Dotnet Extensions

A small, focused set of C# extension methods that make every day .NET work more pleasant. Covers strings, enums, collections, objects, dates, comparisons, and exceptions. Lightweight, dependency-free, fully unit-tested.

  • Package Id: ArturRios.Extensions

Install

NuGet:

# Package Manager
Install-Package ArturRios.Extensions

# .NET CLI
dotnet add package ArturRios.Extensions

Git submodule:

# add under ./lib/ArturRios.Extensions
git submodule add https://github.com/ArturRios/dotnet-extensions lib/ArturRios.Extensions

Then reference the project from your solution:


<ProjectReference Include="lib/ArturRios.Extensions/src/ArturRios.Extensions.csproj"/>

Supported frameworks

  • .NET 10.0 (net10.0)

The library is built for modern .NET and has no external runtime dependencies.

Quick start

Add a using to bring extensions into scope and call them like any other instance method:

using ArturRios.Extensions;

var hasLower = "AbC".HasLowerChar();     // true
var hasUpper = "abc".HasUpperChar();     // false
var hasNumber = "a1b".HasNumber();       // true

var okMin = "ab".HasMinLength(2);        // true
var okMax = "abcd".HasMaxLength(3);      // false

var isEmail = "user@example.com".IsValidEmail(); // true

var cleaned = "xxvaluexx".TrimChar('x'); // "value"

var value = ((string?)null).ValueOrDefault("fallback"); // "fallback"

var numbers = new[] { 1, 2, 3 };
var printed = numbers.JoinWith(" | "); // "1 | 2 | 3"

var inSet = 2.In([0, 2, 4]);            // true
var notIn = 3.NotIn([0, 2, 4]);         // true

var at = new DateTime(2025, 12, 10, 15, 30, 45, 999).RemoveMilliseconds();
// 2025-12-10 15:30:45.000

API overview

Below is a summary of the most commonly used extension methods with short examples. See source files under src/ and unit tests under tests/ for the full list and behavior.

String extensions (StringExtensions)

  • HasLowerChar() / HasUpperChar() / HasNumber()
    • True/false checks for at least one lower/upper/digit character.
  • HasMinLength(int min) / HasMaxLength(int max)
    • Length guardrails that treat null as failing and empty as length 0.
  • IsValidEmail()
    • Practical email pattern validation.
  • TrimChar(char c)
    • Trims the given character from both ends. Safe with null.
  • ParseToBoolOrDefault(bool default) / ParseToIntOrDefault(int default)
    • Safe parsing that returns the provided default on invalid or null input.
  • ParseToObjectOrDefault<T>()
    • Parses JSON into T; returns null on invalid or empty input.
  • IsValidEnumValue<TEnum>(bool ignoreCase = true)
    • Checks if a string matches an enum name. Case-insensitive by default.
  • JoinWith(string separator = ", ") (for IEnumerable<string> and IEnumerable<object?>)
    • Concatenates elements with a separator, converting objects via ToString() and allowing null.

Enumerable extensions (EnumerableExtensions)

  • IsEmpty() / IsNotEmpty()
    • Works for any IEnumerable. Avoids materializing where possible.
  • PrintContents()
    • Writes primitive items directly and complex object properties to Console.Out. Handles null enumerable.

Enum extensions (EnumExtensions)

  • GetDescription()
    • Returns the DescriptionAttribute value for an enum member, or null when absent.

Object extensions (ObjectExtensions)

  • ToJsonStringContent()
    • Creates an HttpContent (application/json) from an object using System.Text.Json.
  • NonNullPropertiesToDictionary() / PropertiesToDictionary()
    • Reflects an object into a dictionary of property names to values, optionally skipping null values.

Generic extensions (GenericExtensions)

  • Clone<T>()
    • Safe deep clone for reference types, and value copy for value types. Returns null when the source is null.

DateTime extensions (DateTimeExtensions)

  • RemoveMilliseconds()
    • Drops milliseconds while preserving the DateTimeKind and all other components.

Comparison extensions (ComparisonExtensions)

  • In<T>(IEnumerable<T> set) / NotIn<T>(IEnumerable<T> set)
    • Membership helpers for readability.

Exception extensions (ExceptionExtensions)

  • ToLogLine(out Guid traceId)
    • Produces a single-line log string with timestamp, trace id, exception type, message, and stack trace. Throws NullReferenceException when called on null.

Usage notes

  • All methods are static extensions under the ArturRios.Extensions namespace.
  • The library prioritizes clarity and safety: methods are null-aware where it makes sense and avoid throwing on common invalid input.
  • No external dependencies; uses BCL APIs like System.Text.Json and reflection where applicable.

Contributing

  • Issues and PRs are welcome. If you plan a larger change, open an issue first with a short proposal.
  • Coding style: follow existing conventions; keep APIs small and focused.

Build, test and publish

Use the official .NET CLI to build, test and publish the project and Git for source control. If you want, optional helper toolsets I built to facilitate these tasks are available:

Versioning

Semantic Versioning (SemVer). Breaking changes result in a new major version. New methods or non-breaking behavior changes increment the minor version; fixes or tweaks increment the patch.

This project is licensed under the MIT License. A copy of the license is available at LICENSE in the repository.