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Session11 (#52)
* Demos for session 11
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‎sessions/0111-CSharpNine/0111-CSharpNine.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.26124.0
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MinimumVisualStudioVersion = 15.0.26124.0
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SampleConsole", "SampleConsole\SampleConsole.csproj", "{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Debug|x64 = Debug|x64
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Debug|x86 = Debug|x86
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Release|Any CPU = Release|Any CPU
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Release|x64 = Release|x64
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Debug|x64.ActiveCfg = Debug|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Debug|x64.Build.0 = Debug|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Debug|x86.ActiveCfg = Debug|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Debug|x86.Build.0 = Debug|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Release|Any CPU.Build.0 = Release|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Release|x64.ActiveCfg = Release|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Release|x64.Build.0 = Release|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Release|x86.ActiveCfg = Release|Any CPU
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{DDA80D01-59DC-47F5-9C27-0D93D1DF8AC5}.Release|x86.Build.0 = Release|Any CPU
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EndGlobalSection
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EndGlobal

‎sessions/0111-CSharpNine/README.md

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# Session 11 - New C# v9 Features
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With the new release of .NET 5 in November 2020, a new version of the C# programming language was shipped. Let's take a look at five of the largest updates to the language in this session:
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1. Record data types
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1. Init Only Setters
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1. Top Level Programs
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1. Pattern Matching Enhancements
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1. Target-Typed New Expressions

‎sessions/0111-CSharpNine/SampleConsole/1-Records.cs

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using System;
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using static System.Console;
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namespace SampleConsole
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{
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public class Records
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{
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public static void Demo()
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{
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// Create a record object and inspect its string and equals
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Demo1();
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// Inheritance with records
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// Demo2();
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// Deconstruction and Cloning
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//Demo3();
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}
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#region Demo 1
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public static void Demo1()
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{
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// Create a new record object and inspect its string
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var p = new Person("jeff", "fritz");
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WriteLine(p);
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// Change the record object
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//p.LastName = "smith";
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// second record equals first
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// var s = new Person("jeff", "fritz");
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// WriteLine( p == s);
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}
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public record Person
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{
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public string FirstName { get; }
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public string LastName { get; }
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public Person(string first, string last) =>
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(FirstName, LastName) = (first, last);
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}
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#endregion
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#region Demo 2
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public static void Demo2()
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{
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// Records support inheritance
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var p = new CoolPerson("jeff", "fritz");
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WriteLine(p);
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var r = new Rockstar("Freddie", "Mercury", "Queen");
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WriteLine(r);
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WriteLine(r as CoolPerson);
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}
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public record CoolPerson(string FirstName, string LastName);
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public record Rockstar(string FirstName, string LastName, string BandName) : CoolPerson(FirstName, LastName);
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#endregion
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#region Demo 3
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public static void Demo3() {
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var p = new CoolPerson("jeff", "fritz");
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var (first, last) = p;
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WriteLine($"First: {first} Last: {last}");
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// Clone using the WITH expression
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// var s = p with { FirstName = "scott"};
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// WriteLine(s);
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}
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#endregion
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}
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}

‎sessions/0111-CSharpNine/SampleConsole/2-Init.cs

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using System;
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using static System.Console;
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namespace SampleConsole {
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public class Init {
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public static void Demo() {
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Demo1();
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}
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#region Demo1
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public static void Demo1() {
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/*
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var l = new LogEntry {
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Severity = LogSeverity.Error,
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LogTimestampUtc = DateTime.UtcNow,
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Description = "Bad dates..."
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};
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WriteLine(l);
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*/
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}
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public struct LogEntry {
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public readonly LogSeverity Severity;
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public readonly DateTime LogTimestampUtc;
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public readonly string Description;
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public override string ToString()
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{
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return $"{LogTimestampUtc} - {Severity} - {Description}";
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}
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}
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public enum LogSeverity {
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Error,
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Warning,
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Debug,
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Info
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}
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#endregion
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}
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}

‎sessions/0111-CSharpNine/SampleConsole/4-PatternMatching.cs

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using static System.Console;
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namespace SampleConsole
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{
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public class PatternMatching
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{
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public static void Demo()
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{
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var pm = new PatternMatching();
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//pm.Basics();
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//pm.BasicSwitch();
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//pm.PropertyPattern();
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//pm.RockPaperScissors("rock", "scissors");
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pm.NineSimplePattern();
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pm.NineSimplePattern();
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}
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public void Basics()
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{
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// Match on the SHAPE of an object
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object data = 1;
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if (data is int i) WriteLine($"That was an integer: {i}");
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else if (data is double d) WriteLine("Ooh, a double!");
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else WriteLine("Please give me a number");
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}
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public void BasicSwitch()
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{
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object data = 0;
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switch (data)
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{
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case 0:
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WriteLine("Zero");
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break;
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case double d:
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WriteLine("Double!");
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break;
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case int n when n > 0:
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WriteLine("A positive integer");
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break;
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case null:
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WriteLine("Give me a value!");
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break;
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default:
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WriteLine("You're boring...");
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break;
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}
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}
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public void PropertyPattern()
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{
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// Calculate toll
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Vehicle v = null;
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var toll = v switch
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{
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{ Wheels: 2 } => 0.25,
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{ Wheels: 4 } => 0.50,
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Truck t when t.TotalWeight < 10000 => 1.00,
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_ => 2.00
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};
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}
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public static string RockPaperScissors(string first, string second)
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=> (first, second) switch
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{
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("rock", "paper") => "rock is covered by paper. Paper wins.",
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("rock", "scissors") => "rock breaks scissors. Rock wins.",
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("paper", "rock") => "paper covers rock. Paper wins.",
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("paper", "scissors") => "paper is cut by scissors. Scissors wins.",
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("scissors", "rock") => "scissors is broken by rock. Rock wins.",
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("scissors", "paper") => "scissors cuts paper. Scissors wins.",
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(_, _) => "tie"
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};
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public void NineSimplePattern() {
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// Calculate toll
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Vehicle v = null;
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var toll = v switch
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{
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{ Wheels: 2 } => 0.25,
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{ Wheels: 4 } => 0.50,
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Truck => 1.00,
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_ => 2.00
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};
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}
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public void NineRelationalPatterns() {
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// Calculate toll
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Truck t = new Truck { TotalWeight=9500 };
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var toll = t.TotalWeight switch
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{
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< 5000 => 1.00,
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< 10000 => 2.00,
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> 50000 => 5.00,
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_ => 3.00
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};
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}
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public void NineLogicalPatterns() {
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// Calculate toll
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Truck t = new Truck { TotalWeight=9500 };
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// and or not
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var toll = t.TotalWeight switch
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{
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< 5000 => 1.00,
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< 10000 and >= 5000 => 2.00,
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> 50000 => 5.00,
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_ => 3.00
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};
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}
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#region Objects
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public abstract class Vehicle
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{
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public int Passengers { get; set; }
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public int Wheels { get; set; }
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}
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public class Car : Vehicle
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{
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public Car()
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{
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Wheels = 4;
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}
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}
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public class Truck : Vehicle
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{
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public int TotalWeight { get; set; }
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}
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#endregion
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}
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}

‎sessions/0111-CSharpNine/SampleConsole/5-NewTarget.cs

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using System;
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using System.Drawing;
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using System.Collections.Generic;
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using static System.Console;
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namespace SampleConsole {
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public class NewTarget {
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public static void Demo() {
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var t = new NewTarget();
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t.Demo1();
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}
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public void Demo1() {
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List<int> myList = new();
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// Repeated object initializers
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Point[] numbers = {new (1,1), new(1,2), new(1,3)};
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WriteLine(numbers.Length);
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}
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}
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}

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