Finished Defining an Event & Subscribing to an Event

.devcontainer/Dockerfile

@@ -0,0 +1,23 @@
+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.158.0/containers/dotnet/.devcontainer/base.Dockerfile
+
+# [Choice] .NET version: 5.0, 3.1, 2.1
+ARG VARIANT="5.0"
+FROM mcr.microsoft.com/vscode/devcontainers/dotnetcore:0-${VARIANT}
+
+# [Option] Install Node.js
+ARG INSTALL_NODE="true"
+ARG NODE_VERSION="lts/*"
+RUN if [ "${INSTALL_NODE}" = "true" ]; then su vscode -c "umask 0002 && . /usr/local/share/nvm/nvm.sh && nvm install ${NODE_VERSION} 2>&1"; fi
+
+# [Option] Install Azure CLI
+ARG INSTALL_AZURE_CLI="false"
+COPY library-scripts/azcli-debian.sh /tmp/library-scripts/
+RUN if [ "$INSTALL_AZURE_CLI" = "true" ]; then bash /tmp/library-scripts/azcli-debian.sh; fi \
+    && apt-get clean -y && rm -rf /var/lib/apt/lists/* /tmp/library-scripts
+
+# [Optional] Uncomment this section to install additional OS packages.
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends tree
+
+# [Optional] Uncomment this line to install global node packages.
+# RUN su vscode -c "source /usr/local/share/nvm/nvm.sh && npm install -g <your-package-here>" 2>&1

.devcontainer/devcontainer.json

@@ -0,0 +1,58 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.158.0/containers/dotnet
+{
+	"name": "C# (.NET)",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": { 
+			// Update 'VARIANT' to pick a .NET Core version: 2.1, 3.1, 5.0
+			"VARIANT": "5.0",
+			// Options
+			"INSTALL_NODE": "true",
+			"NODE_VERSION": "lts/*",
+			"INSTALL_AZURE_CLI": "false"
+		}
+	},
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {
+		"terminal.integrated.shell.linux": "/bin/bash"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"ms-dotnettools.csharp"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [5000, 5001],
+
+	// [Optional] To reuse of your local HTTPS dev cert:
+	//
+	// 1. Export it locally using this command:
+	//    * Windows PowerShell:
+	//        dotnet dev-certs https --trust; dotnet dev-certs https -ep "$env:USERPROFILE/.aspnet/https/aspnetapp.pfx" -p "SecurePwdGoesHere"
+	//    * macOS/Linux terminal:
+	//        dotnet dev-certs https --trust; dotnet dev-certs https -ep "${HOME}/.aspnet/https/aspnetapp.pfx" -p "SecurePwdGoesHere"
+	// 
+	// 2. Uncomment these 'remoteEnv' lines:
+	//    "remoteEnv": {
+	// 	      "ASPNETCORE_Kestrel__Certificates__Default__Password": "SecurePwdGoesHere",
+	//        "ASPNETCORE_Kestrel__Certificates__Default__Path": "/home/vscode/.aspnet/https/aspnetapp.pfx",
+	//    },
+	//
+	// 3. Do one of the following depending on your scenario:
+	//    * When using GitHub Codespaces and/or Remote - Containers:
+	//      1. Start the container
+	//      2. Drag ~/.aspnet/https/aspnetapp.pfx into the root of the file explorer
+	//      3. Open a terminal in VS Code and run "mkdir -p /home/vscode/.aspnet/https && mv aspnetapp.pfx /home/vscode/.aspnet/https"
+	//
+	//    * If only using Remote - Containers with a local container, uncomment this line instead:
+	//      "mounts": [ "source=${env:HOME}${env:USERPROFILE}/.aspnet/https,target=/home/vscode/.aspnet/https,type=bind" ],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "dotnet restore",
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}

.devcontainer/library-scripts/azcli-debian.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+#-------------------------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
+#-------------------------------------------------------------------------------------------------------------
+#
+# Docs: https://github.com/microsoft/vscode-dev-containers/blob/master/script-library/docs/azcli.md
+#
+# Syntax: ./azcli-debian.sh
+
+set -e
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
+    exit 1
+fi
+
+export DEBIAN_FRONTEND=noninteractive
+
+# Install curl, apt-transport-https, lsb-release, or gpg if missing
+if ! dpkg -s apt-transport-https curl ca-certificates lsb-release > /dev/null 2>&1 || ! type gpg > /dev/null 2>&1; then
+    if [ ! -d "/var/lib/apt/lists" ] || [ "$(ls /var/lib/apt/lists/ | wc -l)" = "0" ]; then
+        apt-get update
+    fi
+    apt-get -y install --no-install-recommends apt-transport-https curl ca-certificates lsb-release gnupg2 
+fi
+
+# Install the Azure CLI
+echo "deb [arch=amd64] https://packages.microsoft.com/repos/azure-cli/ $(lsb_release -cs) main" > /etc/apt/sources.list.d/azure-cli.list
+curl -sL https://packages.microsoft.com/keys/microsoft.asc | (OUT=$(apt-key add - 2>&1) || echo $OUT)
+apt-get update
+apt-get install -y azure-cli
+echo "Done!"

.gitignore

@@ -0,0 +1,738 @@
+# File created using '.gitignore Generator' for Visual Studio Code: https://bit.ly/vscode-gig
+
+# Created by https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,macos,linux,executable,csharp,aspnetcore,visualstudio
+# Edit at https://www.toptal.com/developers/gitignore?templates=windows,visualstudiocode,macos,linux,executable,csharp,aspnetcore,visualstudio
+
+### ASPNETCore ###
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+node_modules/
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+# tools/
+
+### Csharp ###
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.rsuser
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+
+# Mono auto generated files
+mono_crash.*
+
+# Build results
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+[Ll]ogs/
+
+# Visual Studio 2015/2017 cache/options directory
+# Uncomment if you have tasks that create the project's static files in wwwroot
+
+# Visual Studio 2017 auto generated files
+Generated\ Files/
+
+# MSTest test Results
+
+# NUnit
+nunit-*.xml
+
+# Build Results of an ATL Project
+
+# Benchmark Results
+BenchmarkDotNet.Artifacts/
+
+# .NET Core
+
+# StyleCop
+StyleCopReport.xml
+
+# Files built by Visual Studio
+*_h.h
+*.iobj
+*.ipdb
+*_wpftmp.csproj
+
+# Chutzpah Test files
+
+# Visual C++ cache files
+
+# Visual Studio profiler
+
+# Visual Studio Trace Files
+*.e2e
+
+# TFS 2012 Local Workspace
+
+# Guidance Automation Toolkit
+
+# ReSharper is a .NET coding add-in
+
+# TeamCity is a build add-in
+
+# DotCover is a Code Coverage Tool
+
+# AxoCover is a Code Coverage Tool
+.axoCover/*
+!.axoCover/settings.json
+
+# Coverlet is a free, cross platform Code Coverage Tool
+coverage*[.json, .xml, .info]
+
+# Visual Studio code coverage results
+
+# NCrunch
+
+# MightyMoose
+
+# Web workbench (sass)
+
+# Installshield output folder
+
+# DocProject is a documentation generator add-in
+
+# Click-Once directory
+
+# Publish Web Output
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+
+# NuGet Packages
+# NuGet Symbol Packages
+*.snupkg
+# The packages folder can be ignored because of Package Restore
+**/[Pp]ackages/*
+# except build/, which is used as an MSBuild target.
+!**/[Pp]ackages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/[Pp]ackages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+
+# Microsoft Azure Build Output
+
+# Microsoft Azure Emulator
+
+# Windows Store app package directories and files
+*.appx
+*.appxbundle
+*.appxupload
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+# but keep track of directories ending in .cache
+!?*.[Cc]ache/
+
+# Others
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+#*.snk
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+
+# RIA/Silverlight projects
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+ServiceFabricBackup/
+*.rptproj.bak
+
+# SQL Server files
+*.ndf
+
+# Business Intelligence projects
+*.rptproj.rsuser
+*- [Bb]ackup.rdl
+*- [Bb]ackup ([0-9]).rdl
+*- [Bb]ackup ([0-9][0-9]).rdl
+
+# Microsoft Fakes
+
+# GhostDoc plugin setting file
+
+# Node.js Tools for Visual Studio
+
+# Visual Studio 6 build log
+
+# Visual Studio 6 workspace options file
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio LightSwitch build output
+
+# Paket dependency manager
+
+# FAKE - F# Make
+
+# CodeRush personal settings
+.cr/personal
+
+# Python Tools for Visual Studio (PTVS)
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+*.tss
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs
+
+# OpenCover UI analysis results
+OpenCover/
+
+# Azure Stream Analytics local run output
+ASALocalRun/
+
+# MSBuild Binary and Structured Log
+*.binlog
+
+# NVidia Nsight GPU debugger configuration file
+*.nvuser
+
+# MFractors (Xamarin productivity tool) working folder
+.mfractor/
+
+# Local History for Visual Studio
+.localhistory/
+
+# BeatPulse healthcheck temp database
+healthchecksdb
+
+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+MigrationBackup/
+
+# Ionide (cross platform F# VS Code tools) working folder
+.ionide/
+
+### Executable ###
+*.app
+*.bat
+*.cgi
+*.com
+*.exe
+*.gadget
+*.jar
+*.pif
+*.vb
+*.wsf
+
+### Linux ###
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/tasks.json
+!.vscode/launch.json
+*.code-workspace
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+### VisualStudio ###
+
+# User-specific files
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+
+# Mono auto generated files
+
+# Build results
+
+# Visual Studio 2015/2017 cache/options directory
+# Uncomment if you have tasks that create the project's static files in wwwroot
+
+# Visual Studio 2017 auto generated files
+
+# MSTest test Results
+
+# NUnit
+
+# Build Results of an ATL Project
+
+# Benchmark Results
+
+# .NET Core
+
+# StyleCop
+
+# Files built by Visual Studio
+
+# Chutzpah Test files
+
+# Visual C++ cache files
+
+# Visual Studio profiler
+
+# Visual Studio Trace Files
+
+# TFS 2012 Local Workspace
+
+# Guidance Automation Toolkit
+
+# ReSharper is a .NET coding add-in
+
+# TeamCity is a build add-in
+
+# DotCover is a Code Coverage Tool
+
+# AxoCover is a Code Coverage Tool
+
+# Coverlet is a free, cross platform Code Coverage Tool
+
+# Visual Studio code coverage results
+
+# NCrunch
+
+# MightyMoose
+
+# Web workbench (sass)
+
+# Installshield output folder
+
+# DocProject is a documentation generator add-in
+
+# Click-Once directory
+
+# Publish Web Output
+# Note: Comment the next line if you want to checkin your web deploy settings,
+# but database connection strings (with potential passwords) will be unencrypted
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+
+# NuGet Packages
+# NuGet Symbol Packages
+# The packages folder can be ignored because of Package Restore
+# except build/, which is used as an MSBuild target.
+# Uncomment if necessary however generally it will be regenerated when needed
+# NuGet v3's project.json files produces more ignorable files
+
+# Microsoft Azure Build Output
+
+# Microsoft Azure Emulator
+
+# Windows Store app package directories and files
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+# but keep track of directories ending in .cache
+
+# Others
+
+# Including strong name files can present a security risk
+# (https://github.com/github/gitignore/pull/2483#issue-259490424)
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+
+# RIA/Silverlight projects
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+
+# SQL Server files
+
+# Business Intelligence projects
+
+# Microsoft Fakes
+
+# GhostDoc plugin setting file
+
+# Node.js Tools for Visual Studio
+
+# Visual Studio 6 build log
+
+# Visual Studio 6 workspace options file
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+
+# Visual Studio LightSwitch build output
+
+# Paket dependency manager
+
+# FAKE - F# Make
+
+# CodeRush personal settings
+
+# Python Tools for Visual Studio (PTVS)
+
+# Cake - Uncomment if you are using it
+# tools/**
+# !tools/packages.config
+
+# Tabs Studio
+
+# Telerik's JustMock configuration file
+
+# BizTalk build output
+
+# OpenCover UI analysis results
+
+# Azure Stream Analytics local run output
+
+# MSBuild Binary and Structured Log
+
+# NVidia Nsight GPU debugger configuration file
+
+# MFractors (Xamarin productivity tool) working folder
+
+# Local History for Visual Studio
+
+# BeatPulse healthcheck temp database
+
+# Backup folder for Package Reference Convert tool in Visual Studio 2017
+
+# Ionide (cross platform F# VS Code tools) working folder
+
+# End of https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,macos,linux,executable,csharp,aspnetcore,visualstudio
+
+# Custom rules (everything added below won't be overriden by 'Generate .gitignore File' if you use 'Update' option)
+

.vscode/launch.json

@@ -0,0 +1,30 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "OS-COMMENT1": "Use IntelliSense to find out which attributes exist for C# debugging",
+            "OS-COMMENT2": "Use hover for the description of the existing attributes",
+            "OS-COMMENT3": "For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md",
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "OS-COMMENT4": "If you have changed target frameworks, make sure to update the program path.",
+            "program": "${workspaceFolder}/gradebook/src/GradeBook/bin/Debug/net5.0/GradeBook.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}/gradebook/src/GradeBook",
+            "OS-COMMENT5": "For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console",
+            "console": "internalConsole",
+            "stopAtEntry": false
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command:pickProcess}"
+        }
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,42 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "build",
+                "${workspaceFolder}/gradebook/src/GradeBook/GradeBook.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "publish",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "publish",
+                "${workspaceFolder}/gradebook/src/GradeBook/GradeBook.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "watch",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "watch",
+                "run",
+                "${workspaceFolder}/gradebook/src/GradeBook/GradeBook.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

gradebook/README.md

@@ -0,0 +1,7 @@
+# GradeBook
+
+Requirement from PM:
+
+> We need an electronic grade book to read the scores of an individual student and then compute some simple statistics from the scores.
+> The grades are entered as floating point numbers from 0 to 100, and the statistics show us the highest grade, the lowest grade, and the average grade.
+

gradebook/gradebook.sln

@@ -0,0 +1,56 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26124.0
+MinimumVisualStudioVersion = 15.0.26124.0
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{41D689B9-3B52-432B-97EF-63FB665C1AA7}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GradeBook", "src\GradeBook\GradeBook.csproj", "{B67A3D2F-4755-46E6-960C-8746BADB002C}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "test", "test", "{C32AB033-6E6D-4451-9194-0F6933BC383D}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GradeBook.Tests", "test\GradeBook.Tests\GradeBook.Tests.csproj", "{203083CF-9050-48AC-87CC-53AF6F8F79BE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Debug|x64.Build.0 = Debug|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Debug|x86.Build.0 = Debug|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Release|x64.ActiveCfg = Release|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Release|x64.Build.0 = Release|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Release|x86.ActiveCfg = Release|Any CPU
+		{B67A3D2F-4755-46E6-960C-8746BADB002C}.Release|x86.Build.0 = Release|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Debug|x64.Build.0 = Debug|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Debug|x86.Build.0 = Debug|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Release|Any CPU.Build.0 = Release|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Release|x64.ActiveCfg = Release|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Release|x64.Build.0 = Release|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Release|x86.ActiveCfg = Release|Any CPU
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE}.Release|x86.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{B67A3D2F-4755-46E6-960C-8746BADB002C} = {41D689B9-3B52-432B-97EF-63FB665C1AA7}
+		{203083CF-9050-48AC-87CC-53AF6F8F79BE} = {C32AB033-6E6D-4451-9194-0F6933BC383D}
+	EndGlobalSection
+EndGlobal

gradebook/src/GradeBook/Book.cs

@@ -0,0 +1,104 @@
+using System;
+using System.Collections.Generic;
+
+namespace GradeBook
+{
+    public delegate void GradeAddedDelegate(object sender, EventArgs args);
+
+    public class Book
+    {
+        private List<double> grades;
+
+        readonly string category;
+
+        private string name;
+        public string Name
+        {
+            get;
+            set;
+        }
+
+        public Book(string name)
+        {
+            Name = name;
+            grades = new List<double>();
+        }
+
+        public void AddGrade(double grade)
+        {
+            if (grade <= 100 && grade >= 0)
+            {
+                this.grades.Add(grade);
+
+                if (GradeAdded != null)
+                {
+                    // Somebody is listening/subscribing
+                    GradeAdded(this, new EventArgs()); // sender = this, pass; Raising event
+                }
+            } else
+            {
+                throw new ArgumentException($"Invalid {nameof(grade)}");
+            }
+        }
+
+        public void AddGrade(char letter)
+        {
+            switch (letter)
+            {
+                case 'A':
+                    AddGrade(90);
+                    break;
+                case 'B':
+                    AddGrade(80);
+                    break;
+                case 'C':
+                    AddGrade(70);
+                    break;
+                default:
+                    AddGrade(0);
+                    break;
+            }
+        }
+
+        public event GradeAddedDelegate GradeAdded;
+
+        public Statistics GetStatistics()
+        {
+            var result = new Statistics();
+            result.Average = 0.0;
+            result.highGrade = double.MinValue;
+            result.lowGrade = double.MaxValue;
+
+            foreach (var grade in this.grades)
+            {
+                result.lowGrade = Math.Min(grade, result.lowGrade);
+                result.highGrade = Math.Max(grade, result.highGrade);
+                result.Average += grade;
+            }
+
+            result.Average /= grades.Count;
+
+            switch (result.Average)
+            {
+                case var d when d >= 90.0:
+                    result.Letter = 'A';
+                    break;
+                case var d when d >= 80.0:
+                    result.Letter = 'B';
+                    break;
+                case var d when d >= 70.0:
+                    result.Letter = 'C';
+                    break;
+                case var d when d >= 60.0:
+                    result.Letter = 'D';
+                    break;
+                default:
+                    result.Letter = 'F';
+                    break;
+            }
+
+            return result;
+        }
+    }
+    
+}

gradebook/src/GradeBook/GradeBook.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

gradebook/src/GradeBook/Program.cs

@@ -0,0 +1,69 @@
+using System;
+using System.Collections.Generic;
+
+namespace GradeBook
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+
+            // var book = new Book("Scott's Grade Book");
+            // book.AddGrade(89.1);
+            // book.AddGrade(90.5);
+            // book.AddGrade(87.2);
+
+            var book = new Book("Jason's Grade Book");
+            book.GradeAdded += OnGradeAdded;
+            book.GradeAdded += OnGradeAdded;
+            book.GradeAdded -= OnGradeAdded;
+            book.GradeAdded -= OnGradeAdded;
+
+            string input;
+
+            while (true)
+            {
+                Console.WriteLine("Give input: ");
+                input = Console.ReadLine();
+                if (input == "Q" || input == "q")
+                {
+                    Console.WriteLine("Receiving termination signal; Termiate program");
+                    break;
+                } else
+                {
+                    try
+                    {
+                        Console.WriteLine($"Received: {input}");
+                        book.AddGrade(Convert.ToDouble(input));   
+                        // book.AddGrade('A');
+                    }
+                    catch (ArgumentException ex)
+                    {
+                        Console.WriteLine(ex.Message);
+                    }
+                    catch (FormatException ex)
+                    {
+                        Console.WriteLine(ex.Message);
+                    }
+                    finally
+                    {
+                        // Will always run for all catch scenario
+                        Console.WriteLine("Always Done");
+                    }
+                }
+            }
+
+            var stats = book.GetStatistics();
+
+            Console.WriteLine($"The lowest grade is {stats.lowGrade}");
+            Console.WriteLine($"The highesst grade is {stats.highGrade}");
+            Console.WriteLine($"The average grade is {stats.Average:N1}");
+        }
+
+        static void OnGradeAdded(object sender, EventArgs e)
+        {
+            // Main is static, so it can only call static methods, hence return type is static
+            Console.WriteLine("A line has added");
+        }
+    }
+}

gradebook/src/GradeBook/Statistics.cs

@@ -0,0 +1,10 @@
+namespace GradeBook
+{
+    public class Statistics
+    {
+        public double Average;
+        public double highGrade;
+        public double lowGrade;
+        public char Letter;
+    }
+}

gradebook/test/GradeBook.Tests/BookTests.cs

@@ -0,0 +1,27 @@
+using System;
+using Xunit;
+
+namespace GradeBook.Tests
+{
+    public class BookTests
+    {
+        [Fact]
+        public void BookCalculateAnAverageGrade()
+        {
+            // arrange
+            var book = new Book("");
+            book.AddGrade(89.1);
+            book.AddGrade(90.5);
+            book.AddGrade(77.3);
+            
+            // act
+            var result = book.GetStatistics();
+
+            // assert
+            Assert.Equal(85.6, result.Average, 1);
+            Assert.Equal(90.5, result.highGrade);
+            Assert.Equal(77.3, result.lowGrade);
+            Assert.Equal('B', result.Letter);
+        }
+    }
+}

gradebook/test/GradeBook.Tests/GradeBook.Tests.csproj

@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="1.3.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\GradeBook\GradeBook.csproj" />
+  </ItemGroup>
+
+</Project>

gradebook/test/GradeBook.Tests/TypeTests.cs

@@ -0,0 +1,141 @@
+using System;
+using Xunit;
+
+namespace GradeBook.Tests
+{
+    using GradeBook;
+ 
+    public delegate string WriteLogDelegate(string logMessage);
+
+    public class TypeTests
+    {
+        int count = 0;
+
+        [Fact]
+        public void WriteLogDelegateCanPointToMethod()
+        {
+            string msg = "test";
+
+            WriteLogDelegate log = new WriteLogDelegate(ReturnMessage); // Instantiate a delegate
+            log += ReturnMessage2; // Multi-cast delegate
+            var result = log(msg); // Invoking a delegate
+            Assert.Equal(result, msg);
+            Assert.Equal(count, 2);
+        }
+
+        string ReturnMessage(string message)
+        {
+            count += 1;
+            return message;
+        }
+        string ReturnMessage2(string message)
+        {
+            count += 1;
+            return message;
+        }
+
+        [Fact]
+        public void ValueTypesAlsoPassByValue()
+        {
+            var x = GetInt();
+            Assert.Equal(3,x);
+
+            SetInt(ref x);
+            Assert.Equal(42, x);
+        }
+
+        private void SetInt(ref int x)
+        {
+            x = 42;
+        }
+
+        private int GetInt()
+        {
+            return 3;
+        }
+
+        [Fact]
+        public void StringsBehaveLikeValueTypes()
+        {
+            string name = "Jason";
+            MakeUppserCase(name); // try to change String like a reference
+
+            Assert.Equal("Jason", name); // ToUpper does not work on String, although it's reference. It's copied as value
+        }
+
+        private void MakeUppserCase(string arg)
+        {
+            arg.ToUpper();
+        }
+
+        [Fact]
+        public void CSharpCanPassByReference()
+        {
+            var book1 = GetBook("Book1");
+            GetBookSetName(ref book1, "New Name");
+
+            Assert.Equal(book1.Name, "New Name");
+        }
+
+        private void GetBookSetName(ref Book book, string name)
+        {
+            book = new Book(name);
+            book.Name = name;
+        }
+
+        [Fact]
+        public void CSharpIsPassByValue()
+        {
+            var book1 = GetBook("Book1");
+            GetBookSetName(book1, "New Name");
+
+            Assert.Equal(book1.Name, "Book1");
+        }
+
+        private void GetBookSetName(Book book, string name)
+        {
+            book = new Book(name);
+            book.Name = name;
+        }
+
+        [Fact]
+        public void CanSetNameFromReference()
+        {
+            var book1 = GetBook("Book1");
+            SetName(book1, "New Name");
+
+            Assert.Equal(book1.Name, "New Name");
+        }
+
+        private void SetName(Book book, string name)
+        {
+            book.Name = name;
+        }
+
+        [Fact]
+        public void GetBookReturnsDifferentObjects()
+        {
+            var book1 = GetBook("Book1");
+            var book2 = GetBook("Book2");
+
+            Assert.Equal("Book1", book1.Name);
+            Assert.Equal("Book2", book2.Name);
+        }
+
+        [Fact]
+        public void TwoVarsCanReferenceSameObject()
+        {
+            var book1 = GetBook("Book1");
+            var book2 = book1;
+
+            Assert.Equal(book2.Name, book1.Name);
+            Assert.True(Object.ReferenceEquals(book1, book2));
+        }
+
+
+        private Book GetBook(string name)
+        {
+            return new Book(name);
+        }
+    }
+}