• Article

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

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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)

Syntax

'Declaration
Public Sub New ( _
    buffer As Byte(), _
    index As Integer, _
    count As Integer, _
    writable As Boolean _
)

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

Parameters

  • buffer
    Type: array<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.

Exceptions

Exception Condition
ArgumentNullException

buffer is nulla null reference (Nothing in Visual Basic).
ArgumentOutOfRangeException

index or count are negative.
ArgumentException

The buffer length minus index is less than count.

Remarks

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.

Platform Notes

Silverlight for Windows Phone Silverlight for Windows Phone

 System.ArgumentNullException is thrown when trying to retrieve a MemoryStream object with a size of zero bytes from a resource file. On Windows, no exception is thrown when the length is equal to zero.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.