N.SourceGenerators.UnionTypes 0.3.0

There is a newer version of this package available.
See the version list below for details. 
dotnet add package N.SourceGenerators.UnionTypes --version 0.3.0
                    


                    

                
NuGet\Install-Package N.SourceGenerators.UnionTypes -Version 0.3.0
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. 
<PackageReference Include="N.SourceGenerators.UnionTypes" Version="0.3.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="N.SourceGenerators.UnionTypes" Version="0.3.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="N.SourceGenerators.UnionTypes" />
                    


                            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 N.SourceGenerators.UnionTypes --version 0.3.0
                    


                    

                
#r "nuget: N.SourceGenerators.UnionTypes, 0.3.0"
#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 N.SourceGenerators.UnionTypes@0.3.0
#: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=N.SourceGenerators.UnionTypes&version=0.3.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=N.SourceGenerators.UnionTypes&version=0.3.0
                    


                            Install as a Cake Tool

N.SourceGenerators.UnionTypes

Discriminated union type source generator

Motivation

C# doesn't support discriminated unions yet. This source generator helps automate writing union types.

Using

Add package reference to N.SourceGenerators.UnionTypes

dotnet add package N.SourceGenerators.UnionTypes

Create a partial class that will be used as a union type

public partial class FooResult
{
}

Add types you want to use in a discriminated union

public record Success(int Value);
public record ValidationError(string Message);
public record NotFoundError;

public partial class FooResult
{
}

Add N.SourceGenerators.UnionTypes.UnionTypeAttribute to a union type.

using N.SourceGenerators.UnionTypes;

public record Success(int Value);
public record ValidationError(string Message);
public record NotFoundError;

[UnionType(typeof(Success))]
[UnionType(typeof(ValidationError))]
[UnionType(typeof(NotFoundError))]
public partial class FooResult
{
}

Examples

All examples can be found in examples project

Implicit conversion

public FooResult ImplicitReturn()
{
    // you can return any union type variant without creating FooResult
    return new NotFoundError();
}

Explicit conversion

public ValidationError ExplicitCast(FooResult result)
{
    return (ValidationError)result;
}

Match method forces you to handle all possible variations

public IActionResult MatchMethod(FooResult result)
{
    return result.Match<IActionResult>(
        success => new OkResult(),
        validationError => new BadRequestResult(),
        notFoundError => new NotFoundResult()
    );
}
There are no supported framework assets in this package.

Learn more about Target Frameworks and .NET Standard.

  • .NETStandard 2.0

    • No dependencies.

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
0.28.2 332 2/12/2026
0.28.2-rc.65 63 1/30/2026
0.28.1 6,082 12/15/2025
0.28.1-rc.63 182 12/14/2025
0.28.0 30,381 5/2/2024
0.28.0-rc.61 119 5/2/2024
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0.27.0 1,804 3/19/2024
0.27.0-rc.58 146 3/19/2024
0.27.0-rc.57 163 3/13/2024
0.26.0 66,370 10/26/2023
0.26.0-rc.55 150 11/16/2023
0.26.0-rc.53 163 10/30/2023
0.26.0-rc.52 130 10/30/2023
0.26.0-rc.51 143 10/30/2023
0.26.0-rc.50 123 10/30/2023
0.26.0-rc.48 171 10/26/2023
0.25.3 457 10/18/2023
0.25.3-rc.41 146 10/18/2023
0.3.0 574 1/15/2023
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