Koto.Application 0.3.0-preview.3

This is a prerelease version of Koto.Application.

dotnet add package Koto.Application --version 0.3.0-preview.3

NuGet\Install-Package Koto.Application -Version 0.3.0-preview.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="Koto.Application" Version="0.3.0-preview.3" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="Koto.Application" Version="0.3.0-preview.3" />
                    

                            Directory.Packages.props

<PackageReference Include="Koto.Application" />
                    

                            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 Koto.Application --version 0.3.0-preview.3

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: Koto.Application, 0.3.0-preview.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 Koto.Application@0.3.0-preview.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=Koto.Application&version=0.3.0-preview.3&prerelease
                    

                            Install as a Cake Addin

#tool nuget:?package=Koto.Application&version=0.3.0-preview.3&prerelease
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Koto.Application

CQRS dispatcher, pipeline behaviors, and cross-service integration abstractions for .NET microservices. Part of the Koto suite.

Install

dotnet add package Koto.Application

What's included

Type	Purpose
`ICommand` / `ICommand<TResult>`	Marker interfaces for write operations (`ICommandBase`)
`IQuery<TResult>`	Marker interface for read operations (`IQueryBase`)
`ICommandHandler<T>` / `ICommandHandler<T, TResult>`	Command handler contracts
`IQueryHandler<TQuery, TResult>`	Query handler contract
`ICqrsDispatcher`	Dispatches commands and queries to registered handlers
`IPipelineBehavior<TRequest, TResponse>`	Middleware for the CQRS pipeline
`KotoApplicationOptions`	Opt-in behavior registration (`AddLoggingBehavior()`, `AddTransactionBehavior()`, `AddBehavior(type)`)
`LoggingBehavior<,>`	Logs every command/query with timing
`TransactionBehavior<,>`	Wraps each command in a `IUnitOfWork` transaction
`IUnitOfWork`	Abstraction for committing a database transaction
`IRepository<TAgg, TId>`	Persistence contract for aggregates (pairs with `IUnitOfWork`)
`IIntegrationEvent` / `IntegrationEvent`	External event contract
`IIntegrationCommand` / `IIntegrationCommand<TResult>`	Cross-service command contract
`IIntegrationEventPublisher`	Publishes integration events (implemented in infra)
`IIntegrationCommandDispatcher`	Dispatches integration commands (implemented in infra)
`AssemblyScanning`	`GetLoadableTypes` — scan guard against `ReflectionTypeLoadException`

Usage

Register

// Handlers only — no pipeline behaviors:
builder.Services.AddKotoApplication(typeof(Program).Assembly);

// With behaviors (opt-in; registration order = execution order, first is outermost):
builder.Services.AddKotoApplication(
    o => o.AddLoggingBehavior().AddTransactionBehavior(),
    typeof(Program).Assembly);
builder.Services.AddKotoValidation(typeof(Program).Assembly); // ValidationBehavior from Koto.Validation
// Recommended order: Logging → Validation → Transaction.

Implement a command

public sealed record PlaceOrderCommand(Guid CustomerId, List<OrderItem> Items)
    : ICommand<OrderId>;

public sealed class PlaceOrderHandler : ICommandHandler<PlaceOrderCommand, OrderId>
{
    public async Task<Result<OrderId>> HandleAsync(PlaceOrderCommand cmd, CancellationToken ct)
    {
        // business logic
    }
}

Dispatch

var result = await _dispatcher.SendAsync(new PlaceOrderCommand(customerId, items), ct);

Pipeline behaviors

Behaviors are resolved against the concrete command/query type: an open-generic registration like ValidationBehavior<,> closes over PlaceOrderCommand at dispatch time, so IValidator<PlaceOrderCommand> is discovered. A behavior can also target a single request by implementing IPipelineBehavior<PlaceOrderCommand, Result<OrderId>>.

// Custom open-generic behavior:
builder.Services.AddKotoApplication(
    o => o.AddLoggingBehavior().AddBehavior(typeof(MyMetricsBehavior<,>)),
    typeof(Program).Assembly);

Design notes

IDomainEvent — internal; free to change; never crosses service boundaries.
IIntegrationEvent — external contract; versioned; published to Kafka via Wolverine.
IIntegrationCommand — fire-and-forget command to another service; IIntegrationCommand<TResult> expects a reply.

Product	Compatible and additional computed target framework versions.
.NET	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.

net10.0
- Koto.Domain (>= 0.3.0-preview.3)
- Microsoft.Extensions.DependencyInjection.Abstractions (>= 10.0.7)
- Microsoft.Extensions.Logging.Abstractions (>= 10.0.7)

NuGet packages (5)

Showing the top 5 NuGet packages that depend on Koto.Application:

Package	Downloads
Koto.Validation FluentValidation extensions for Koto: MustBeValueObject, MustBeEntity, ListMustContainNumberOfItems, and ValidationBehavior pipeline integration.	431
Koto.Messaging.Wolverine Wolverine-based implementation of Koto messaging abstractions: integration event publishing, command dispatching, Kafka consumers with idempotency, correlation propagation, and DLQ routing.	371
Koto.Infrastructure.EFCore EF Core 10 integration for Koto DDD: generic repository, strongly-typed ID converters, specification pattern, and Wolverine outbox wiring.	352
Koto.Api.FastEndpoints FastEndpoints integration for Koto: CQRS base endpoints, RFC 7807 Problem Details from Error, correlation ID middleware, and global exception handler.	319
Koto.Testing DDD-specific test helpers for Koto: fluent aggregate assertions, in-memory fake repositories, fake integration event publisher, and Result<T> AwesomeAssertions extensions.	251

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last Updated
0.3.0-preview.3	58	7/11/2026
0.3.0-preview.2	55	7/11/2026
0.3.0-preview.1	73	7/3/2026
0.2.0-preview.1	83	6/28/2026
0.1.0-preview.5	83	5/13/2026
0.1.0-preview.4	77	5/13/2026
0.1.0-preview.3	68	5/13/2026
0.1.0-preview.2	65	5/11/2026