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

Initializes a new non-resizable instance of the MemoryStream class based on the specified region of a byte array, with the CanWrite property set as specified.

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

public MemoryStream(
	byte[] buffer,
	int index,
	int count,
	bool writable
)

Parameters

buffer
Type: System.Byte[]

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

index
Type: System.Int32

The index in buffer at which the stream begins.

count
Type: System.Int32

The length of the stream in bytes.

writable
Type: System.Boolean

The setting of the CanWrite property, which determines whether the stream supports writing.

ExceptionCondition
ArgumentNullException

buffer is null.

ArgumentOutOfRangeException

index or count are negative.

ArgumentException

The buffer length minus index is less than count.

The CanRead and CanSeek properties are both set to true. 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 if writable is true.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, 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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