The document discusses Microsoft's significant shift towards open-source with a focus on the .NET framework and various components like Roslyn and CoreCLR. It highlights Microsoft's journey, the organization of contributions, and the mixed reception of its open-source initiatives by developers. Ultimately, it reflects on the community's engagement and ongoing opportunities for contributions within the open-source ecosystem.

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