How I’ve met .NET Core and a little story about my drama with the framework. This talk will reveal some of my projects and experience with .NET Core and what we can learn from them. We will take a look of some interesting features from .NET Core 3.0 and in the end why I love this framework and the way Microsoft is going.

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Vladimir Georgiev
Software Development Lead @ Concep
vladimirgeorgiev.com
My Story & Features
from
.NET Core 3.0

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Благодарим за подкрепата!
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Plugin architecture with Asp.Net Core
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Web App
eCommerce
Adapter
Abstract App
Plugin App 1

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Web App
eCommerce
Adapter
Abstract App
Plugin App 2
Plugin App 1
Plugin App 4
Plugin App 3Assembly AppDomain
Caching
PluginManager
TypeFinder

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What I learn?
Rewriting is not always fun
Rewriting takes time
Don’t rewrite if you aren’t into the code
Don’t rewrite apps without business value

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SSO with IdentityServer & Asp.Net Core
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Deployment
App
Customer
App
Customer
App
Customer
App
Customer
App
Web API
External Systems
vladimirgeorgiev.com
Basic Auth Basic Auth
Basic Auth

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Auth Server
Deployment
App
Customer
App
Customer
App
Customer
App
Customer
App
Web API
External Systems
vladimirgeorgiev.com

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What I have learned?
Understand business
Be patient
But I want new technologies…
Business will ask for it

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ASP.NET Core 3.0 Features

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Applications now have executables by default

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Framework Dependent Self-Contained

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dotnet build now copies dependencies

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Json.NET

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Json.NET

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Fast in-box JSON Reader
Utf8JsonReader

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Utf8JsonReader
DEMO

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Assembly Metadata Reading
MetadataLoadContext in .NET Core 3.0
Same as ReflectionOnlyLoad from .NET Framework
Reading assembly metadata without affecting the caller’s application domain
Available in System.Reflection.MetadataLoadContext
Loaded into the reflection-only context

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Assembly Metadata Reading
var paths = new string[] { @"C:myappapp.dll" };
var resolver = new PathAssemblyResolver(paths);
using (var lc = new MetadataLoadContext(resolver))
{
Assembly a = lc.LoadFromAssemblyName("app");
Type myInterface = a.GetType("App.IReconnectApplication");
foreach (Type t in a.GetTypes())
{
if (t.IsClass && myInterface.IsAssignableFrom(t))
Console.WriteLine($"Class {t.FullName}");
}
}

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Assembly Metadata Reading
var paths = new string[] { @"C:myappapp.dll" };
var resolver = new PathAssemblyResolver(paths);
using (var lc = new MetadataLoadContext(resolver))
{
Assembly a = lc.LoadFromAssemblyName("app");
Type myInterface = a.GetType("App.IReconnectApplication");
foreach (Type t in a.GetTypes())
{
if (t.IsClass && myInterface.IsAssignableFrom(t))
Console.WriteLine($"Class {t.FullName}");
}
}

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Assembly Metadata Reading
var paths = new string[] { @"C:myappapp.dll" };
var resolver = new PathAssemblyResolver(paths);
using (var lc = new MetadataLoadContext(resolver))
{
Assembly a = lc.LoadFromAssemblyName("app");
Type myInterface = a.GetType("App.IReconnectApplication");
foreach (Type t in a.GetTypes())
{
if (t.IsClass && myInterface.IsAssignableFrom(t))
Console.WriteLine($"Class {t.FullName}");
}
}

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Assembly Metadata Reading
var paths = new string[] { @"C:myappapp.dll" };
var resolver = new PathAssemblyResolver(paths);
using (var lc = new MetadataLoadContext(resolver))
{
Assembly a = lc.LoadFromAssemblyName("app");
Type myInterface = a.GetType("App.IReconnectApplication");
foreach (Type t in a.GetTypes())
{
if (t.IsClass && myInterface.IsAssignableFrom(t))
Console.WriteLine($"Class {t.FullName}");
}
}

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Assembly Metadata Reading
var paths = new string[] { @"C:myappapp.dll" };
var resolver = new PathAssemblyResolver(paths);
using (var lc = new MetadataLoadContext(resolver))
{
Assembly a = lc.LoadFromAssemblyName("app");
Type myInterface = a.GetType("App.IReconnectApplication");
foreach (Type t in a.GetTypes())
{
if (t.IsClass && myInterface.IsAssignableFrom(t))
Console.WriteLine($"Class {t.FullName}");
}
}

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Tiered Compilation – How JIT works?
App Start JIT
App Start JIT
Fast Application Loading
Low application performance
Slow application loading
High application performance

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Tiered Compilation – How Tiered uses JIT?
App Start JIT JIT
Fast application loading
High application performance

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Tiered Compilation
Add MSBuild property to the default property group in project file:
Add in configProperties to the runtimeconfig.json:
<TieredCompilation>true</TieredCompilation>
"System.Runtime.TieredCompilation": true

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More and more…
Cryptography
AES-GCM
AES-CCM
Import/Export of asymmetric public and private keys from standard formats
No more need of X.509 certificate
IoT
Serial Port APIs support on Linux
GPIO, PWM, SPI and I2C APIs
TLS 1.3 and OpenSSL 1.1.1 on Linux
And many more…

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The Future of .NET Core
High performance
High quality
High developer productivity
Multi-platform support
Multi-language support
Easy deployment
Minimize chance of errors

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Vladimir Georgiev
vladimirgeorgiev.com
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