JasperFx.Events 2.81.0

.NET 9.0 This package targets .NET 9.0. The package is compatible with this framework or higher. 
dotnet add package JasperFx.Events --version 2.81.0
                    


                    

                
NuGet\Install-Package JasperFx.Events -Version 2.81.0
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.
For projects that support PackageReference, copy this XML node into the project file to reference the package. 

                    


                            Directory.Packages.props
                        

                    

                

                    


                            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 JasperFx.Events --version 2.81.0
                    


                    

                
#r "nuget: JasperFx.Events, 2.81.0"
#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 JasperFx.Events@2.81.0
#: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=JasperFx.Events&version=2.81.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=JasperFx.Events&version=2.81.0
                    


                            Install as a Cake Tool

JasperFx.Events

Foundational event store abstractions and projection infrastructure for the Critter Stack. Consumed by Marten (Postgres) and Polecat (SQL Server) so a projection or async-daemon scenario written against JasperFx.Events works across both products.

Provides:

  • Projections — ProjectionBase, IInlineProjection, snapshot / single-stream / multi-stream variants, and the SnapshotLifecycle enum.
  • Async daemon — AsyncShard, ISubscriptionExecution, projection lifecycle and shard role semantics.
  • Slicing & grouping — SliceGroup, EventSlice, IEventSlicer for fan-out projection topologies.
  • Event metadata — IEvent, IEventRegistry, type registry primitives.
  • Descriptors — EventStoreUsage and friends, surfaced through IEventStoreUsageSource to monitoring tools (CritterWatch).
  • Documents (JasperFx.Events.Documents) — the small document-session slice a store-agnostic consumer needs alongside the event store: IDocumentReadOperations / IDocumentWriteOperations / IDocumentSessionOperations, IDocumentSessionFactory, and async LINQ terminators over IQueryable. Seven operations, not a document store facade.

Quick start

public class OrderProjection : SingleStreamProjection
{
    public Order Create(OrderPlaced e) => new(e.OrderId, e.Total);
    public Order Apply(OrderShipped e, Order state) => state with { Shipped = true };
}

Documentation

Full docs at https://jasperfx.net.

Repo: github.com/JasperFx/jasperfx.

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

NuGet packages (29)

Showing the top 5 NuGet packages that depend on JasperFx.Events:

Package Downloads
Marten

.NET Transactional Document DB and Event Store on PostgreSQL
Weasel.Postgresql

Npgsql Helpers and Postgresql Schema Migration Tool, spin off of Marten
WolverineFx

Build Robust Event Driven Architectures with Simpler Code
Weasel.SqlServer

SqlClient Helpers and SQL Server Schema Migration Tool, spin off of Marten
Weasel.Storage

Dialect-neutral document-storage contracts (session/serializer/version-tracker/dialect seams) shared across the Critter Stack, spin off of Marten (JasperFx/marten#4821).

GitHub repositories (3)

Showing the top 3 popular GitHub repositories that depend on JasperFx.Events:

Repository Stars
JasperFx/marten
.NET Transactional Document DB and Event Store on PostgreSQL
JasperFx/wolverine
Supercharged .NET server side development!
JasperFx/weasel
Database Development Made Easy for .Net
Version Downloads Last Updated
2.81.0 0 10/5/2026
2.80.2 6,730 10/4/2026
2.80.1 142 10/4/2026
2.80.0 83 10/4/2026
2.79.2 1,466 10/2/2026
2.79.1 24,798 10/1/2026
2.79.0 445 10/1/2026
2.78.0 3,208 9/30/2026
2.77.0 326 9/30/2026
2.76.1 30,404 9/29/2026
2.76.0 46,173 9/29/2026
2.75.2 17,299 9/27/2026
2.75.1 308 9/27/2026
2.75.0 210 9/27/2026
2.74.0 91,207 9/22/2026
2.73.2 92,619 9/19/2026
2.73.1 23,664 9/17/2026
2.73.0 238 9/17/2026
2.72.0 57,402 9/15/2026
2.71.1 1,027 9/14/2026
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