Tamir Dresher - Demystifying the Core of .NET Core

Tamir Dresher
@tamir_dresher
Demystifying the Core of .NET Core
1

@tamir_dresher
.NET Core
Finally
2

3
• Software architect, consultant and instructor
• Software Engineering Lecturer @ Ruppin Academic Center
• Author of Rx.NET in Action (Manning)
@tamir_dresher
http://www.TamirDresher.com.
About Me
3

@tamir_dresher
Agenda
• What is .NET Core
• .NET Core application Core components
• .NET Core Deployment Models
• Sharing code with .NET Standard
4

@tamir_dresher
What’s .NET Core
• A new implementation of .NET – modular, performant, seperated
• Cross Platform and Cross Devices
• Allows side-by-side execution
• Pay-for-play model – only “pay” for the part of CoreFx you use
• Open source:
• Github.com/dotnet
• https://github.com/dotnet/corefx
• https://github.com/dotnet/core

@tamir_dresher
Full .NET dev process - build
7
using System;
namespace testproj
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
}
.method private hidebysig static
void Main (
string[] args
) cil managed
{
// Method begins at RVA 0x2050
// Code size 13 (0xd)
.maxstack 8
.entrypoint
IL_0000: nop
IL_0001: ldstr "Hello World!"
IL_0006: call void [System.Console]System.Console::WriteLine(string)
IL_000b: nop
IL_000c: ret
} // end of method Program::Main
csc
mscorlib.dll
reference
[app].dll/*.exe*.cs

@tamir_dresher
Full .NET dev process - execution
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void Main (
string[] args
) cil managed
{
.maxstack 8
.entrypoint
IL_0000: nop
IL_000b: nop
IL_000c: ret
mscorlib.dll
load
[app].dll/*.exe
JIT
Loader
(Fusion)
GC
1. MSCorEE.dll
2. C:Windows
Microsoft.NET
Framework64
[version]
clr.dll
Load and run
CLR
...

@tamir_dresher
.NET Core
• .NET Core runtime – contains the CoreCLR. exist for each supported platform
• Location: C:Program FilesdotnetsharedMicrosoft.NETCore.App
• .NET Core SDK – tooling, templates, packages cache + the runtime
• Location: C:Program Filesdotnetsdk
• .NET Core CLI - command-line (CLI) tools, used for building .NET Core apps and
libraries
• https://www.microsoft.com/net/download/all
9

@tamir_dresher
Full .NET dev process - build
10
using System;
namespace testproj
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
}
void Main (
string[] args
) cil managed
{
.maxstack 8
.entrypoint
IL_0000: nop
IL_000b: nop
IL_000c: ret
dotnet build
Microsoft.NETCore.App
reference
[app].dll*.cs
[app].runtimeconfig.json [app].runtimeconfig.dev.json
[app].deps.json

@tamir_dresher
Full .NET dev process - execution
11
void Main (
string[] args
) cil managed
{
.maxstack 8
.entrypoint
IL_0000: nop
IL_000b: nop
IL_000c: ret
CoreFX
load
app.dll
JIT
Loader
(Fusion)
GC
dotnet-core
Runtime
Load and run
CoreCLR
...
> dotnet app.dll
[app].runtimeconfig.json [app].runtimeconfig.dev.json
[app].deps.json
configuration
reads

Demo
Creating a .NET Core console app and running in windows and linux
12

@tamir_dresher
.NET Core Build Artifacts
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Dependencies Manifest
Runtime configuration
Optional configuration

@tamir_dresher
Changing runtime configuration
• In Full .NET Some configuration were only possible in app/machine.config (e.g.
changing the gc)
• app/machine.config is gone, user *.runtimeconfig.json instead
• Full list of configuration properties for CoreCLR
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp2.1</TargetFramework>
<ServerGarbageCollection>true</ServerGarbageCollection>
</PropertyGroup>
</Project>
{
"runtimeOptions": {
...
},
"configProperties": {
"System.GC.Server": true
}
}
}
[project].csproj [project].runtimeconfig.json

@tamir_dresher
Controlling the runtime version
• The global.json file allows selection of the .NET Core tools version being used
through the sdk property.
• .NET Core CLI tools look for this file in the current working directory, or one of
its parent directories.
15
…
--- Resolving dotnet from working dir
Probing path [c:tempnewprojbinDebugnetcoreapp2.1global.json] for global.json
Probing path [c:tempnewprojbinDebugglobal.json] for global.json
Probing path [c:tempnewprojbinglobal.json] for global.json
Probing path [c:tempnewprojglobal.json] for global.json
Probing path [c:tempglobal.json] for global.json
Probing path [c:global.json] for global.json
Terminating global.json search at [c:]
…
> SET COREHOST_TRACE=1
> dotnet app.dll
{
"sdk": { "version": "1.0.0-preview2-003121" }
}

@tamir_dresher
Types of .NET Core applications deployments
• Requires .NET Core Runtime on the target system.
• Portable between installations of .NET Core.
• Executed by running the dotnet utility.
For example, dotnet app.dll
16
Framework
Dependent
Deployment
(FDD)
Self
Contained
Deployment
(SCD)
• .NET Core libraries and Runtime, are included with the
application
• Isolated from other .NET Core applications.
• Include A renamed version of the platform-specific .NET
Core host (such as app.exe on Windows) which then runs
the actual app.dll

@tamir_dresher
Self Contained Deployment (SCD)
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1. Add the Runtime Identifiers (RID) to the csproj
• https://docs.microsoft.com/en-us/dotnet/core/rid-catalog#windows-rids
2. Publish the project to the target platform
<PropertyGroup>
<RuntimeIdentifiers>win10-x64;osx.10.11-x64</RuntimeIdentifiers>
</PropertyGroup>
> dotnet publish -c Release -r win10-x64
> dotnet publish -c Release -r osx.10.11-x64

@tamir_dresher
Self Contained Deployment (SCD)
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1. Add the Runtime Identifiers (RID) to the csproj
• https://docs.microsoft.com/en-us/dotnet/core/rid-catalog#windows-rids
2. Publish the project to the target platform
<PropertyGroup>
<RuntimeIdentifiers>win10-x64;osx.10.11-x64</RuntimeIdentifiers>
</PropertyGroup>
> dotnet publish -c Release -r win10-x64
> dotnet publish -c Release -r osx.10.11-x64

Demo
Self-contained deployment
19

Creating reusable
libraries with .NET
Standard
20

@tamir_dresher
The problem
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.NET Framework .NET Core Xamarin(Mono)
WinForms
WPF
ASP.NET
UWP
Console
ASP.NET
Core
iOS
OS X
Android
Framework Class
Library (FCL) CoreFX Mono Class Library
MyLib.dll
?

@tamir_dresher
Possible Solution – portable Class Library (PCL)
22
.NET 4.5
Silverlight
5
Windows
8
Profile47

@tamir_dresher
Possible Solution – portable Class Library (PCL)
23
.NET 4.5
Silverlight
5
Windows
8
Profile47

@tamir_dresher
A better solution - .NET Standard
.NET Framework .NET Core Xamarin(Mono)
WinForms
WPF
ASP.NET
UWP
Console
ASP.NET
Core
UWP
Console
ASP.NET
Core
Framework Class
Library (FCL) CoreFX Mono Class Library.NET Standard

@tamir_dresher
A better solution - .NET Standard
• A Spec (Standard) supported by all .NET implementations (Currently 2.0)
• .NET Standard is a set of APIs that all .NET platforms have to implement. This
unifies the .NET platforms and prevents future fragmentation.
• https://github.com/dotnet/standard
2.0
1.6
1.3
1.0

@tamir_dresher
How a .NET Standard works?
28

@tamir_dresher
.NET Standard Shim and Stubs – build time
30

@tamir_dresher
31

@tamir_dresher 32
%USERPROFILE%.nugetpackagesnetstandard.library2.0.1buildnetstandard2.0ref

@tamir_dresher
.NET Standard Shim and Stubs – runtime
33

@tamir_dresher
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[install dir]dotnetsharedMicrosoft.NETCore.App2.1.0-preview1-26216-03

@tamir_dresher
35
[install dir]dotnetsharedMicrosoft.NETCore.App2.1.0-preview1-26216-03

@tamir_dresher
Summary
• What is .NET Core – cross platform .NET
• .NET Core application Core components
• SDK, Runtime
• Artifacts - *.runtimeconfig.{dev}.json, *. deps.json
• .NET Core Deployment Models – FDD, SCD
• Sharing code with .NET Standard
• PCL vs .NET Standard
• NETStandard.Library, netstandard.dll shim and stubs
36

Thank You
38
@tamir_dresher
http://www.TamirDresher.com.

@tamir_dresher
The Runtime Package Store
• A local repository of pre-downloaded nuged packages
• The new GAC
• dotnet
store
x64
netcoreapp2.0
microsoft.applicationinsights
microsoft.aspnetcore
...
x86
netcoreapp2.0
microsoft.applicationinsights
microsoft.aspnetcore
...
40

@tamir_dresher
41
<Project Sdk="Microsoft.NET.Sdk">
<ItemGroup>
<PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
<PackageReference Include="Moq" Version="4.7.63" />
</ItemGroup>
</Project>
dotnet store
--manifest packages.csproj
--runtime win 10-x64
--framework netcoreapp 2.0
--framework-version 2.0.0
<StoreArtifacts>
<Package Id="Newtonsoft.Json" Version="10.0.3" />
<Package Id="Castle.Core" Version="4.1.0" />
<Package Id="Moq" Version="4.7.63" />
</StoreArtifacts>

@tamir_dresher
• You can configure your project to use a Runtime Package Restore
• dotnet publish --manifest <PATH_TO_MANIFEST_FILE>
42

Tamir Dresher - Demystifying the Core of .NET Core

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