// Moves a specified file to a new location and potentially a new file name.
// This method does work across volumes.
//
// The caller must have certain FileIOPermissions. The caller must
// have Read and Write permission to
// sourceFileName and Write
// permissions to destFileName.
//
public static void Move(String sourceFileName, String destFileName)
{
// sourceFileName and destFileName validation in Path.GetFullPath()
sourceFileName = Path.GetFullPath(sourceFileName);
destFileName = Path.GetFullPath(destFileName);
bool tryCopyAndDelete = false;
// We only need to lock the source, not the dest because if dest is taken
// Move() will failed at the driver's level anyway. (there will be no conflict even if
// another thread is creating dest, as only one of the operations will succeed --
// the native calls are atomic)
Object srcRecord = FileSystemManager.AddToOpenList(sourceFileName);
try
{
if (!Exists(sourceFileName))
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.FileNotFound);
}
//We'll try copy and deleting if Move returns false
tryCopyAndDelete = !NativeIO.Move(sourceFileName, destFileName);
}
finally
{
FileSystemManager.RemoveFromOpenList(srcRecord);
}
if (tryCopyAndDelete)
{
Copy(sourceFileName, destFileName, false, true);
}
}
public static void Move(string sourceDirName, string destDirName)
{
// sourceDirName and destDirName validation in Path.GetFullPath()
sourceDirName = Path.GetFullPath(sourceDirName);
destDirName = Path.GetFullPath(destDirName);
bool tryCopyAndDelete = false;
Object srcRecord = FileSystemManager.AddToOpenList(sourceDirName);
try
{
// Make sure sourceDir is actually a directory
if (!Exists(sourceDirName))
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.DirectoryNotFound);
}
// If Move() returns false, we'll try doing copy and delete to accomplish the move
tryCopyAndDelete = !NativeIO.Move(sourceDirName, destDirName);
}
finally
{
FileSystemManager.RemoveFromOpenList(srcRecord);
}
if (tryCopyAndDelete)
{
RecursiveCopyAndDelete(sourceDirName, destDirName);
}
}
public static void SetAttributes(String path, FileAttributes fileAttributes)
{
// path validation in Path.GetFullPath()
String fullPath = Path.GetFullPath(path);
NativeIO.SetAttributes(fullPath, (uint)fileAttributes);
}
//--//
public static DirectoryInfo CreateDirectory(string path)
{
// path validation in Path.GetFullPath()
path = Path.GetFullPath(path);
/// According to MSDN, Directory.CreateDirectory on an existing
/// directory is no-op.
NativeIO.CreateDirectory(path);
return(new DirectoryInfo(path));
}
public static void Delete(string path, bool recursive)
{
path = Path.GetFullPath(path);
Object record = FileSystemManager.LockDirectory(path);
try
{
uint attributes = NativeIO.GetAttributes(path);
if (attributes == 0xFFFFFFFF)
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.DirectoryNotFound);
}
if (((attributes & (uint)(FileAttributes.Directory)) == 0) ||
((attributes & (uint)(FileAttributes.ReadOnly)) != 0))
{
/// it's readonly or not a directory
throw new IOException("", (int)IOException.IOExceptionErrorCode.UnauthorizedAccess);
}
if (!Exists(path)) // make sure it is indeed a directory (and not a file)
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.DirectoryNotFound);
}
if (!recursive)
{
NativeFindFile ff = new NativeFindFile(path, "*");
try
{
if (ff.GetNext() != null)
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.DirectoryNotEmpty);
}
}
finally
{
ff.Close();
}
}
NativeIO.Delete(path);
}
finally
{
// regardless of what happened, we need to release the directory when we're done
FileSystemManager.UnlockDirectory(record);
}
}
private static void RecursiveCopyAndDelete(String sourceDirName, String destDirName)
{
String[] files;
int filesCount, i;
int relativePathIndex = sourceDirName.Length + 1; // relative path starts after the sourceDirName and a path seperator
// We have to make sure no one else can modify it (for example, delete the directory and
// create a file of the same name) while we're moving
Object recordSrc = FileSystemManager.AddToOpenList(sourceDirName);
try
{
// Make sure sourceDir is actually a directory
if (!Exists(sourceDirName))
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.DirectoryNotFound);
}
// Make sure destDir does not yet exist
if (Exists(destDirName))
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.PathAlreadyExists);
}
NativeIO.CreateDirectory(destDirName);
files = Directory.GetFiles(sourceDirName);
filesCount = files.Length;
for (i = 0; i < filesCount; i++)
{
File.Copy(files[i], Path.Combine(destDirName, files[i].Substring(relativePathIndex)), false, true);
}
files = Directory.GetDirectories(sourceDirName);
filesCount = files.Length;
for (i = 0; i < filesCount; i++)
{
RecursiveCopyAndDelete(files[i], Path.Combine(destDirName, files[i].Substring(relativePathIndex)));
}
NativeIO.Delete(sourceDirName);
}
finally
{
FileSystemManager.RemoveFromOpenList(recordSrc);
}
}
private const int _defaultCopyBufferSize = 2048; /// Experiment on desktop shows 2k-4k is ideal size perfwise.
internal static void Copy(String sourceFileName, String destFileName, bool overwrite, bool deleteOriginal)
{
// sourceFileName and destFileName validation in Path.GetFullPath()
sourceFileName = Path.GetFullPath(sourceFileName);
destFileName = Path.GetFullPath(destFileName);
FileMode writerMode = (overwrite) ? FileMode.Create : FileMode.CreateNew;
FileStream reader = new FileStream(sourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read, NativeFileStream.BufferSizeDefault);
try
{
using (FileStream writer = new FileStream(destFileName, writerMode, FileAccess.Write, FileShare.None, NativeFileStream.BufferSizeDefault))
{
long fileLength = reader.Length;
writer.SetLength(fileLength);
byte[] buffer = new byte[_defaultCopyBufferSize];
for (; ;)
{
int readSize = reader.Read(buffer, 0, _defaultCopyBufferSize);
if (readSize <= 0)
{
break;
}
writer.Write(buffer, 0, readSize);
}
// Copy the attributes too
NativeIO.SetAttributes(destFileName, NativeIO.GetAttributes(sourceFileName));
}
}
finally
{
if (deleteOriginal)
{
reader.DisposeAndDelete();
}
else
{
reader.Dispose();
}
}
}
// Deletes a file. The file specified by the designated path is deleted.
// If the file does not exist, Delete succeeds without throwing
// an exception.
//
// On NT, Delete will fail for a file that is open for normal I/O
// or a file that is memory mapped. On Win95, the file will be
// deleted irregardless of whether the file is being used.
//
// Your application must have Delete permission to the target file.
//
public static void Delete(String path)
{
// path validation in Path.GetFullPath()
path = Path.GetFullPath(path);
string folderPath = Path.GetDirectoryName(path);
// We have to make sure no one else has the file opened, and no one else can modify it when we're deleting
Object record = FileSystemManager.AddToOpenList(path);
try
{
uint attributes = NativeIO.GetAttributes(folderPath);
/// If the folder does not exist or invalid we throw DirNotFound Exception (same as desktop).
if (attributes == 0xFFFFFFFF)
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.DirectoryNotFound);
}
/// Folder exists, lets verify whether the file itself exists.
attributes = NativeIO.GetAttributes(path);
if (attributes == 0xFFFFFFFF)
{
// No-op on file not found
return;
}
if ((attributes & (uint)(FileAttributes.Directory | FileAttributes.ReadOnly)) != 0)
{
/// it's a readonly file or an directory
throw new IOException("", (int)IOException.IOExceptionErrorCode.UnauthorizedAccess);
}
NativeIO.Delete(path);
}
finally
{
// regardless of what happened, we need to release the file when we're done
FileSystemManager.RemoveFromOpenList(record);
}
}
public static FileAttributes GetAttributes(String path)
{
// path validation in Path.GetFullPath()
String fullPath = Path.GetFullPath(path);
uint attributes = NativeIO.GetAttributes(fullPath);
if (attributes == 0xFFFFFFFF)
{
throw new IOException("", (int)IOException.IOExceptionErrorCode.FileNotFound);
}
else if (attributes == 0x0)
{
return(FileAttributes.Normal);
}
else
{
return((FileAttributes)attributes);
}
}
// Tests if a file exists. The result is true if the file
// given by the specified path exists; otherwise, the result is
// false. Note that if path describes a directory,
// Exists will return true.
//
// Your application must have Read permission for the target directory.
//
public static bool Exists(String path)
{
try
{
// path validation in Path.GetFullPath()
path = Path.GetFullPath(path);
/// Is this the absolute root? this is not a file.
string root = Path.GetPathRoot(path);
if (String.Equals(root, path))
{
return(false);
}
else
{
uint attributes = NativeIO.GetAttributes(path);
/// This is essentially file not found.
if (attributes == 0xFFFFFFFF)
{
return(false);
}
if ((attributes & (uint)FileAttributes.Directory) == 0)
{
/// Not a directory, it must be a file.
return(true);
}
}
}
catch (Exception)
{
/// Like desktop, exists here does not throw exception in
/// a number of cases, instead returns false. For more
/// details see MSDN.
}
return(false);
}
public static bool Exists(string path)
{
// path validation in Path.GetFullPath()
path = Path.GetFullPath(path);
/// Is this the absolute root? this always exists.
if (path == NativeIO.FSRoot)
{
return(true);
}
else
{
try
{
uint attributes = NativeIO.GetAttributes(path);
/// This is essentially file not found.
if (attributes == 0xFFFFFFFF)
{
return(false);
}
/// Need to make sure these are not FAT16 or FAT32 specific.
if ((((FileAttributes)attributes) & FileAttributes.Directory) == FileAttributes.Directory)
{
/// It is a directory.
return(true);
}
}
catch (Exception)
{
return(false);
}
}
return(false);
}
