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FileStream.FileStream(SafeFileHandle, FileAccess, Int32, Boolean) Constructor

Initializes a new instance of the FileStream class for the specified file handle, with the specified read/write permission, buffer size, and synchronous or asynchronous state.

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

public FileStream (
	SafeFileHandle handle,
	FileAccess access,
	int bufferSize,
	bool isAsync
)
public FileStream (
	SafeFileHandle handle, 
	FileAccess access, 
	int bufferSize, 
	boolean isAsync
)
public function FileStream (
	handle : SafeFileHandle, 
	access : FileAccess, 
	bufferSize : int, 
	isAsync : boolean
)
Not applicable.

Parameters

handle

A file handle for the file that this FileStream object will encapsulate.

access

A FileAccess constant that gets the CanRead and CanWrite properties of the FileStream object.

bufferSize

A positive Int32 value greater than 0 indicating the buffer size. For bufferSize values between one and eight, the actual buffer size is set to eight bytes.

isAsync

true if the handle was opened asynchronously (that is, in overlapped I/O mode); otherwise, false.

Exception typeCondition

ArgumentException

The handle parameter is an invalid handle.

-or-

The handle parameter is a synchronous handle and it was used asynchronously.

ArgumentOutOfRangeException

The bufferSize parameter is negative.

IOException

An I/O error occurs, such as a disk error.

-or-

The stream has been closed.

SecurityException

The caller does not have the required permission.

UnauthorizedAccessException

The access requested is not permitted by the operating system for the specified file handle, such as when access is Write or ReadWrite and the file handle is set for read-only access.

FileStream assumes that it has exclusive control over the handle. Reading, writing, or seeking while a FileStream is also holding a handle could result in data corruption. For data safety, call Flush before using the handle, and avoid calling any methods other than Close after you are done using the handle. Alternately, read and write to the handle before calling this FileStream constructor.

FileShare.Read is the default for those FileStream constructors without a FileShare parameter.

Caution noteCaution:

When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown.

For a list of common I/O tasks, see Common I/O Tasks.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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