Testably.Abstractions.MemoryMappedFiles 7.0.1

Prefix Reserved
.NET 6.0 This package targets .NET 6.0. The package is compatible with this framework or higher. .NET Standard 2.0 This package targets .NET Standard 2.0. The package is compatible with this framework or higher. 
dotnet add package Testably.Abstractions.MemoryMappedFiles --version 7.0.1
                    


                    

                
NuGet\Install-Package Testably.Abstractions.MemoryMappedFiles -Version 7.0.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Testably.Abstractions.MemoryMappedFiles" Version="7.0.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Testably.Abstractions.MemoryMappedFiles" Version="7.0.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Testably.Abstractions.MemoryMappedFiles" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Testably.Abstractions.MemoryMappedFiles --version 7.0.1
                    


                    

                
#r "nuget: Testably.Abstractions.MemoryMappedFiles, 7.0.1"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Testably.Abstractions.MemoryMappedFiles@7.0.1
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Testably.Abstractions.MemoryMappedFiles&version=7.0.1
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Testably.Abstractions.MemoryMappedFiles&version=7.0.1
                    


                            Install as a Cake Tool

Testably.Abstractions.MemoryMappedFiles

Nuget Build Quality Gate Status Coverage

Memory-mapped file extensions for Testably.Abstractions - adds the methods from System.IO.MemoryMappedFiles.MemoryMappedFile to IFileSystem, so memory-mapped-file code can be tested against the in-memory MockFileSystem.

dotnet add package Testably.Abstractions.MemoryMappedFiles

IFileSystem fileSystem; // injected

using IMemoryMappedFile mappedFile = fileSystem.MemoryMappedFile
    .CreateFromFile("data.bin");

using IMemoryMappedViewAccessor accessor = mappedFile.CreateViewAccessor();
accessor.Write(0, 42);
int value = accessor.ReadInt32(0);

The abstraction is exposed as the extension property fileSystem.MemoryMappedFile (note: no ()), returning an IMemoryMappedFileFactory. On RealFileSystem every call forwards to the underlying base class library (BCL) implementation; on MockFileSystem the views are built directly over the in-memory file bytes.

Some parts of the BCL surface are intentionally not abstracted, because they have no meaningful in-memory equivalent:

  • CreateNew, CreateOrOpen and OpenExisting operate on operating-system shared memory (named or anonymous) rather than a file. They forward normally on RealFileSystem, but throw NotSupportedException on MockFileSystem.
  • The SafeMemoryMappedFileHandle / SafeMemoryMappedViewHandle handle and pointer APIs, as well as the SafeFileHandle-based CreateFromFile overload, are not exposed at all (mirroring how the SafeFileHandle-based FileStream construction is excluded elsewhere).

On MockFileSystem the reads and writes, their capacity handling and the thrown exceptions mirror the real MemoryMappedViewAccessor / MemoryMappedViewStream. Two details tied to operating-system memory mapping are intentionally simplified: a view created without an explicit size has a Capacity of exactly the remaining bytes (the real file system rounds up to the system page size), and PointerOffset is always 0.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 is compatible. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
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Version Downloads Last Updated
7.0.1 38 7/14/2026
7.0.0 54 7/13/2026
7.0.0-pre.2 51 7/13/2026