R3sult4Net

A lightweight Result type for .NET to model success/failure without exceptions, with support for typed results and simple functional helpers.

• Package Id: R3sult4Net
• Targets: .NET Standard 2.0 (works on .NET 6/7/8+)

Install

# via dotnet CLI
dotnet add package R3sult4Net

Quick Start

using R3sult4Net;

// Non-generic result
Result op = DoSomething();
if (op.IsFailure)
{
    Console.WriteLine($"Error: {op.Error?.Code} - {op.Error?.Description}");
}

// Generic result
Result<User> userRes = GetUser("42");
if (userRes.IsSuccess)
{
    Console.WriteLine(userRes.Value.Name);
}

// Implicit conversions
Result ok = Result.Success();
Result<User> userOk = new User("John"); // implicit Success(User)
Result<User> userErr = new Error("user.not_found", "User not found"); // implicit Failure(Error)

// Map helper (only runs on success)
var userNameRes = userRes.Map(u => u.Name);

API Overview

• Result.Success() / Result.Failure(Error)
• Result<T>.Success(T value) / Result<T>.Failure(Error)
• Properties: IsSuccess, IsFailure, Error, and on generic results Value
• Implicit conversions from T to Result<T> and from Error to Result/Result<T>
• Extension: Map<TIn,TOut>(this Result<TIn>, Func<TIn,TOut>)

Error

var err = new Error(
    code: "domain.error_code",
    description: "Something went wrong",
    domain: "DomainName",
    errors: new [] { new Error("inner.code", "Inner failure") }
);

Notes

• The library uses modern C# features; ensure your project uses a recent C# language version if needed.
• Tests target .NET 6/7/8; the library targets .NET Standard 2.0 for broad compatibility.

License

MIT