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Essential C# 7.0 Errata Document

Essential C# 7.0

by Mark Michaelis ISBN-13: 978-1-5093-0358-8 IISBN-10: 1-5093-0358-8 Copyright © 2018 Pearson Education, Inc. First printing, May 2018

The following corrections will be made in the second printing. (To determine which printing you have, turn to page IV of your book. The last line on that page contains the printing information.)

Found by Chapter Page Correction
Rob Mantel 1 16 Changed 'HelloWorld.exe' to 'dotnet run'
Rob Mantel 1 29 Change class name from 'Comment Samples' to CommentSamples
Pieter Le Roux 1 29 Last Line: Table 1.2 shows four different C# comment types. The program in Listing 1.18 Listing 1.19 includes two of these.
Rob Mantel 1 30 Change Listing1.18 reference to Listing1.19
Pieter Le Roux 1 38 Change "(lowercase) to refers to" -> "(lowercase) refers to"
Pieter Le Roux 1 39 Change "C# 5.0 compiler" -> "C# 6.0 compiler"
Zhou Jing 2 75 "The result is that the number variable is available from both the true and false consequence of the if statement but not and even outside the if statement..
Pieter Le Roux 3 93 Change "Listing 3.6" -> "Listing 3.7"
Pieter Le Roux 4 111 Change "The subtraction example" -> "The division and remainder examples"
Pieter Le Roux 4 116 Change "16 bits of a float" -> "32 bits of a float"
Pieter Le Roux 4 122 Change "In this example, notice that the increment operator" -> "In this example, notice that the decrement operator"
Pieter Le Roux 4 132 Change operator in first else if in 4.22: else if(input<9) -> else if(input>9)
Pieter Le Roux 4 140 Change "logical operators are of higher precedence than the relational" -> "relation operators are of higher precedence than the logical"
Kyle Amonson 5 190 Output 5.1 corrected Hello Inigo Montoya! Your initials are I. M.
Kyle Amonson 5 200 “and the optional second argument is…” corrected to “and the second argument is”. The second argument is not optional in the code example.
Pieter Le Roux 5 201 Output 5.4: ERROR: You must specify the URL to be downloaded and the file name Usage: Downloader.exe
Cameron Osborn 5 236 Listing 5.26 typo on Console.WriteLine "FormateException" changed to "FormatException"
Kyle Amonson 6 251 “what you learned in Chapter 4” corrected to “what you learned in Chapter 5”. Introduced in Listing 5.06
Cameron Osborn 6 264 && 266 Listing 6.18 && Listing 6.19 FirstName property gets and sets _LastName backing field
Pieter Le Roux 6 271 Last Line in second paragraph: "DO use nameof for the paramName argument passed into exceptions like ArgumentNullException and ArgumentNullException that take such a parameter. For more information, see Chapter 18."
Pieter Le Roux 6 290 Change "When another Employee class is created" -> "When another instance of the Employee class is created"
Rob Mantel 6 294 && 299 Replace reference to Copy() to CopyTo() and update Listing Name
Kyle Amonson 7 327 “Overloading a member” corrected to “Overriding a member”
Zhou Jing 7 329 Listing 7.13: The Run() method should be public, private void Run().
Rob Mantel 7 334 Change 'therefore no overload' to 'therefore no override'
Pieter Le Roux 7 340 return @$"FirstName: { FirstName + NewLine }" + $"LastName: { LastName + NewLine }"+ $"Address: { Address + NewLine }";
Kyle Amonson 9 390 “DO overload” corrected to “DO override”
Kyle Amonson 9 396 “updates the _Hours value” corrected to “updates the _Degrees value”
Kyle Amonson 9 395 “calls MoveTo() to change Hours” corrected: “calls MoveTo() to change _Degrees”
Pieter Le Roux 10 412 Last paragraph: "so overloading overriding the method" "Consider overloadingoverriding the ToString() method "
Pieter Le Roux 10 446 Change xml comment attribute in 10.17: <data>January 1, 2000</date> -> <date>January 1, 2000</date>
Pieter Le Roux 10 418 Output 10.2: "serialNumber1 reference equals serialNumber2 serialNumber1 equals serialNumber2 serialNumber1 equals serialNumber3"
Pieter Le Roux 10 420 Note: "The implementation of object.Equals(), the default implementation on all objects before overloadingoverriding, relies on ReferenceEquals() alone."
Pieter Le Roux 10 425 Second sentence: "To correct this flaw, it is important to overloadoverride the equals (==) and not equals (!=) operators as well
Pieter Le Roux 11 466 Listing 11.1: // Leveraging C# 2.0's null coelesce operatornull-coalescing operator
Pieter Le Roux 11 467 Last Sentence, first paragraph: null propagation operatornull-conditional operator
Brian Bos 11 467 'ArgumentNullException' is listed twice
Brian Bos 11 472 'ExeptionDispatchInfo.Throw' added missing c to Exception
Brian Bos 11 473 C does not support exception throwing as described. Removed claim
Pieter Le Roux 12 496 "you can see that the type parameter will be used for the internal ItemsInternalItems array, the type for the parameter to the"
Pieter Le Roux 12 501 "constructor that takes the initial values for both First and Secondfirst and second and assigns them to First and Second."
Pieter Le Roux 12 504 "// Use System.ValueTuple<string,Contact> prior to C# 7.0 "
Pieter Le Roux 12 522 "The constraints are specified between the argumentparameter list and the method body, as shown"
Pieter Le Roux 12 530 "Consider the IPairInitializer interface in Listing 12.45."
Pieter Le Roux 12 530 " // Let’s initialize our pair of fruits with an "
Pieter Le Roux 12 532 Listing 12.47: .class privatepublic auto ansi beforefieldinit Stack'1<([mscorlibSystem.Runtime]System.IComparable)** **T> extends [mscorlibSystem.Runtime]System.Object { ... }
Benjamin Michaelis 12 533 Listing 12.48: .class public auto ansi beforefieldinit 'Stack'1'<([mscorlibSystem.Runtime]System.IComparable) T> extends [mscorlibSystem.Runtime]System.Object { .field private !0T[ ] _Iitems ... }
Pieter Le Roux 13 542 "The Func<...> delegate in Listing 13.3, for example, is declared as"
Kevin Bost 13 544 Predicate<int T> should be Predicate<in T>
Kyle Amonson 13 550 "In Listings 13.7 and 13.10" changed to "In Listings 13.7 and 13.11"
Pieter Le Roux 13 552 "the compiler can seeinfer that the lambda"
Benjamin Michaelis 14 578 public Action<float>? OnTemperatureChange { get; set; }
Pieter Le Roux 14 589 Output 14.2: "Enter temperature: 45 Heater: On Error in the application Cooler: Off Enter temperature: 45 Heater: On Cooler: Off There were exceptions thrown by OnTemperatureChange Event subscribers. (Operation is not valid due to the current state of the object.)"
Pieter Le Roux 16 636 tabs in Output 15.9 doesn't reflect Listing 15.21. Fixed by updating source code
Pieter Le Roux 16 651 // ERROR: Cannot implicitly convert type // 'AnonymousType#3#1' to 'AnonymousType#2#3'
Benjamin Michaelis 16 658 Reorder keywords to alphabetical order in Listing 16.1, and add missing keywords ("when")
Pieter Le Roux 16 659 "private static void ShowContextualKeywords1()"
Pieter Le Roux 16 664 Output 16.3 is missing "when"
Pieter Le Roux 16 667 "File.GetLastWriteTime(fileName)"
Pieter Le Roux 16 671 Add "when" to Output 16.6 ("when*" was missing from source code)
Pieter Le Roux 16 673 Add "when" to Output 16.7 ("when*" was missing from source code)
Pieter Le Roux 16 675 "a,c,t,a,d,d,*,a,, ,l,i,a, .... " (removing space)
Pieter Le Roux 16 677 in Listing 16.16 and Listing 16.17, add "!" prior to "word. Contains('*')" to match Listing 16.01
Pieter Le Roux 17 685 Saw List[6] could throw error. Changed to "{ List[6list.Count - 1] }
Pieter Le Roux 17 712 "as you did in both CSharpPrimitiveTypesBuiltInTypes"
Pieter Le Roux 18 728 errorMessage listed twice in listing 18.3
Pieter Le Roux 18 762 two times in same bullet "persondata.nonExistentMethodCallStillCompiles()" in accordance to listing 18.29
Pieter Le Roux 18 765 "let's reexamine Listing 18.3118.30. Notice the call to retrieve the "FirstName" element:"
Pieter Le Roux 19 791 "The worker thread will write periodsplus signs to the console
Pieter Le Roux 19 792 lambda expression prints out dasheshyphens to the console repeatedly.
Pieter Le Roux 19 807 "(c)(3)"