C# FileOptions类代码示例

 /// <summary>
 ///     文件分块写入流
 /// </summary>
 /// <param name="fileName">文件全名</param>
 /// <param name="fileOption">附加选项</param>
 public TmphFileBlockStream(string fileName, FileOptions fileOption = FileOptions.None)
     : base(fileName, File.Exists(fileName) ? FileMode.Open : FileMode.CreateNew, FileShare.Read, fileOption)
 {
     fileReader = new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read, bufferLength,
         fileOption);
     waitHandle = wait;
 }

        public int CreateFile(string filename, FileAccess access, FileShare share, FileMode mode, FileOptions options, DokanFileInfo info)
        {
            Trace.WriteLine(string.Format("CreateFile FILENAME({0}) ACCESS({1}) SHARE({2}) MODE({3})", filename, access, share, mode));

            if (mode == FileMode.Create || mode == FileMode.OpenOrCreate || mode == FileMode.CreateNew)
            {
                // we want to write a file
                var fileRef = Extensions.GetFileReference(root, filename.ToFileString());
                fileRef.Create(0);
                return 0;
            }

            if (share == FileShare.Delete)
            {
                return DeleteFile(filename, info);
            }

            if (GetFileInformation(filename, new FileInformation(), new DokanFileInfo(0)) == 0)
            {
                return 0;
            }
            else
            {
                return -DokanNet.ERROR_FILE_NOT_FOUND;
            }
        }

        private SafeFileHandle OpenHandle(FileMode mode, FileShare share, FileOptions options)
        {
            // FileStream performs most of the general argument validation.  We can assume here that the arguments
            // are all checked and consistent (e.g. non-null-or-empty path; valid enums in mode, access, share, and options; etc.)
            // Store the arguments
            _mode = mode;
            _options = options;

            if (_useAsyncIO)
                _asyncState = new AsyncState();

            // Translate the arguments into arguments for an open call.
            Interop.Sys.OpenFlags openFlags = PreOpenConfigurationFromOptions(mode, _access, options); // FileShare currently ignored

            // If the file gets created a new, we'll select the permissions for it.  Most Unix utilities by default use 666 (read and 
            // write for all), so we do the same (even though this doesn't match Windows, where by default it's possible to write out
            // a file and then execute it). No matter what we choose, it'll be subject to the umask applied by the system, such that the
            // actual permissions will typically be less than what we select here.
            const Interop.Sys.Permissions OpenPermissions =
                Interop.Sys.Permissions.S_IRUSR | Interop.Sys.Permissions.S_IWUSR |
                Interop.Sys.Permissions.S_IRGRP | Interop.Sys.Permissions.S_IWGRP |
                Interop.Sys.Permissions.S_IROTH | Interop.Sys.Permissions.S_IWOTH;

            // Open the file and store the safe handle.
            return SafeFileHandle.Open(_path, openFlags, (int)OpenPermissions);
        }

 public SqlFileStream(string path, byte[] transactionContext, FileAccess access, FileOptions options, long allocationSize)
 {
     IntPtr ptr;
     this.ObjectID = Interlocked.Increment(ref _objectTypeCount);
     Bid.ScopeEnter(out ptr, "<sc.SqlFileStream.ctor|API> %d# access=%d options=%d path='%ls' ", this.ObjectID, (int) access, (int) options, path);
     try
     {
         if (transactionContext == null)
         {
             throw ADP.ArgumentNull("transactionContext");
         }
         if (path == null)
         {
             throw ADP.ArgumentNull("path");
         }
         this.m_disposed = false;
         this.m_fs = null;
         this.OpenSqlFileStream(path, transactionContext, access, options, allocationSize);
         this.Name = path;
         this.TransactionContext = transactionContext;
     }
     finally
     {
         Bid.ScopeLeave(ref ptr);
     }
 }

        public DokanError CreateFile(string fileName, DokanNet.FileAccess access, FileShare share, FileMode mode, FileOptions options, FileAttributes attributes, DokanFileInfo info)
        {
            info.DeleteOnClose = (options & FileOptions.DeleteOnClose) != 0;
            //Console.WriteLine("CreateFile: {0}, mode = {1}", fileName, mode);

            if (fileName == "\\")
            {
                return DokanError.ErrorSuccess;
            }

            Directory dir = new Directory(Util.GetPathDirectory(fileName));
            if (!dir.Exists())
            {
                return DokanError.ErrorPathNotFound;
            }

            String name = Util.GetPathFileName(fileName);

            if (name.Length == 0)
            {
                return DokanError.ErrorInvalidName;
            }
            if (name.IndexOfAny(Path.GetInvalidFileNameChars()) > -1)
            {
                return DokanError.ErrorInvalidName;
            }

            // dokan API 要求在目标文件是目录时候，设置 info.IsDirectory = true
            if (dir.Contains(name) && (dir.GetItemInfo(name).attribute & FileAttributes.Directory) != 0)
            {
                info.IsDirectory = true;
                return DokanError.ErrorSuccess;
            }

            try
            {
                File f = new File(fileName, mode);
                f.flagDeleteOnClose = info.DeleteOnClose;
                info.Context = f;
            }
            catch (FileNotFoundException)
            {
                return DokanError.ErrorFileNotFound;
            }
            catch (IOException)
            {
                return DokanError.ErrorAlreadyExists;
            }
            catch (NotImplementedException)
            {
                return DokanError.ErrorAccessDenied;
            }
            catch (Exception)
            {
                return DokanError.ErrorError;
            }

            return DokanError.ErrorSuccess;
        }

        private void Init(String path, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options)
        {
            if (path == null)
                throw new ArgumentNullException("path", SR.ArgumentNull_Path);
            if (path.Length == 0)
                throw new ArgumentException(SR.Argument_EmptyPath, "path");

            // don't include inheritable in our bounds check for share
            FileShare tempshare = share & ~FileShare.Inheritable;
            String badArg = null;

            if (mode < FileMode.CreateNew || mode > FileMode.Append)
                badArg = "mode";
            else if (access < FileAccess.Read || access > FileAccess.ReadWrite)
                badArg = "access";
            else if (tempshare < FileShare.None || tempshare > (FileShare.ReadWrite | FileShare.Delete))
                badArg = "share";

            if (badArg != null)
                throw new ArgumentOutOfRangeException(badArg, SR.ArgumentOutOfRange_Enum);

            // NOTE: any change to FileOptions enum needs to be matched here in the error validation
            if (options != FileOptions.None && (options & ~(FileOptions.WriteThrough | FileOptions.Asynchronous | FileOptions.RandomAccess | FileOptions.DeleteOnClose | FileOptions.SequentialScan | FileOptions.Encrypted | (FileOptions)0x20000000 /* NoBuffering */)) != 0)
                throw new ArgumentOutOfRangeException("options", SR.ArgumentOutOfRange_Enum);

            if (bufferSize <= 0)
                throw new ArgumentOutOfRangeException("bufferSize", SR.ArgumentOutOfRange_NeedPosNum);

            // Write access validation
            if ((access & FileAccess.Write) == 0)
            {
                if (mode == FileMode.Truncate || mode == FileMode.CreateNew || mode == FileMode.Create || mode == FileMode.Append)
                {
                    // No write access
                    throw new ArgumentException(SR.Format(SR.Argument_InvalidFileModeAndAccessCombo, mode, access));
                }
            }

            string fullPath = PathHelpers.GetFullPathInternal(path);

            // Prevent access to your disk drives as raw block devices.
            if (fullPath.StartsWith("\\\\.\\", StringComparison.Ordinal))
                throw new ArgumentException(SR.Arg_DevicesNotSupported);

#if !PLATFORM_UNIX
            // Check for additional invalid characters.  Most invalid characters were checked above
            // in our call to Path.GetFullPath(path);
            if (HasAdditionalInvalidCharacters(fullPath))
                throw new ArgumentException(SR.Argument_InvalidPathChars);

            if (fullPath.IndexOf(':', 2) != -1)
                throw new NotSupportedException(SR.Argument_PathFormatNotSupported);
#endif

            if ((access & FileAccess.Read) != 0 && mode == FileMode.Append)
                throw new ArgumentException(SR.Argument_InvalidAppendMode);

            this._innerStream = FileSystem.Current.Open(fullPath, mode, access, share, bufferSize, options, this);
        }

 public CreateFileOperation( string path, int bufferSize, FileOptions options, FileSecurity fileSecurity )
 {
     this.path = path;
     this.bufferSize = bufferSize;
     this.options = options;
     this.fileSecurity = fileSecurity;
     tempFilePath = Path.Combine( Path.GetTempPath(), Path.GetRandomFileName() );
 }

 public void DeleteOnClose_FileDeletedAfterClose(FileOptions options)
 {
     string path = GetTestFilePath();
     Assert.False(File.Exists(path));
     using (CreateFileStream(path, FileMode.Create, FileAccess.ReadWrite, FileShare.None, 0x1000, options))
     {
         Assert.True(File.Exists(path));
     }
     Assert.False(File.Exists(path));
 }

 public Stream OpenFile(
     string path,
     FileMode fileMode,
     FileAccess fileAccess,
     FileShare fileShare,
     int bufferSize,
     FileOptions fileOptions)
 {
     return new FileStream(path, fileMode, fileAccess, fileShare, bufferSize, fileOptions);
 }

 public virtual int CreateFile(string filename, 
     FileAccess access, 
     FileShare share, 
     FileMode mode, 
     FileOptions options, 
     DokanFileInfo info)
 {
     try { return -1; }
     catch { return -1; }
 }

 public int CreateFile(string filename, FileAccess access, FileShare share, FileMode mode, FileOptions options, DokanFileInfo info)
 {
     int result = _fileSystem.CreateFile(filename, access, share, mode, options, info);
     if (this._logging)
     {
         Console.WriteLine("CreateFile: " + filename);
         Console.WriteLine("Result: " + result);
     }
     return result;
 }

        private NtStatus Trace(string method, string fileName, DokanFileInfo info,
                                  FileAccess access, FileShare share, FileMode mode, FileOptions options, FileAttributes attributes,
                                  NtStatus result)
        {
#if TRACE
            Console.WriteLine(string.Format(CultureInfo.InvariantCulture, "{0}('{1}', {2}, [{3}], [{4}], [{5}], [{6}], [{7}]) -> {8}",
                method, fileName, ToTrace(info), access, share, mode, options, attributes, result));
#endif

            return result;
        }

        public int CreateFile(string filename, FileAccess access, FileShare share, FileMode mode, FileOptions options, DokanFileInfo info)
        {
            Console.WriteLine("Create File : " + filename);

            var response = MakeComplexRequest(Path + CREATE_FILE_REQUEST_STRING, SecurityElement.Escape(filename), (int)access, (int)share, (int)mode, (int)options, info.ProcessId);

            if (response.ContainsKey("message"))
                Console.WriteLine("Create File Message : " + response["message"]);

            return int.Parse(response["response_code"]);
        }

        private AtomicFileStream(string path, string tempPath, FileMode mode, FileAccess access, FileShare share, int bufferSize, FileOptions options)
            : base(tempPath, mode, access, share, bufferSize, options)
        {
            if (path == null)
                throw new ArgumentNullException("path");
            if (tempPath == null)
                throw new ArgumentNullException("tempPath");

            this.path = path;
            this.tempPath = tempPath;
        }

        internal WinRTFileStream(Stream innerStream, StorageFile file, FileAccess access, FileOptions options, FileStream parent) 
            : base(parent)
        {
            Debug.Assert(innerStream != null);
            Debug.Assert(file != null);

            this._access = access;
            this._disposed = false;
            this._file = file;
            this._innerStream = innerStream;
            this._options = options;
        }