This document discusses the future of C# programming language. It provides an introduction to Giovanni Bassi, a C# programmer and MVP. It then lists topics that will be covered in his podcast, including Docker, .NET Core, Git, and Node.js. Charts are shown comparing the popularity and usage of C#, VB, and F# languages. The rest of the document demonstrates new features coming to C# like tuple names inference, default values for generic types, async Main method, and more.

1. w w w . l a m b d a 3 . c o m . b r
O futuro do C#

2. Giovanni Bassi
• Programador
• MVP
• Não gerente
• Trouxe a Scrum.org, PSM e PSD pro Brasil
• blog.lambda3.com.br, podcast.lambda3.com.br,
dotnetarchitects.net
• @giovannibassi
• Escalador e ciclista

4. podcast.lambda3.com.br
0 – Eventos
1 – Docker
2 – .NET Core RC2
3 – Git
4 – Estudo
5 – Open Source
6 – Xamarin
7 – Node.js
8 – Democracia organizacional
9 – O programador poliglota
...
Toda semana em:

5. stackoverflow.com/insights/survey/2017#most-popular-technologies

6. stackoverflow.com/insights/survey/2017#most-loved-dreaded-and-wanted

7. F#
10,000’s
Tens of thousands
VB
100,000’s
Hundreds of thousands
C#
1,000,000’s
Millions

8. F#
10,000’s
Tens of thousands
VB
100,000’s
Hundreds of thousands
C#
1,000,000’s
Millions

9. Demos!

10. var tuple = (f1: x.f1, f2: x?.f2);
var tuple = (x.f1, x?.f2);
https://github.com/dotnet/csharplang/blob/master/proposals/csharp-7.1/infer-tuple-names.md

11. static (int, int) Tally(int[] values) => default;
https://github.com/dotnet/csharplang/blob/master/proposals/target-typed-default.md

12. static async Task Main()
{
// await ...
}
https://github.com/dotnet/csharplang/blob/master/proposals/async-main.md

13. IAsyncEnumerable<Person> people = database.GetPeopleAsync();
foreach await (var p in people) { … }
using await (IAsyncDisposable resource = await store.GetRecordAsync(…)) { … }

14. extension Enrollee extends Person
{
// static field
static Dictionary<Person, Professor> enrollees = new Dictionary<Person, Professor>();
// instance method
public void Enroll(Professor supervisor) { enrollees[this] = supervisor; }
// instance property
public Professor Supervisor => enrollees.TryGetValue(this, out var supervisor) ? supervisor : null;
// static property
public static ICollection<Person> Students => enrollees.Keys;
// instance constructor
public Person(string name, Professor supervisor) : this(name) { this.Enroll(supervisor); }
}

15. class Person : IEquatable<Person>
{
public string First { get; }
public string Last { get; }
public Person(string First, string Last) => (this.First, this.Last) = (First, Last);
public void Deconstruct(out string First, out string Last)
=> (First, Last) = (this.First, this.Last);
public bool Equals(Person other)
=> other != null && First == other.First && Last == other.Last;
public override bool Equals(object obj) => obj is Person other ? Equals(other) : false;
public override int GetHashCode() => GreatHashFunction(First, Last);
…
}
class Person(string First, string Last);