Open source buffet for .NET developers

Andrei MarukovichLunarFrog.comtwitter: @amarukovich

.NET Open Source community• 56k C# repositories on GitHub• For comparison: 200K Java, 130K Ruby, 22K

Go• .NET Foundation• Promotes .NET-related open source

technologies• 40+ projects including MSBuild, Roslyn, WCF,

Rx.NET, .NET Core and ASP.NET Core• Visual Studio encourages use of OSS• Installs Node.js, Cordova, Git; Python

extension• Default templates use 3rd party libraries

Contributing to OSS

http://up-for-grabs.net

• Licensing • Health of the project• Library version tracking• Many similar libraries, which to use?

Open Source software concerns

Licensing• Always check license• Absence of a license generally means

that default copyright laws apply

Project health and maintainability• Risks• Maintainer abandoned the project • Breaking changes in the new version

• Mitigations• Fork and maintain by yourself• Use isolation layer between 3rd party library

and your code

How to control usage of OSS?• Use central repository for all open source

libraries• Klondike• MyGet, ProGet • Nexus• Artifactory

• No official NuGet package? Create your own.• Configure NuGet to use your repository

Nexus

Projects

NetMQ Distributed messaging with many connection patterns

Polly Transient exception handling using policies

AutoMapper A convention-based object-object mapper

Jil Fast JSON (De)Serializer

FluentMigrator Database schema migrations

Serilog Structured event logging

Moq Mocking framework

HtmlAgilityPack Parser for the real-world malformed HTML

NetMQDistributed messaging

NetMQ• GNU Lesser General Public License v.3• nuget.org/packages/NetMQ/

• A 100% native C# port of the ZeroMQ, a lightweight high performance messaging library• In-process, inter-process, TCP, and

multicast• Allow to build various patterns• Pub-sub, load balancing, request-reply and

others

NetMQ sockets• RequestSocket• ResponseSocket• PublisherSocket• SubscriberSocket• DealerSocket• RouterSocket• PushSocket• PullSocket• PairSocket

Patterns

PollyTransient exception handling

Polly• New BSD License• nuget.org/packages/polly

• Use policies to simplify exception handling

AutoMapperObject-object mapper

AutoMapper• Custom permissive license• automapper.org

• Transforms object of one type to object of another type

SerilogStructured event logging

Serilog• Apache 2.0 License• serilog.net

• Structured event logging

FluentMigratorDatabase schema migrations

FluentMigrator• Apache 2.0 License• nuget.org/packages/FluentMigrator

• Database migration framework for .NET

Create migrations

Use profiles to seed test data

Migrate database• Migration runners

• CLI• NAnt• MSBuild• Rake

• Command line:

JilA fast JSON serializer/deserializer

Jil• MIT license• nuget.org/packages/Jil/• Main characteristic is performance

Jil APISerialize

Deserialize

MoqMocking framework

Moq• The BSD 2-Clause License• nuget.org/packages/Moq/

• Mocking framework for .NET

Thank you!

Andrei Marukovichcontact@lunarfrog.comtwitter: @amarukovich

Also see http://lunarfrog.com/blog/categories/open-source