C#: Как проверить, могу ли я прочитать и/или удалить каталог
Помимо уже упомянутой опции переопределения сохранения, вы можете просто сохранить весь текст в нижнем регистре в базе данных и использовать его для своей выгоды при отображении.
class State(models.Model):
name = models.CharField(max_length=50, unique=True)
def save(self, force_insert=False, force_update=False):
self.name = self.name.lower()
super(State, self).save(force_insert, force_update)
3 ответа
If you intend to delete it, try to delete it and then proceed (handling the exception as appropriate).
If you perform a check-and-then-delete-if-should-be-able-to-delete there is the chance of a race condition on the filesystem, however slight. This applies to most all file/directory access operations. Most filesystem operations are designed to be atomic and moving this logic into user code conflicts this atomicity and one would still need to handle a possible exception being raised.
Я создал следующий код. Посмотрите, поможет ли это:
//using System.IO;
//using System.Security.AccessControl;
//using System.Security.Principal;
string[] directories = Directory.GetDirectories(
Path.Combine(Environment.CurrentDirectory, @"..\.."),
"*", SearchOption.AllDirectories);
foreach (string directory in directories)
{
DirectoryInfo info = new DirectoryInfo(directory);
DirectorySecurity security = info.GetAccessControl();
Console.WriteLine(info.FullName);
foreach (FileSystemAccessRule rule in
security.GetAccessRules(true, true, typeof(NTAccount)))
{
Console.WriteLine("\tIdentityReference = {0}", rule.IdentityReference);
Console.WriteLine("\tInheritanceFlags = {0}", rule.InheritanceFlags );
Console.WriteLine("\tPropagationFlags = {0}", rule.PropagationFlags );
Console.WriteLine("\tAccessControlType = {0}", rule.AccessControlType);
Console.WriteLine("\tFileSystemRights = {0}", rule.FileSystemRights );
Console.WriteLine();
}
}
Результат:
D:\Projects\ConsoleApplication1\bin
IdentityReference = BUILTIN\Administrators
InheritanceFlags = ContainerInherit, ObjectInherit
PropagationFlags = None
AccessControlType = Allow
FileSystemRights = FullControl
Обратите внимание, что свойства IdentityReference и FileSystemRights ; вероятно, вам следует проверить свой текущий ACL, прежде чем пытаться удалить каталог.
I believe you will need to write your own GetDirectories() method; that recursivly gets the ones inside of it.
This Microsoft Article has a good article on how to do it, with a bit of work you can clean it up to use Generic Lists and make it fit your solution.
Simply put, System.IO.Directory.GetDirectories() will fail every time it gets one of those exceptions.
Code roughly like this (copied from above) should get you started
List<String> directories = new List<String>();
void DirSearch(string sDir)
{
try
{
foreach (string d in Directory.GetDirectories(sDir))
{
//foreach (string f in Directory.GetFiles(d, txtFile.Text))
//{
//
//}
// use this to search for files recursivly.
directories.Add(d);
DirSearch(d);
}
}
catch (System.Exception excpt)
{
Console.WriteLine(excpt.Message);
}
}
Once you have your list of directories, you can then perform operations on them, with some mods the above method should ensure you have read permissions on anything in the list.