This document summarizes .NET Core 3.0 and new features in C# 8.0. It discusses side-by-side deployment and converting desktop apps in .NET Core 3.0. For C# 8.0, it outlines nullable reference types, asynchronous streams/iterators/dispose, default interface implementations, extension everything, records, and discriminated unions. It also notes lower probability features like struct readonly members, dictionary literals, and UTF8 literals.

1. .NET CORE 3.0
&
C# 8.0
Cihan YAKAR
cihanyakar@gmail.com

2. CORE 3.0
• Side-by-side and App-local Deployment
• Easily convert existing Desktop
applications to .Net Core 3
• Improvement to Project Files
• Continue to support Controls, NuGet
Packages, and Existing Assembly
References

3. CORE 3.0

4. CORE 3.0
DEMO

5. GEÇMEYE ENGEL VAR MI?

6. GEÇMEYE ENGEL VAR MI?

7. KISAYOLLAR
• .net core 3.0 daily builds
• https://github.com/dotnet/core/blob/master
/daily-builds.md
• .NET Core 3.0 Portability Analyzer
• https://github.com/Microsoft/dotnet-
apiport-ui/

8. 8.0 YÜKSEK OLASILIK
• Nullable reference types
• Asynchronous Streams & Iterators &
dispose
• Default interface implementations
• Extension everything
• Records
• Discriminated unions
• Params Span

9. object reference
not set to an
instance of an
object

10. NULLABLE REFERENCE TYPES
public string Run(string? p1, string p2)
{
return p1 + p2;
}

11. ASYNCHRONOUS STREAMS & ITERATORS &
DISPOSE
foreach await(var s in objects) {
}
using await…

12. DEFAULT INTERFACE IMPLEMENTATIONS
public interface IDefaultInterfaceMethod
{
public void DefaultMethod() =>
Console.WriteLine("Merhaba");
}
public class AnyClass : IDefaultInterfaceMethod
{
}

13. EXTENSION EVERYTHING
extension NesneExtension extends Nesne
{
}

14. RECORDS
class Person(int age, string Name, string Surname)

15. DİSCRİMİNATED UNİONS
class Sekil { }
class Ucgen : Sekil { }
class Besgen : Sekil { }
public int A(Sekil sekil)
{
return sekil switch {
Ucgen u => 3,
Besgen b => 5
}
}

16. PARAMS SPAN
public string Run(params Span<string> a)
{
return string.Join('-', a);
}

17. 8.0 DÜŞÜK OLASILIK
• Struct readonly members
• Dictionary Literals
• UTF8 Literals
• Static local functions
• Implicitly scoped using statement
• &&= and ||= assignment operators

18. STRUCT READONLY MEMBERS
struct Kare
{
public int X;
readonly int Alan()
{
X = 2; // HATA
return X * X;
}
}

19. DICTIONARY LITERALS
var x = new Dictionary<string, int>() { { "foo", 4 }, { "bar", 5 } };
var y = new Dictionary<string, int>() { ["foo"] = 4, ["bar"] = 5 };
var z = ["foo":4, "bar": 5];

20. 8.0 DÜŞÜK OLASILIK
• Struct readonly members
• Dictionary Literals
• UTF8 Literals
• Static local functions
• Implicitly scoped using statement
• &&= and ||= assignment operators

21. TEŞEKKÜRLER