c# - Writing List<String> of Directories with Subdirectories -


now, know there lot of questions on stackoverflow folder recursion , getting folder including it's sub-directories etc. pp., haven't found related i'm encountering here.

my problem follows:

i've taken code snippet folder recursion here (page bottom) , adapted needs; is, having not write (sub)directories console having add them list instead. here code (note part that's commented out):

private static list<string> showallfoldersunder(string path) {    var folderlist = new list<string>();    try    {       if ((file.getattributes(path) & fileattributes.reparsepoint)          != fileattributes.reparsepoint)       {          foreach (string folder in directory.getdirectories(path))          {             folderlist.add(folder);             // console.writeline(folder);             showallfoldersunder(folder);          }       }    }    catch (unauthorizedaccessexception) { }    return folderlist; }

this how call (dir string containing path):

var _folders = showallfoldersunder(dir); foreach (string folder in _folders) {     console.writeline(folder); }

the problem first level of folders added list, meaning output example:

[...] c:\users\test\pictures c:\users\test\recent c:\users\test\saved games c:\users\test\searches c:\users\test\sendto [...]

if uncomment console.writeline(folder); method, echoes (sub)directories console:

[...] c:\users\test\appdata\roaming\microsoft\internet explorer\quick launch\user pinned c:\users\test\appdata\roaming\microsoft\internet explorer\quick launch\user pinned\implicitappshortcuts c:\users\test\appdata\roaming\microsoft\internet explorer\quick launch\user pinned\taskbar c:\users\test\appdata\roaming\microsoft\internet explorer\userdata c:\users\test\appdata\roaming\microsoft\internet explorer\userdata\low c:\users\test\appdata\roaming\microsoft\mmc c:\users\test\appdata\roaming\microsoft\network [...]

i'm desperate after having spent hours researching mistake. have clue what's causing problem?

modify method this

private static void showallfoldersunder(string path, list<string> folderlist) {    try    {       if ((file.getattributes(path) & fileattributes.reparsepoint)          != fileattributes.reparsepoint)       {          foreach (string folder in directory.getdirectories(path))          {             folderlist.add(folder);             // console.writeline(folder);             showallfoldersunder(folder, folderlist);          }       }    }    catch (unauthorizedaccessexception) { } }

now call this

var _folders = new list<string>(); showallfoldersunder(dir, _folders);

this way prevent many list creation , memory consumption in other answers. using way supply initial list method , add entries it, other answers generate list each time , copy result upper list , cause lot of memory allocation, copy , deallocation.


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