I get an UnautorizedAccessException
running this code:
string[] fileList = Directory.GetFiles(strDir, strExt);
The exception occurs in c:\users\username\appdata
How can I check if I have access permission (to list and read files) ?
First of all, I would manually check the permissions and see what blocks you and what doesn't. I am using something like this to check for permissions (for copy file):
AuthorizationRuleCollection acl = fileSecurity.GetAccessRules(true, true,typeof(System.Security.Principal.SecurityIdentifier));
bool denyEdit = false;
for (int x = 0; x < acl.Count; x++)
{
FileSystemAccessRule currentRule = (FileSystemAccessRule)acl[x];
AccessControlType accessType = currentRule.AccessControlType;
//Copy file cannot be executed for "List Folder/Read Data" and "Read extended attributes" denied permission
if (accessType == AccessControlType.Deny && (currentRule.FileSystemRights & FileSystemRights.ListDirectory) == FileSystemRights.ListDirectory)
{
//we have deny copy - we can't copy the file
denyEdit = true;
break;
}
... more checks
}
Also, there are some strange cases where a certain right on the folder changes the right for the files regardless of their individual permissions (will see if I can find what it is).
Check article on code project which is about the thing you need, the is class created for this : The purpose of this class is to provide a simple answer to a common question, "Do I have permission to Read or Write this file?".
A simple way to test individual access rights for a given file and user
Note: cannot post whole code over here because its too long.
First, call Directory.GetFiles
for root directory. Catch UnauthorizedAccessException
- if none, you have full access.
If caught - call the function for each subdir recursively, catch the exception, if caught - add such dir to list.
Write a recursive function with external list for forbidden dirs
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