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

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


Type: System.Byte[]

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

Type: System.Int32

The index in buffer at which the stream begins.

Type: System.Int32

The length of the stream in bytes.

Type: System.Boolean

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

Exception Condition

buffer is null.


index or count are negative.


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.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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