Danom

Danom provides Option and Result types for C#, inspired by F#. It’s designed to be easy to use, efficient, and compatible with existing C# codebases. These types offer a type-safe way to represent nullable values and expected errors, while also supporting a fluent API (e.g., map, bind) for chaining operations and value transformations.

Key Features

• Implementation of common monads: Option and Result.
• Exhaustive matching to prevent null reference exceptions.
• Fluent API for chaining operations, including async support.
• Built-in error handling with ResultErrors.
• An API for parsing strings into .NET primitives and value types.
• Input validation via Danom.Validation.
• Integration with ASP.NET MVC and ASP.NET Minimal API.

Design Goals

• Provide a safe and expressive way to handle nullable values.
• Efficient implementation to minimize overhead.
• Enforce exhaustive matching.
• Enhance functional programming in C#.
• Opionated monads to encourage consistent use.
• Support for both synchronous and asynchronous operations.
• netstandard2.1 compatible.

Getting Started

Install the Danom NuGet package:

dotnet add package Danom OR PM> Install-Package Danom

Input Validation

One of the places the Result type really shines is input validation. It's a natural step in most workflows to validate input data before processing it, and the Result type is a great way to handle this. The Danom.Validation library provides an API for defining validation rules and checking input data against those rules, returning a Result<T, ResultErrors> that contains either the validated data or an error message.

Integrations

Since Danom introduces types that are most commonly found in your model and business logic layers, external integrations are not only inevitable but required to provide a seamless experience when building applications.

These are completely optional, but provide a great way to integrate Danom with your codebase.

ASP.NET Core MVC & Razor Pages Integration

Danom is integrated with ASP.NET Core MVC (and Razor Pages) via Danom.Mvc. This library provides a set of utilities to help integrate the core types with common tasks in ASP.NET Core MVC applications.

ASP.NET Core Minimal API Integration

Danom is integrated with ASP.NET Core Minimal API via Danom.MinimalApi. This library provides a set of utilities to help integrate the core types with common tasks in ASP.NET Core Minimal API applications.

Find a bug?

There's an issue for that.

License

Licensed under MIT.