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MemoryMappedFile.OpenExisting Method (String, MemoryMappedFileRights)

Opens an existing memory-mapped file that has the specified name and access rights in system memory.

Namespace:  System.IO.MemoryMappedFiles
Assembly:  System.Core (in System.Core.dll)
public static MemoryMappedFile OpenExisting(
	string mapName,
	MemoryMappedFileRights desiredAccessRights


Type: System.String

The name of the memory-mapped file to open.

Type: System.IO.MemoryMappedFiles.MemoryMappedFileRights

One of the enumeration values that specifies the access rights to apply to the memory-mapped file.

Return Value

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

mapName is an empty string.


mapName is null.


desiredAccessRights is not a valid MemoryMappedFileRights enumeration value.


The file specified for mapName does not exist.

.NET Framework

Supported in: 4.5.1, 4.5, 4

.NET Framework Client Profile

Supported in: 4

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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