Unio.AspNetCore 1.2.1

.NET 9.0 This package targets .NET 9.0. The package is compatible with this framework or higher.

Requires NuGet 2.12 or higher.

dotnet add package Unio.AspNetCore --version 1.2.1
                    


                    

                
NuGet\Install-Package Unio.AspNetCore -Version 1.2.1
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="Unio.AspNetCore" Version="1.2.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Unio.AspNetCore" Version="1.2.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Unio.AspNetCore" />
                    


                            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 Unio.AspNetCore --version 1.2.1
                    


                    

                
#r "nuget: Unio.AspNetCore, 1.2.1"
#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 Unio.AspNetCore@1.2.1
#: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=Unio.AspNetCore&version=1.2.1
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Unio.AspNetCore&version=1.2.1
                    


                            Install as a Cake Tool

Unio.AspNetCore

ASP.NET Core integration for Unio discriminated unions.

Targets .NET 9, .NET 10 and .NET 11 RC1. Supports unions with 2–9 branches.

Native AOT

The package enables IsAotCompatible. For response bodies, pass a source-generated JSON context:

using System.Text.Json.Serialization;
using Unio;
using Unio.AspNetCore.MinimalApi;
using Unio.Types;

var builder = WebApplication.CreateSlimBuilder(args);
var app = builder.Build();
app.MapGet("/users/{id:int}", (int id) =>
{
    Unio<User, NotFound> result = id == 1 ? new User(1, "Ada") : new NotFound();
    return result.ToHttpResult(ApiJsonContext.Default);
});
app.Run();

public sealed record User(int Id, string Name);

[JsonSerializable(typeof(User))]
internal partial class ApiJsonContext : JsonSerializerContext;

Enable <PublishAot>true</PublishAot> in the application project and publish for a concrete runtime identifier. The context must contain every possible response body type, including concrete derived types. Marker responses and null values do not require JSON metadata; null produces an empty 200 response. Missing metadata throws NotSupportedException rather than falling back to reflection.

Alternatively, register the context through ConfigureHttpJsonOptions and use the existing parameterless ToHttpResult() overload. AOT applications must provide JSON metadata through one of these paths.

VerifyReferenceAotCompatibility is disabled only for this extension because Microsoft.AspNetCore.App references framework assemblies that lack AOT metadata. AOT/trim analyzers remain enabled. The runnable example validates native JSON execution in CI.

Minimal API Integration

Automatically maps Unio<...> types containing known marker types to HTTP status codes:

using Unio.AspNetCore.MinimalApi;

app.MapGet("/users/{id}", (int id, IUserService svc) =>
{
    Unio<User, NotFound, Forbidden> result = svc.GetUser(id);
    return result.ToHttpResult(); // User→200, NotFound→404, Forbidden→403
});

Convention Mapping

Marker Type HTTP Status
BadRequest 400
Unauthorized 401
Forbidden 403
NotFound 404
Conflict 409
Created 201
Accepted 202
NoContent 204
(other) 200 OK
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.  net11.0 is compatible. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.2.1 103 10/4/2026
1.0.4 202 3/31/2026
1.0.2 136 3/30/2026
0.7.28 144 3/3/2026