It's a 'brave new world' or 'hell has frozen over' (depending on your point-of-view). Microsoft is the top contributor on GitHub, they have opened-sourced their entire .NET platform and gone cross-platform! In this talk we will look at what the new 'Open-Source' Microsoft actually looks like, what they've done, how they're doing it and what it all means. From new features to compiler design meetings, from TechEmpower benchmarks to increased community contributions, we will examine it all!

1. Microsoft and Open Source
a ‘brave new world’
www.mattwarren.org
@matthewwarren
Microsoft MVP 2017 - ??

2. Microsoft and Open Source
a ‘brave new world’
What happened when Microsoft
Open-Sourced EVERYTHING*
* Well, not quite everything, but pretty much all of the .NET Framework

3. Before

5. Microsoft takes .NET
Open Source
November 12th 2014

6. Wait, did that happen already?
• Roslyn
• April 2014 (Apache 2.0)
• Entity Framework
• July 2012 (Apache 2.0)
• ASP.NET MVC
• March 2012 (Apache 2.0)
• ASP.NET MVC
• April 2009 (MS-PL)
• Managed Extensibility Framework (MEF)
• August 2008 (MS-PL)
• Shared Source CLI (SSCLI), a.k.a ‘Rotor’
• March 2002 (MS SCLI)

9. Licensing

10. Licensing

11. https://blogs.msdn.microsoft.com/bethmassi/2015/02/25/understanding-net-2015/

12. CoreCLR & CoreFX
CoreCLR – Runtime or Virtual Machine
• Garbage collector
• JIT compiler
• Base .NET data types
• Many low-level classes
CoreFX - Core Libraries
• System.Collections
• System.IO
• System.Xml

13. CoreFX Labs
Future work
Span<T> (a.k.a Slices) http://adamsitnik.com/Span/
High-performance text processing

14. Cmd-Line Tooling (CLI)
λ dotnet new
Created new C# project in
C:usersmattdotnet.
λ dotnet restore
log : Restoring packages for
C:usersmattdotnetproject.json...
log : Writing lock file to disk. Path:
C:usersmattdotnetproject.lock.json
log : Restore completed in 23512ms.
λ dotnet build
Compiling dotnet for .NETCoreApp,Version=v1.1
Compilation succeeded.
0 Warning(s)
0 Error(s)
Time elapsed 00:00:01.9025293
λ dotnet run
Hello World!

15. Roslyn (C# Compiler)
C# compiler, written in C#
Can be consumed by 3rd parties
• Syntax highlighting
• Analysers
• Tooling
Language Design Discussions

16. TypeScript

17. VS Code

18. Kestrel Web Server

19. During

20. The First PR

21. Comedy PRs

22. Good
• Organisation and Process
• Never let PR’s rot
• Provide infrastructure
• Allow the community ‘in’
• ‘Getting started’ guides

23. Bad
• Some decisions made behind ‘closed doors’ (e.g. ‘project.json’)
• Microsoft still the ‘gate-keepers’
• Issues slipping through the gaps
• Naming is hard!!
• ‘ASP.NET 5’ -> ‘ASP.NET Core 1.0’
• dnx -> dotnet

24. Ugly

25. Ugly

26. After

27. Do .NET developers care?

28. Do .NET developers care?
Did going open-source make any difference?

29. The organization with the largest
number of contributors to open-
source projects over the past year on
GitHub is, surprisingly, Microsoft,
GitHub announced today.
https://octoverse.github.com/

31. Are Microsoft telling the truth?

32. Are Microsoft telling the truth?
There’s only one way to find out!!

33. async Task<SearchIssuesResult> RunQuery(GitHubClientInfo clientInfo,
string query, int pageSize, int pageNumber)
{
var issue = new SearchIssuesRequest(query);
issue.Repos.Add(clientInfo.Organisation, clientInfo.Repository);
issue.SortField = IssueSearchSort.Created;
issue.Order = SortDirection.Ascending;
issue.PerPage = pageSize;
issue.Page = pageNumber;
var result = await clientInfo.Client.Search.SearchIssues(issue);
return result;
}
C#

34. David Fowler

35. Open Source .NET – 2 years later
http://mattwarren.org/2016/11/23/open-source-net-2-years-later/

36. Do .NET developers care?
• Sustained contributions
• Not just an initial bump
• Opening issues and creating pull-requests
• Bug fixes, entire features, future ideas
• Across the entire stack
• Runtime, Class libraries, Compiler, JIT and even GC

37. What Now?

38. How do I contribute?
• Look for ‘up-for-grabs’ issues
•Easy GitHub Search
• Suggest a new feature
•Copying from Java is allowed!
•‘Compact Strings’ – CoreCLR Issues #7083
• Prototype something
• Follow a ‘Getting Started’ guide

39. Domino Chain Reaction - YouTube

41. First CoreFX PR
by Ben Adams

42. First CoreCLR
PR by
Ben Adams

43. Contributions
by some bloke
called
‘Matt Warren’

44. Will I get told to RTM?

45. Questions?
www.mattwarren.org
@matthewwarren