Rop.OneOfExtension.Annotations 1.0.2

.NET Standard 2.0
dotnet add package Rop.OneOfExtension.Annotations --version 1.0.2
NuGet\Install-Package Rop.OneOfExtension.Annotations -Version 1.0.2
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="Rop.OneOfExtension.Annotations" Version="1.0.2" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Rop.OneOfExtension.Annotations --version 1.0.2
#r "nuget: Rop.OneOfExtension.Annotations, 1.0.2"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install Rop.OneOfExtension.Annotations as a Cake Addin
#addin nuget:?package=Rop.OneOfExtension.Annotations&version=1.0.2

// Install Rop.OneOfExtension.Annotations as a Cake Tool
#tool nuget:?package=Rop.OneOfExtension.Annotations&version=1.0.2



Rop.OneOfExtensionGenerator is a source generator solution to use OneOf variables with static extension classes


Interfaces to decorate the static helper classes as a class with OneOf methods.

    public class OneOfExtensionAttribute:Attribute
    public class OneOfSplitAttribute:Attribute


OneOfExtension decorate the static partial class OneOfSplit decorate the OneOf Methods to split in final methods (one for each oneof generic type )


The source generator that create the helper methods. Must be included as:

  • OutputItemType="Analyzer"
  • ReferenceOutputAssembly="false"


An example to test the generator.

  1. Create a partial static class decorated as "OneOfExtension" and with private methods with first type as "this OneOf<A,B,...>"
    public static partial class MyHelper{
        private static string _WriteValueABC(this OneOf<A, B, C> abc)
            return abc.Match(a => a.WriteValueA, b => b.WriteValueB, c => c.WriteValueC);
        private static string _WriteValueAB(this OneOf<A, B> ab)
            return ab.Match(a => a.WriteValueA, b => b.WriteValueB);
  1. Source Generator create Proxy Methods as public static methods for each generic type in the "OneOf" parameter
// Autogenerated code for spliting OneOf Extensions
using OneOf;
using Rop.OneOfExtension.Annotations;
namespace Test.OneOfExtensionGenerator
	public static partial class MyHelper
		public static string WriteValueABC(this A abc)
			return _WriteValueABC(abc);
		public static string WriteValueABC(this B abc)
			return _WriteValueABC(abc);
		public static string WriteValueABC(this C abc)
			return _WriteValueABC(abc);
		public static string WriteValueAB(this A ab)
			return _WriteValueAB(ab);
		public static string WriteValueAB(this B ab)
			return _WriteValueAB(ab);
  1. Use new extensions methods
var a=new A();
var b=new B();
var c=new C();

(C)2022 Ramón Ordiales Plaza

Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net461 net462 net463 net47 net471 net472 net48
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • .NETStandard 2.0

    • No dependencies.

NuGet packages (2)

Showing the top 2 NuGet packages that depend on Rop.OneOfExtension.Annotations:

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Version Downloads Last updated
1.0.2 168 2/21/2022