Merge pull request #125 from ProfessionalCSharp/124-target-typed-new

124 target typed new

Author: christiannagel

1_CS/Collections/DictionarySample/Employee.cs

@@ -1,4 +1,6 @@
-public record Employee
+namespace DictionarySample;
+
+public record Employee
 {
     private readonly string _name;
     private readonly decimal _salary;

1_CS/Collections/DictionarySample/EmployeeId.cs

@@ -1,4 +1,6 @@
-public class EmployeeIdException : Exception
+namespace DictionarySample;
+
+public class EmployeeIdException : Exception
 {
     public EmployeeIdException(string message) : base(message) { }
 }

1_CS/Collections/DictionarySample/Program.cs

@@ -1,14 +1,16 @@
-EmployeeId idKyle = new("J18");
-Employee kyle = new Employee(idKyle, "Kyle Bush", 138_000.00m );
+using DictionarySample;
+
+EmployeeId idKyle = new("J18");
+Employee kyle = new(idKyle, "Kyle Bush", 138_000.00m );
 
 EmployeeId idMartin = new("J19");
 Employee martin = new(idMartin, "Martin Truex Jr", 73_000.00m);
 
 EmployeeId idKevin = new("S4");
 Employee kevin = new(idKevin, "Kevin Harvick", 116_000.00m);
 
-EmployeeId idDenny = new EmployeeId("J11");
-Employee denny = new Employee(idDenny, "Denny Hamlin", 127_000.00m);
+EmployeeId idDenny = new("J11");
+Employee denny = new(idDenny, "Denny Hamlin", 127_000.00m);
 
 EmployeeId idJoey = new("T22");
 Employee joey = new(idJoey, "Joey Logano", 96_000.00m);

1_CS/Collections/ImmutableCollectionSample/GlobalUsings.cs

@@ -1,4 +1,6 @@
-SimpleArrayDemo();
+using System.Collections.Immutable;
+
+SimpleArrayDemo();
 ImmutableList<Account> accounts = CreateImmutableList();
 UsingABuilder(accounts);
 LinqDemo();

1_CS/Collections/ImmutableCollectionSample/Program.cs

@@ -46,6 +46,9 @@
     Console.WriteLine("object not found in collection");
 }
 
-List<Racer> racers2 = new(new Racer[] {
-               new(12, "Jochen", "Rindt", "Austria", 6),
-               new(22, "Ayrton", "Senna", "Brazil", 41) });
+List<Racer> racers2 = new(
+    new Racer[] 
+    {
+        new(12, "Jochen", "Rindt", "Austria", 6),
+        new(22, "Ayrton", "Senna", "Brazil", 41) 
+    });

1_CS/Collections/ListSamples/Program.cs

@@ -43,6 +43,20 @@ Page 190, the event name should be `NewCarCreated` instead of `NewCarInfo`:
 
 Thanks to [@DanielNikoofar](https://github.com/DanielNikoofar) for reporting this issue!
 
+## Chapter 11, Tasks and Asynchrnous Programming
+
+Page 296 shows this source code:
+
+```csharp
+private readonly static Dictionary<string, string> names = new Dictionary<string, string>();
+```
+
+With C# 9 and **target-typed new expressions**, the code can be written as shown:
+
+```csharp
+private readonly static Dictionary<string, string> names = new();
+```
+
 ## Chapter 20, Security
 
 Page 560, the command