fl-shared-utils-mappers 0.2.1

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package fl-shared-utils-mappers --version 0.2.1
                    


                    

                
NuGet\Install-Package fl-shared-utils-mappers -Version 0.2.1
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="fl-shared-utils-mappers" Version="0.2.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="fl-shared-utils-mappers" Version="0.2.1" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="fl-shared-utils-mappers" />
                    


                            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 fl-shared-utils-mappers --version 0.2.1
                    


                    

                
#r "nuget: fl-shared-utils-mappers, 0.2.1"
#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 fl-shared-utils-mappers@0.2.1
#: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=fl-shared-utils-mappers&version=0.2.1
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=fl-shared-utils-mappers&version=0.2.1
                    


                            Install as a Cake Tool

Fl.Shared.Utils.Mappers

Shared mapper library for .NET web applications. Provides generic mapping abstractions and a ready-made implementation that converts functional types (Option, Error) into ASP.NET Core IResult HTTP responses.

Project structure

Fl.Shared.Utils.Mappers/
├── IMapper.cs
├── IApiResultMapper.cs
└── DataHttpContentMapper.cs

Interfaces

IMapper<T1, T2>

Generic mapping contract between two types.

public interface IMapper<in T1, out T2>
{
    T2 Map(T1 item);
}

Use this interface to define any single-direction mapping between an input type T1 and an output type T2.

IApiResultMapper<T>

Specialisation of IMapper for mapping API results to ASP.NET Core IResult. Combines two mapping contracts:

  • IMapper<Option<T>, IResult> — maps an optional value to an HTTP response
  • IMapper<Error, IResult> — maps a functional error to an HTTP response
public interface IApiResultMapper<T> :
    IMapper<Option<T>, IResult>,
    IMapper<Error, IResult>
{ }

Implementations

DataHttpContentMapper<T>

Default implementation of IApiResultMapper<T>. Maps Option<T> and Error values to JSON IResult responses with appropriate HTTP status codes.

Input HTTP status Response body
Option<T>.Some(value) 200 OK JSON-serialised value
Option<T>.None 404 Not Found { "message": "Not Found" }
Error 500 Internal Server Error { "message": "Internal Server Error" }

Error responses use ErrorResponse (from Fl.Shared.Utils.Components.Web.Models) with the reason phrase derived from the HTTP status code.

Usage
// Register in DI
services.AddSingleton<IApiResultMapper<MyDto>, DataHttpContentMapper<MyDto>>();

// Use in a minimal API endpoint
app.MapGet("/items/{id}", async (int id, IApiResultMapper<MyDto> mapper, IMyService service) =>
{
    Option<MyDto> result = await service.GetById(id);
    return mapper.Map(result);
});

Tests

Unit tests are located in tests/Fl.Shared.Utils.Mappers.Tests and cover:

Class under test Scenarios
DataHttpContentMapper<T> Error input → 500 JSON with "Internal Server Error"
DataHttpContentMapper<T> Option.None input → 404 JSON with "Not Found"
DataHttpContentMapper<T> Option.Some(value) input → 200 JSON with the original value

Main dependencies

  • LanguageExt — functional types (Option, Error)
  • Microsoft.AspNetCore.App — IResult, Results, StatusCodes
  • Fl.Functional.Utils — functional utilities (Map, etc.)
  • Fl.Shared.Utils.Components.Web.Models — ErrorResponse
Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  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

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Version Downloads Last Updated
0.2.1 158 4/30/2026
0.2.0 258 3/1/2026
0.1.0 110 3/1/2026