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FileOptions Enumeration

Represents advanced options for creating a FileStream object.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

[<SerializableAttribute>]
[<ComVisibleAttribute(true)>]
[<FlagsAttribute>]
type FileOptions

Member nameDescription
AsynchronousIndicates that a file can be used for asynchronous reading and writing.
DeleteOnCloseIndicates that a file is automatically deleted when it is no longer in use.
EncryptedIndicates that a file is encrypted and can be decrypted only by using the same user account used for encryption.
NoneIndicates that no additional options should be used when creating a FileStream object.
RandomAccessIndicates that the file is accessed randomly. The system can use this as a hint to optimize file caching.
SequentialScanIndicates that the file is to be accessed sequentially from beginning to end. The system can use this as a hint to optimize file caching. If an application moves the file pointer for random access, optimum caching may not occur; however, correct operation is still guaranteed.

Specifying this flag can increase performance for applications that read large files using sequential access. Performance gains can be even more noticeable for applications that read large files mostly sequentially, but occasionally skip over small ranges of bytes.

WriteThroughIndicates that the system should write through any intermediate cache and go directly to disk.

The following example shows how to use the Asynchronous value when creating a file stream.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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