Arlecchino.Atoms.History 2026.9.3

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package Arlecchino.Atoms.History --version 2026.9.3
                    


                    

                
NuGet\Install-Package Arlecchino.Atoms.History -Version 2026.9.3
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="Arlecchino.Atoms.History" Version="2026.9.3" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Arlecchino.Atoms.History" Version="2026.9.3" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Arlecchino.Atoms.History" />
                    


                            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 Arlecchino.Atoms.History --version 2026.9.3
                    


                    

                
#r "nuget: Arlecchino.Atoms.History, 2026.9.3"
#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 Arlecchino.Atoms.History@2026.9.3
#: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=Arlecchino.Atoms.History&version=2026.9.3
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Arlecchino.Atoms.History&version=2026.9.3
                    


                            Install as a Cake Tool

Arlecchino

NuGet Downloads Build Target frameworks

Undo and redo for Arlecchino.Core atoms.

An atom in Arlecchino.Core holds a value, tells what reads it, and forgets what it held. The atoms here are the same atoms with their changes written down, so an application can walk them back:

public sealed class SettingsStore : ArlecchinoAsyncStore
{
    private const string HistoryKey = "Settings";

    public HistoryAtom<string> Server { get; } = new("127.0.0.1", $"{HistoryKey}.Server");
    public HistoryAtom<decimal> Port { get; } = new(40000, $"{HistoryKey}.Port");
    public Atom<string> Filter { get; } = new("");   // not on the stack, and not meant to be
}

Turn it on where the container is built:

builder.Services.UseHistory(options => options.FileName = "session.undo");

AtomHistory collects the steps, one per application. Naming a file is what asks for one, and a file is kept in order to be come back to: HistoryFile writes the steps beside the program, one step per line, the file outlives the run, and the next one indexes it, adds to it, and starts every named atom holding what it last saw that atom hold. Left unnamed, the history is kept in memory for as long as the process runs.

Memory holds the last Capacity steps. Older ones live in the file and are seeked to one at a time when an undo asks for them, so a long history costs an offset and a length per step rather than its values.

The second argument names the atom, and is how a step written by an earlier run finds its atom in this one. It is written in full rather than worked out from the code around it, so that renaming a class or a property does not quietly orphan a history that was kept.

A name stands for one piece of state: claiming it again with the same kind of atom takes the slot over, which is what a screen's store rebuilt on the way back relies on, while claiming it with another kind is refused.

Nothing here is needed to use atoms, and Arlecchino does not reference this package: without UseHistory nothing records a step, and the atoms that could feed a history allocate nothing for one.

Product Compatible and additional computed target framework versions.
.NET 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 was computed.  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. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

Showing the top 1 NuGet packages that depend on Arlecchino.Atoms.History:

Package Downloads
Arlecchino.Testing

Headless test host for Arlecchino applications: a fake terminal, key and mouse input, and frames captured as plain text.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
2026.9.3 110 9/19/2026
2026.9.2 116 9/11/2026
2026.9.1 116 9/11/2026
2026.8.6 121 8/28/2026

What changed in this version: https://github.com/The1fEst/Arlecchino/blob/master/CHANGELOG.md#202693