TomRR.Core.ResultType 0.0.2

📦 ResultType

A lightweight, expressive, and extensible result abstraction for .NET — with support for structured results, errors, and unit-only responses (like NoContent, Accepted, etc).

✨ Features

• ✅ Simple Result<TSuccess, TError> model
• ✅ Optional support for StatusOnly results
• ✅ Clean pattern matching with .Match(...)
• ✅ ASP.NET Core integration via ToActionResult()
• ✅ Easily extensible with your own unit result types

🚀 Basic Usage

Result<TSuccess, TError>

Result<int, string> Divide(int a, int b)
{
    if (b == 0)
        return "Division by zero";

    return a / b;
}

var result = Divide(10, 0);

var message = result.Match(
    success => $"Result: {success}",
    error => $"Error: {error}"
);

Result<TSuccess, TError, TStatusOnly>

Supports status-only outcomes like NoCoÍntent, Accepted, etc.

Result<string, string, NoContent> TryFindItem(bool found)
{
    if (found)
        return "Found item";

    return Result.NoContent;
}

var response = TryFindItem(false).Match(
    success => $"Found: {success}",
    error => $"Error: {error}",
    status => "No item found."
);

🌐 ASP.NET Core Integration

Add this extension to convert Result into IActionResult:

using Microsoft.AspNetCore.Mvc;

namespace ResultType.Extensions;

public static class ResultExtensions
{
    public static IActionResult ToActionResult<TValue, TError>(
        this Result<TValue, TError> result)
    {
        return result.Match<IActionResult>(
            value => new OkObjectResult(value),
            error => new BadRequestObjectResult(error)
        );
    }

    public static IActionResult ToActionResult<TValue, TError, TStatusOnly>(
        this Result<TValue, TError, TStatusOnly> result)
        where TStatusOnly : IStatusOnlyResult
    {
        return result.Match<IActionResult>(
            value => new OkObjectResult(value),
            error => new BadRequestObjectResult(error),
            statusOnly => statusOnly switch
            {
                NoContent => new NoContentResult(),
                NotModified => new StatusCodeResult(304),
                _ => new StatusCodeResult(204)
            }
        );
    }
}

✅ Controller Example

[HttpGet]
public IActionResult GetData() =>
    TryFindItem(true).ToActionResult();

🧩 Custom Unit (StatusOnly) Results

Define your own unit-only result:

[StructLayout(LayoutKind.Sequential, Size = 1)]
public readonly struct MyOwnResult : IStatusOnlyResult;

Expose it via the factory:

public static partial class Result
{
    public static MyOwnResult MyOwnResult => new MyOwnResult();
}

Use just like built-in NoContent, Created, etc.

🧰 Built-in Unit Result Types

All are defined as zero-alloc readonly struct.

📦 Installation

Install via NuGet:

dotnet add package ResultType

Or via your .csproj:

<PackageReference Include="ResultType" Version="0.0.2" />

📄 License

Licensed under the Apache License 2.0.