The document is a diary of a Java developer exploring the .NET world over 5 days. On day 1, they define the differences between .NET Framework, .NET Core, and .NET Standard. On day 2, they discuss C# as the main .NET language and compare features to Java like type inference and extensions. On day 3, they look at .NET frameworks and issues with things like pagination and dependency injection. On day 4, they discuss the growing .NET ecosystem. Finally, on day 5 they propose the idea of a JHipster-like generator for .NET called JHipster.NET that would enhance ASP.NET Core and focus on developer experience.

1. Diary of a Java dev lost in
the .Net world
LyonJug, 12/06/2019

2. Who are you?
● .Net (core)
○ C#?
● Java
○ Java?
○ Kotlin?
○ Groovy?
○ Scala?
○ Golo??
● JHipster?
● Vert.x?

3. @danielpetisme
@lavajug
@golo_lang
@vertx_project
@java_hipster
@Michelin

4. JVM

7. Day#1: The definitions

8. What the hell is .Net?

9. .Net Framework vs .Net Core vs .Net Standard

10. Day#2: The language

13. My Top3

14. https://try.dot.net

15. Data Objects
var userDto = new UserDto {
Login = "not-used",
FirstName = "firstname",
LastName = "lastname",
Email = "save-existing-email-and-login@example.com",
Activated = false,
ImageUrl = "http://placehold.it/50x50",
LangKey = Constants.DefaultLangKey,
Roles = new HashSet<string> {
RolesConstants.USER
}
};
https://try.dot.net/?fromGist=c9fa9087655d352b5a4d594bb228e948

16. Async native (1/2)
public async Task<User> CreateUser(UserDto userDto)
{
var user = new User {
UserName = userDto.Login.ToLower(),
FirstName = userDto.FirstName,
LastName = userDto.LastName,
Email = userDto.Email.ToLower(),
ImageUrl = userDto.ImageUrl,
LangKey = userDto.LangKey ?? Constants.DefaultLangKey,
PasswordHash = "..."
ResetKey = RandomUtil.GenerateResetKey(),
ResetDate = DateTime.Now,
Activated = true
};
await _userManager.CreateAsync(user);
await CreateUserRoles(user, userDto.Roles);
_log.LogDebug( $"Created Information for User: {user}");
return user;
}
https://try.dot.net/?fromGist=c9fa9087655d352b5a4d594bb228e948

17. Reactive eXtensions

18. Extensions (1/3)
https://try.dot.net/?fromGist=aa789fa70bcd0e5db2aac00018be0c5f
public static class StringExtension
{
public static string Capitalize(this string str) {
return char.ToUpper(str[0]) + str.Substring(1);
}
public static string Decorate(this string str, string decoration) => $"{decoration} {str} {decoration}";
}
public class Program
{
public static void Main()
{
Console.WriteLine("java".Capitalize());
Console.WriteLine("Java + C#".Decorate("🧡"));
}
}

19. Extensions (2/3)
public static class WebConfiguration {
public static IServiceCollection AddWebModule( this IServiceCollection @this)
{
@this.AddHttpContextAccessor();
//https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/health-checks?view=aspnetcore-2.2
@this.AddHealthChecks();
@this.AddMvc(options => {
options. ModelBinderProviders.Insert(0, new PageableBinderProvider());
})
.SetCompatibilityVersion(CompatibilityVersion. Version_2_2)
.AddJsonOptions(options => {
options. SerializerSettings.NullValueHandling = NullValueHandling. Ignore;
});
return @this;
}
}

20. Extensions (3/3)
public void ConfigureServices(IServiceCollection services)
{
services
.AddDatabaseModule( Configuration)
.AddSecurityModule()
.AddProblemDetailsModule()
.AddAutoMapperModule()
.AddWebModule()
.AddSwaggerModule();
}

21. Type inference 2007 2018
Data objects 2007 N/A
Extensions 2007 N/A
Traits 2018 2014
String Interpolation 2015 N/A
C# > Java ?

22. JVM rulezz

23. CLR ???

24. https://www.jetbrains.com/rider/

25. Day#3 Frameworks

28. “Just enough to not start from scratch,
not enough to be enterprise-friendly”

30. Issues
Action/Headers weird with HTTP APIs
Pagination
DbConcurrencyException (catch’em all)
Manual DI
Configure file Management
Audit
Testing fixtures

31. Day#4: The ecosystem

33. https://octoverse.github.com/projects#repositories

34. .Net Developper in 2019

35. 4years...
Fancy a PR?
https://github.com/aspnet/EntityFrameworkCore/issues/1368#issuecomment-473521834

36. 1999: Java Community Proccess

37. Java-ish foundations

38. .Net Foundation
��

41. Day#5: JHipster.Net

42. Generator != Framework

43. +

45. Objectives
● Enhance (Asp.Net|Entity Framework) Core
○ Pagination
○ Security|identity
○ Audit trail
● Focus on Developer eXperience
○ Opinionated standards based on community proposals
○ CRUD generation
○ Binary packaging
○ Environment management
○ Docker
● Reuse frontend generation
○ Angular|React|Vue.js

46. Thank you
@kbeaugrand
@authfix
@LGouellec
@GaultierLarge
@FlorianGourdeau

47. Take
Away

48. Q&A