How do I contribute to the .NET Runtime source code?

Start by checking the 'Help Wanted' and 'Good First Issue' labels on GitHub, then follow the workflow instructions for building and testing. The README also links to contribution guidelines and a Discord server for discussions.

What's the difference between .NET Runtime and .NET Framework?

.NET Runtime is cross-platform and open-source, powering modern .NET versions, while .NET Framework is Windows-only and legacy. Migration tools and documentation are available for porting applications.

How to report a security bug in .NET?

Security issues should be reported privately to the Microsoft Security Response Center via the MSRC Researcher Portal, with a response expected within 24 hours, as detailed in the README.

Is .NET Runtime suitable for IoT development?

Yes, it supports various IoT devices and platforms, but for extremely resource-constrained environments, alternatives like .NET Nano Framework might be more appropriate due to its smaller footprint.

How to get nightly builds of .NET Runtime for testing?

Use the 'Dogfooding .NET' guide in the documentation to install nightly builds and test them in your projects, which helps in identifying issues early.

.NET Runtime vs Java runtime: which is better for cloud applications?

Both are robust, but .NET Runtime offers deep integration with Microsoft Azure and a modern async programming model, while Java has a larger ecosystem. The choice depends on team expertise and existing infrastructure.

Open-Awesome

Microsoft.Extensions.DependencyInjection

MITC#v11.0.0-preview.4.26230.115

The open-source runtime and libraries for .NET, enabling cross-platform development for cloud, mobile, desktop, and IoT applications.

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What is Microsoft.Extensions.DependencyInjection?

.NET Runtime is the core execution engine and library foundation for the .NET platform, enabling developers to build and run applications across cloud, mobile, desktop, and IoT environments. It provides the essential components like the runtime, class libraries, and the `dotnet` host installer that manage application execution. The project solves the problem of creating high-performance, cross-platform applications with a consistent set of tools and APIs.

Target Audience

Developers building applications in C#, F#, or Visual Basic that need to run on multiple platforms (Windows, Linux, macOS, IoT). It's also for contributors interested in low-level runtime development, library design, or improving the .NET ecosystem.

Value Proposition

Developers choose .NET Runtime for its open-source nature, strong cross-platform support, and comprehensive standard libraries that reduce boilerplate code. Its integration with the broader .NET toolchain and active community provide a reliable foundation for both new projects and migrating legacy applications.

Overview

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

Use Cases

Best For

Building cross-platform web APIs and microservices for cloud deployment
Developing desktop applications with Windows Forms or WPF that need modern runtime features
Creating mobile apps using .NET MAUI or Xamarin that share business logic across iOS and Android
Implementing IoT solutions on devices running Linux or real-time operating systems
Migrating legacy .NET Framework applications to modern, cross-platform .NET
Contributing to core runtime performance improvements or library enhancements

Not Ideal For

Embedded systems with severe memory constraints where a minimal runtime like .NET Nano Framework is preferred
Rapid prototyping projects that benefit from dynamic languages like Python or JavaScript
Serverless applications requiring ultra-fast cold starts, as .NET's JIT compilation can add overhead

Pros & Cons

Pros

Cross-Platform Execution

Supports Windows, Linux, macOS, and IoT devices, enabling consistent application deployment across diverse environments as highlighted in the key features.

Open Collaboration

Community-driven development with public issue tracking, contribution guidelines, and active Discord discussions, fostering a transparent ecosystem.

Security-Focused

Features a dedicated security reporting process via the Microsoft Security Response Center with a 24-hour response time, ensuring vulnerabilities are handled promptly.

Comprehensive Tooling

Includes the shared host (`dotnet`) installer and CLI tools for managing applications and SDKs, simplifying deployment and development workflows.

Cons

Complex Contribution Workflow

Building and testing the runtime requires following detailed workflow instructions, which can be a barrier for new contributors despite 'good first issue' labels.

Vendor Influence

Heavily backed by Microsoft, which may lead to prioritization of Windows-centric features or integration with Azure services over community-driven alternatives.

Large Runtime Footprint

The full runtime and libraries can be bulky for lightweight applications, compared to more minimal runtimes available in other ecosystems.

Frequently Asked Questions

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