user has selected before the copy begins. I already have this
working in one way, but it is SLOW. Currently, I am crawling (no pun
intended) over each file, checking its size, and then incrementing a
variable to get to the total bytecount in the end. I KNOW there has to
be a faster way. How do I get this information, like from an index or
something? For sure, that would be a much faster way to do it than what
I am doing now. Thanks in advance for any help.

JP

[Mattias Sjögren]

I already have this
working in one way, but it is SLOW. Currently, I am crawling (no pun
intended) over each file, checking its size, and then incrementing a
variable to get to the total bytecount in the end. I KNOW there has to
be a faster way.

I don't think there is.
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Jon Skeet [C# MVP]]

<jo*********@topscene.com> wrote:

I am working on a windows forms app where I need to do copies. I also
need to show a progress bar. In order to be able to set the Maximum
property for the progress bar and then update it during the copy, I
must determine the total byte count for the folder and subfolders that
the user has selected before the copy begins. I already have this
working in one way, but it is SLOW. Currently, I am crawling (no pun
intended) over each file, checking its size, and then incrementing a
variable to get to the total bytecount in the end. I KNOW there has to
be a faster way. How do I get this information, like from an index or
something? For sure, that would be a much faster way to do it than what
I am doing now. Thanks in advance for any help.

Is it much slower than, say, Explorer doing the same thing? (Note that
you probably need to flush any disk caches, eg by rebooting, between
test runs.)

Can you post the code as a short but complete program so we could see
if anything's obviously missing?

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

[Willy Denoyette [MVP]]

<jo*********@topscene.com> wrote in message
news:11********************@i39g2000cwa.googlegrou ps.com...
|I am working on a windows forms app where I need to do copies. I also
| need to show a progress bar. In order to be able to set the Maximum
| property for the progress bar and then update it during the copy, I
| must determine the total byte count for the folder and subfolders that
| the user has selected before the copy begins. I already have this
| working in one way, but it is SLOW. Currently, I am crawling (no pun
| intended) over each file, checking its size, and then incrementing a
| variable to get to the total bytecount in the end. I KNOW there has to
| be a faster way. How do I get this information, like from an index or
| something? For sure, that would be a much faster way to do it than what
| I am doing now. Thanks in advance for any help.
|
| JP
|

How are you checking it's size?
And how are you copying the files?
Willy.

[joey.powell]

On the first pass, to get the size I am using instances of the FileInfo
class. On the second pass, to copy I am using System.IO File.Copy.

Any suggestions for improvement?

[voorreclame]

jo*********@topscene.com schreef:

On the first pass, to get the size I am using instances of the FileInfo
class. On the second pass, to copy I am using System.IO File.Copy.

Any suggestions for improvement?

Have a look at
http://khsw.blogspot.com/2006/03/cop...-progress.html
I might give you some ideas I hope.

[Greg Young]

http://www.experts-exchange.com/Prog..._21085332.html

contains a completely managed example I did a while ago for someone using
VB.NET, I built work objects along the way so it only did a single pass
which gains quite a bit of speed.

Cheers,

Greg
<vo*********@yahoo.com> wrote in message
news:11**********************@i39g2000cwa.googlegr oups.com...

jo*********@topscene.com schreef:

On the first pass, to get the size I am using instances of the FileInfo
class. On the second pass, to copy I am using System.IO File.Copy.

Any suggestions for improvement?

Have a look at
http://khsw.blogspot.com/2006/03/cop...-progress.html
I might give you some ideas I hope.