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MemoryStream.MemoryStream(Byte[], Int32, Int32) Constructor

Initializes a new non-resizable instance of the MemoryStream class based on the specified region (index) of a byte array.

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

public MemoryStream (
	byte[] buffer,
	int index,
	int count
)
public MemoryStream (
	byte[] buffer, 
	int index, 
	int count
)
public function MemoryStream (
	buffer : byte[], 
	index : int, 
	count : int
)
Not applicable.

Parameters

buffer

The array of unsigned bytes from which to create this stream.

index

The index into buffer at which the stream begins.

count

The length of the stream in bytes.

Exception typeCondition

ArgumentNullException

buffer is a null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

index or count is less than zero.

ArgumentException

The sum of index and count is greater than the length of buffer.

For an example of creating a file and writing text to a file, see Writing Text to a File. For an example of reading text from a file, see Reading Text from a File. For an example of reading from and writing to a binary file, see Reading and Writing to a Newly Created Data File.

The CanRead, CanSeek, and CanWrite properties are all set to true, but the capacity cannot be changed. Capacity is set to count.

The length of the stream cannot be set to a value greater than the initial length of the specified byte array; however, the stream can be truncated (see SetLength).

This constructor does not expose the underlying stream. GetBuffer throws UnauthorizedAccessException. However, you can write to the stream.

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, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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