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FileStream Constructor (SafeFileHandle, FileAccess, Int32, Boolean)

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
)

Parameters

handle
Type: Microsoft.Win32.SafeHandles.SafeFileHandle
A file handle for the file that this FileStream object will encapsulate.
access
Type: System.IO.FileAccess
A constant that gets the CanRead and CanWrite properties of the FileStream object.
bufferSize
Type: System.Int32
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
Type: System.Boolean
true if the handle was opened asynchronously (that is, in overlapped I/O mode); otherwise, false.

ExceptionCondition
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, such as a disk error, occurred.

-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.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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