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MemoryMappedFile.CreateOrOpen Method (String, Int64)

Creates or opens a memory-mapped file that has the specified capacity in system memory.

Namespace:  System.IO.MemoryMappedFiles
Assembly:  System.Core (in System.Core.dll)

public static MemoryMappedFile CreateOrOpen(
	string mapName,
	long capacity
)

Parameters

mapName
Type: System.String

A name to assign to the memory-mapped file.

capacity
Type: System.Int64

The maximum size, in bytes, to allocate to the memory-mapped file.

Return Value

Type: System.IO.MemoryMappedFiles.MemoryMappedFile
A memory-mapped file that has the specified name and size.

ExceptionCondition
ArgumentException

mapName is an empty string.

ArgumentNullException

mapName is null.

ArgumentOutOfRangeException

capacity is greater than the size of the logical address space.

-or-

capacity is less than or equal to zero.

Use this method to create or open a memory-mapped file that is not persisted (that is, not associated with a file on disk), which you can use to share data between processes.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

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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