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

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

8. Licensing

9. Licensing

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

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)
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

24. After

25. Do .NET developers care?

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

27. 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/

29. Are Microsoft telling the truth?

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

31. 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#

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

33. 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

34. Questions?
www.mattwarren.org
@matthewwarren