Martin Costello

An example of integration testing ASP.NET Core Minimal hosting and APIs

Logging extensions for xunit

SQL LocalDB Wrapper is a .NET library providing interop with the Microsoft SQL Server LocalDB Instance API

Extensions for Microsoft.AspNetCore.OpenApi

A sample implementation of Sign in with Apple using ASP.NET Core

Upgrades projects to a newer version of .NET

A NuGet package that provides an in-memory test server for testing AWS Lambda functions

.NET tests using Playwright

The companion site for the London Travel Amazon Alexa skill

Martin Costello's website

A GitHub Action that updates the .NET SDK

GitHub automation for my repositories.

A demonstration of different ways to add OpenAPI (Swagger) support to ASP.NET Core applications

Pseudo-localization tool for .NET

Solutions for Advent of Code in C#

Martin Costello's API

An example of writing a simple custom GitHub Action with C#

An Amazon Alexa skill for checking the status of travel in London

An application that helps manage Dependabot updates across multiple repositories.

Visualise multiple journeys from Apple Fitness on a map

A dashboard for visualising benchmark results from benchmarkdotnet-results-publisher

Sample application for integration testing ASP.NET Core applications using antiforgery protections

An example of implementing notarization for a self-contained .NET application on macOS

An example of using Polly's RateLimit policy in a ASP.NET Core Minimal API

TypeScript typings for Apple Pay JS

A GitHub Action that can resolve basic version conflicts between Git branches

.NET client for the BrowserStack Automate REST API

Sample application that uses the .NET 6 JSON source generator with Minimal APIs

A simple test implemented in .NET Core for Selenium

A GitHub Action that updates HTML static assets

A GitHub Action that publishes results from BenchmarkDotNet benchmarks to a GitHub repository

My solutions for problems on https://projecteuler.net/

Sample repository that demonstrates automated monthly patching of .NET applications

An example application that demonstrates using pseudo-localization with ASP.NET Core

Waits for a new version of a NuGet package to be published

Repository for storing benchmark results

Martin Costello's blog

A NuGet package containing reusable MSBuild targets for my other .NET projects

Samples for new features in .NET 8

GitHub automation

Content for public presentations 🛝

Samples for ASP.NET Core 7

A sandbox for playing with the crank .NET performance testing tool

Benchmarks for ASP.NET Core and OpenTelemetry

Update Hue lights to follow along with Eurovision

Demonstrates continuous benchmarking in GitHub Actions using BenchmarkDotNet

OAuth2 social authentication providers for ASP.NET Core

An opinionated, cloud ready stack for building observable, production ready, distributed applications in .NET

Scripts to setup a new computer

An application to split parts of a credit card bill between two people

Benchmarks for (de)serializing JSON using Refit

Playground repo for Amazon.Lambda.Annotations

Parses the JSON of Twitter archives

Source content for my CDN

Template repository for deploying https://github.com/martincostello/benchmarks-dashboard to GitHub Pages

🪿🏳️‍🌈

A sandbox repository for integrating Polly

Lints inline PowerShell script steps in GitHub Actions

An ASP.NET Core web application sample of a GitHub token broker using OIDC

A sample implementation of Apple Pay JS using ASP.NET Core

Martin Costello's README

This repository contains the OpenTelemetry Astronomy Shop, a microservice-based distributed system intended to illustrate the implementation of OpenTelemetry in a near real-world environment.

The Microsoft community Windows Package Manager manifest repository

A benchmark demonstrating a performance regression with .NET 10

An ASP.NET Core Minimal API example snippet using generic handlers

My dotfiles repo

The previous .NET Framework version of my personal website.

A .NET Core global tool to display and update outdated NuGet packages in a project

Demo application for my session at .NET Conf 2024

Xcode Notarize

Tidies up NuGet packages in your local NuGet package folders.

Contains custom Azure Functions

A PowerShell script that can be used by GitHub Actions to keep your .NET SDK up-to-date

An Euphoric Dummy Text/Image Generator for jQuery and Native JS

This repository contains .NET Documentation.

The OpenTelemetry .NET Client

This repository contains set of components extending functionality of the OpenTelemetry .NET SDK. Instrumentation libraries, exporters, and other components can find their home here.

Configuration for Renovate

Sandbox for testing refactoring of my NuGet publishing to use immutable releases

The Grafana Faro Web SDK, part of the Grafana Faro project, is a highly configurable web SDK for real user monitoring (RUM) that instruments browser frontend applications to capture observability signals. Frontend telemetry can then be correlated with backend and infrastructure data for full-stack observability.

Validate XML, Parse XML and Build XML rapidly without C/C++ based libraries and no callback.

OpenTelemetry .NET Automatic Instrumentation

Home of the Renovate CLI: Cross-platform Dependency Automation by Mend.io

ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.

Profiles Drilldown is a native Grafana application designed to integrate seamlessly with Pyroscope, the open-source continuous profiling platform, providing a smooth, query-less experience for browsing and analyzing profiling data.

Powerful .NET library for benchmarking

Static analysis for GitHub Actions

IdentityModel extensions for .Net

Defines standards for generating consistent, accessible telemetry across a variety of domains

Light, fluffy, and always free - The AWS Local Emulator alternative

.NET is a cross-platform runtime for cloud, IoT, and desktop apps.

gRPC for .NET

The Prometheus monitoring system and time series database.

Go libraries shared across Prometheus components and libraries.

The official AWS SDK for .NET. For more information on the AWS SDK for .NET, see our web site:

Actually Useful AI Observability

GitHub webhook events toolset for .NET

The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.

OpenSSF Scorecard - Security health metrics for Open Source

:octocat: Static checker for GitHub Actions workflow files

Runs Trivy as GitHub action to scan your Docker container image for vulnerabilities

Trace Context

Home of .NET's Virtual Monolithic Repository which includes all the code needed to build the .NET SDK.

Actually Useful AI Observability | OSS, OTel-Native, Inside Grafana

No description.

🤖 Dependabot's core logic for creating update PR's.

Repo for Security related GitHub Actions CI automation

OpenTelemetry instrumentation for JavaScript modules

Cross platform code coverage for .NET

OpenTelemetry JavaScript Client

The Windows Package Manager Manifest Creator command-line tool (aka wingetcreate)

A modern load testing tool, using Go and JavaScript

Random Testing for .NET

GitHub Action for running OSPS security assessments

No description.

Kubernetes Operator for OpenTelemetry Collector

A modern library for parsing command line arguments. While it's extremely opinionated in what it does, it tries to follow established industry conventions, and draws its inspiration from applications you use everyday.

A utility to perform design-time builds of .NET projects without having to think too hard about it.

Action for generating attestations for workflow artifacts

No description.

Dotnet profiler

Mutation testing for .NET core and .NET framework!

Core functionality needed to create .NET Core projects, that is shared between Visual Studio and CLI

Testing GitHub Actions workflows

A public-facing, centralized place to store reusable workflows used by Grafana Labs.

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model.

Continuous Profiling Platform. Debug performance issues down to a single line of code

EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.

Research EXpression Language

Make Philips Hue take the colour of the Eurovision country that's currently on

Swagger tools for documenting API's built on ASP.NET Core

OpenID 2.0 authentication middleware for ASP.NET Core

A GitHub GraphQL client library for .NET

Polly is a .NET resilience and transient-fault-handling library that allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner. From version 6.0.1, Polly targets .NET Standard 1.1 and 2.0+.

.NET news, announcements, release notes, and more!

A repository for end-to-end testing .NET Bumper

Should testing for .NET - the way Asserting *Should* be!

Extensions to the dotnet CLI to simplify the process of building and publishing .NET Core applications to AWS services

A parser/validator for a document that describes the HTTP API dependencies that an application has.

An experiment of generating a .NET API client with Kiota

Humanizer meets all your .NET needs for manipulating and displaying strings, enums, dates, times, timespans, numbers and quantities

Download ScriptAnalyzer from PowerShellGallery

Power Fx low-code programming language

C# and F# language binding and extensions to Apache Spark

The repository for components built by Microsoft for the Azure Bot Framework.

CBOR Serializers for Kiota generated API clients

Abstractions library for the Kiota generated SDKs in dotnet

Benchmarking infrastructure for applications

A light-weight message bus on top of AWS services (SNS and SQS).

Provides sample implementations of the Polly library. The intent of this project is to help newcomers kick-start their use of Polly within their own projects.

GitHub Action for continuous benchmarking to keep performance

This repository contains a suite of libraries that provide facilities commonly needed when creating production-ready applications.

OpenAPI based HTTP Client code generator

Our library for publishing metrics to statsd

Improved MSBuild editing support

No description.

Repro for dotnet/extensions#5062

Repro for dotnet/runtime#101010

Repro for dotnet/sdk#39909

Just a small program to generate the full list of C# errors and warnings

GitHub Action for creating a GitHub App Installation Access Token

Repro for dotnet/runtime#97498

No description.

Repro for dotnet/aspnetcore#51882

Repro for dotnet/sdk#36539

Repro for dotnet/runtime#93335

Repro for CS0757 issue with Microsoft.Extensions.Telemetry

xcode-select action

Xcode Import Certificate

Xcode Staple

Repro for dotnet/runtime#89010

Repro for dotnet/aspnetcore#49384

Attempt to repro App-vNext/Polly/issues/1333

Sign NuGet packages using certificates in Azure Key Vault

Create, update and deploy Nuget Packages with a GUI

No description.

Repro projects for [LibraryImport] issues

A repro demonstrating how ProblemDetails cannot be used with the JSON source generator

A .NET Core console application for testing crash handling

No description.

Repository for MongoDB University homework

Repro for issue with incorrect resource names with file-scoped namespaces

Repro for deadlock in the .NET 6 ConfigurationManager class

Repro for issue with Microsoft.ICU.ICU4C.Runtime with .NET 6

No description.

Repro for issue with Minimal Actions and Html.ActionLink()

Repro for issue with using coverlet with Refit 6.

Repro for https://github.com/aspnet/AspNetCore/issues/6415

No description.

Repro for https://github.com/aspnet/Extensions/issues/1691

Benchmarks comparing ASP.NET performance with the console logger

Repro for https://github.com/aspnet/AspNetCore/issues/11246

A simple validation project to ensure xUnit.net AppVeyor support is working as expected.

Repository containing a repro for xunit test output being missing

Repro for [InlineData(Skip = "Skip")] not working in xunit

A repro for not being able to compile satellite resource assemblies for Windows' pseudo-locales

Has the British Government collapsed yet?

Yeoman generator for ASP.NET Core OAuth2 social providers

A polyfill for Apple Pay JS