| private InternalExists ( String path ) : bool | ||
| path | String | |
| Résultat | bool | |
internal static bool InternalExists(String path)
{
Contract.Requires(path != null);
String tempPath = Path.AddLongPathPrefix(path);
return(File.InternalExists(tempPath));
}
public override void CreateDirectory(string fullPath)
{
if (PathInternal.IsDirectoryTooLong(fullPath))
{
throw new PathTooLongException(SR.IO_PathTooLong);
}
// We can save a bunch of work if the directory we want to create already exists. This also
// saves us in the case where sub paths are inaccessible (due to ERROR_ACCESS_DENIED) but the
// final path is accessable and the directory already exists. For example, consider trying
// to create c:\Foo\Bar\Baz, where everything already exists but ACLS prevent access to c:\Foo
// and c:\Foo\Bar. In that case, this code will think it needs to create c:\Foo, and c:\Foo\Bar
// and fail to due so, causing an exception to be thrown. This is not what we want.
if (DirectoryExists(fullPath))
{
return;
}
List <string> stackDir = new List <string>();
// Attempt to figure out which directories don't exist, and only
// create the ones we need. Note that InternalExists may fail due
// to Win32 ACL's preventing us from seeing a directory, and this
// isn't threadsafe.
bool somepathexists = false;
int length = fullPath.Length;
// We need to trim the trailing slash or the code will try to create 2 directories of the same name.
if (length >= 2 && PathHelpers.EndsInDirectorySeparator(fullPath))
{
length--;
}
int lengthRoot = PathInternal.GetRootLength(fullPath);
if (length > lengthRoot)
{
// Special case root (fullpath = X:\\)
int i = length - 1;
while (i >= lengthRoot && !somepathexists)
{
String dir = fullPath.Substring(0, i + 1);
if (!DirectoryExists(dir)) // Create only the ones missing
{
stackDir.Add(dir);
}
else
{
somepathexists = true;
}
while (i > lengthRoot && !PathInternal.IsDirectorySeparator(fullPath[i]))
{
i--;
}
i--;
}
}
int count = stackDir.Count;
// If we were passed a DirectorySecurity, convert it to a security
// descriptor and set it in he call to CreateDirectory.
Interop.mincore.SECURITY_ATTRIBUTES secAttrs = default(Interop.mincore.SECURITY_ATTRIBUTES);
bool r = true;
int firstError = 0;
String errorString = fullPath;
// If all the security checks succeeded create all the directories
while (stackDir.Count > 0)
{
String name = stackDir[stackDir.Count - 1];
stackDir.RemoveAt(stackDir.Count - 1);
r = Interop.mincore.CreateDirectory(name, ref secAttrs);
if (!r && (firstError == 0))
{
int currentError = Marshal.GetLastWin32Error();
// While we tried to avoid creating directories that don't
// exist above, there are at least two cases that will
// cause us to see ERROR_ALREADY_EXISTS here. InternalExists
// can fail because we didn't have permission to the
// directory. Secondly, another thread or process could
// create the directory between the time we check and the
// time we try using the directory. Thirdly, it could
// fail because the target does exist, but is a file.
if (currentError != Interop.mincore.Errors.ERROR_ALREADY_EXISTS)
{
firstError = currentError;
}
else
{
// If there's a file in this directory's place, or if we have ERROR_ACCESS_DENIED when checking if the directory already exists throw.
if (File.InternalExists(name) || (!DirectoryExists(name, out currentError) && currentError == Interop.mincore.Errors.ERROR_ACCESS_DENIED))
{
firstError = currentError;
errorString = name;
}
}
}
}
// We need this check to mask OS differences
// Handle CreateDirectory("X:\\") when X: doesn't exist. Similarly for n/w paths.
if ((count == 0) && !somepathexists)
{
String root = Directory.InternalGetDirectoryRoot(fullPath);
if (!DirectoryExists(root))
{
throw Win32Marshal.GetExceptionForWin32Error(Interop.mincore.Errors.ERROR_PATH_NOT_FOUND, root);
}
return;
}
// Only throw an exception if creating the exact directory we
// wanted failed to work correctly.
if (!r && (firstError != 0))
{
throw Win32Marshal.GetExceptionForWin32Error(firstError, errorString);
}
}
internal static bool InternalExists(string path)
{
return(File.InternalExists(Path.AddLongPathPrefix(path)));
}
internal static unsafe void InternalCreateDirectory(string fullPath, string path, object dirSecurityObj)
{
DirectorySecurity security = (DirectorySecurity)dirSecurityObj;
int length = fullPath.Length;
if ((length >= 2) && Path.IsDirectorySeparator(fullPath[length - 1]))
{
length--;
}
int rootLength = Path.GetRootLength(fullPath);
if ((length == 2) && Path.IsDirectorySeparator(fullPath[1]))
{
throw new IOException(Environment.GetResourceString("IO.IO_CannotCreateDirectory", new object[] { path }));
}
List <string> list = new List <string>();
bool flag = false;
if (length > rootLength)
{
for (int i = length - 1; (i >= rootLength) && !flag; i--)
{
string str = fullPath.Substring(0, i + 1);
if (!InternalExists(str))
{
list.Add(str);
}
else
{
flag = true;
}
while (((i > rootLength) && (fullPath[i] != Path.DirectorySeparatorChar)) && (fullPath[i] != Path.AltDirectorySeparatorChar))
{
i--;
}
}
}
int count = list.Count;
if (list.Count != 0)
{
string[] array = new string[list.Count];
list.CopyTo(array, 0);
for (int j = 0; j < array.Length; j++)
{
string[] strArray2;
IntPtr ptr;
(strArray2 = array)[(int)(ptr = (IntPtr)j)] = strArray2[(int)ptr] + @"\.";
}
AccessControlActions control = (security == null) ? AccessControlActions.None : AccessControlActions.Change;
new FileIOPermission(FileIOPermissionAccess.Write, control, array, false, false).Demand();
}
Win32Native.SECURITY_ATTRIBUTES structure = null;
if (security != null)
{
structure = new Win32Native.SECURITY_ATTRIBUTES {
nLength = Marshal.SizeOf(structure)
};
byte[] securityDescriptorBinaryForm = security.GetSecurityDescriptorBinaryForm();
byte * pDest = stackalloc byte[(IntPtr)securityDescriptorBinaryForm.Length];
Buffer.memcpy(securityDescriptorBinaryForm, 0, pDest, 0, securityDescriptorBinaryForm.Length);
structure.pSecurityDescriptor = pDest;
}
bool flag2 = true;
int errorCode = 0;
string maybeFullPath = path;
while (list.Count > 0)
{
string str3 = list[list.Count - 1];
list.RemoveAt(list.Count - 1);
if (str3.Length >= 0xf8)
{
throw new PathTooLongException(Environment.GetResourceString("IO.PathTooLong"));
}
flag2 = Win32Native.CreateDirectory(str3, structure);
if (!flag2 && (errorCode == 0))
{
int lastError = Marshal.GetLastWin32Error();
if (lastError != 0xb7)
{
errorCode = lastError;
}
else if (File.InternalExists(str3) || (!InternalExists(str3, out lastError) && (lastError == 5)))
{
errorCode = lastError;
try
{
new FileIOPermission(FileIOPermissionAccess.PathDiscovery, GetDemandDir(str3, true)).Demand();
maybeFullPath = str3;
continue;
}
catch (SecurityException)
{
continue;
}
}
}
}
if ((count == 0) && !flag)
{
if (!InternalExists(InternalGetDirectoryRoot(fullPath)))
{
__Error.WinIOError(3, InternalGetDirectoryRoot(path));
}
}
else if (!flag2 && (errorCode != 0))
{
__Error.WinIOError(errorCode, maybeFullPath);
}
}
