C# Starter L04-Collections

1. Mohammad Shaker mohammadshaker.com C# Programming Course @ZGTRShaker 2011, 2012, 2013, 2014 C# Starter L04 – Collections

2. Collections

3. Collections using System; using System.Collections.Generic; namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { List<int> myInts = new List<int>(); myInts.Add(1); myInts.Add(2); myInts.Add(3); for (int i = 0; i < myInts.Count; i++) { Console.WriteLine("MyInts: {0}", myInts[i]); } } } }

9. Collections using System; using System.Collections.Generic; namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { List<int> myInts = new List<int>(); myInts.Add(1); myInts.Add(2); myInts.Add(3); for (int i = 0; i < myInts.Count; i++) { Console.WriteLine("MyInts: {0}", myInts[i]); } } } } MyInts: 1 MyInts: 2 MyInts: 3 Press any key to continue...

10. Collections - Dictionaries • Let’s have the following class namespace ConsoleApplicationCourseTest { public class Customer { public Customer(int id, string name) { _id = id; _name = name; } private int _id; public int ID { get { return _id; } set { _id = value; } } private string _name; public string Name { get { return _name; } set { _name = value; } } } }

11. Collections • And have the following main namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { Dictionary<int, Customer> customers = new Dictionary<int, Customer>(); Customer cust1 = new Customer(1, "Cust 1"); Customer cust2 = new Customer(2, "Cust 2"); Customer cust3 = new Customer(3, "Cust 3"); customers.Add(cust1.ID, cust1); customers.Add(cust2.ID, cust2); customers.Add(cust3.ID, cust3); foreach (KeyValuePair<int, Customer> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value.Name); } } } }

12. Collections namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { Dictionary<int, Customer> customers = new Dictionary<int, Customer>(); Customer cust1 = new Customer(1, "Cust 1"); Customer cust2 = new Customer(2, "Cust 2"); Customer cust3 = new Customer(3, "Cust 3"); customers.Add(cust1.ID, cust1); customers.Add(cust2.ID, cust2); customers.Add(cust3.ID, cust3); foreach (KeyValuePair<int, Customer> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value.Name); } } } }

13. Collections namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { Dictionary<int, Customer> customers = new Dictionary<int, Customer>(); Customer cust1 = new Customer(1, "Cust 1"); Customer cust2 = new Customer(2, "Cust 2"); Customer cust3 = new Customer(3, "Cust 3"); customers.Add(cust1.ID, cust1); customers.Add(cust2.ID, cust2); customers.Add(cust3.ID, cust3); foreach (KeyValuePair<int, Customer> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value.Name); } } } }

14. Collections namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { Dictionary<int, Customer> customers = new Dictionary<int, Customer>(); Customer cust1 = new Customer(1, "Cust 1"); Customer cust2 = new Customer(2, "Cust 2"); Customer cust3 = new Customer(3, "Cust 3"); customers.Add(cust1.ID, cust1); customers.Add(cust2.ID, cust2); customers.Add(cust3.ID, cust3); foreach (KeyValuePair<int, Customer> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value.Name); } } } } Customer ID: 1, Name: Cust 1 Customer ID: 2, Name: Cust 2 Customer ID: 3, Name: Cust 3 Press any key to continue...

15. Collections namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { Dictionary<int, string> customers = new Dictionary<int, string>(); for (int i = 0; i < 3; i++) { customers.Add(i,"Cust" + i); } foreach (KeyValuePair<int, string> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value); } Console.WriteLine(); customers[1] = "ZGTR"; foreach (KeyValuePair<int, string> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value); } } } }

16. Collections namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { Dictionary<int, string> customers = new Dictionary<int, string>(); for (int i = 0; i < 3; i++) { customers.Add(i,"Cust" + i); } foreach (KeyValuePair<int, string> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value); } Console.WriteLine(); customers[1] = "ZGTR"; foreach (KeyValuePair<int, string> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value); } } } }

17. Collections namespace ConsoleApplicationCourseTest { class MainClass { public static void Main(String[] args) { Dictionary<int, string> customers = new Dictionary<int, string>(); for (int i = 0; i < 3; i++) { customers.Add(i,"Cust" + i); } foreach (KeyValuePair<int, string> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value); } Console.WriteLine(); customers[1] = "ZGTR"; foreach (KeyValuePair<int, string> custKeyVal in customers) { Console.WriteLine("Customer ID: {0}, Name: {1}", custKeyVal.Key, custKeyVal.Value); } } } } Customer ID: 0, Name: Cust0 Customer ID: 1, Name: Cust1 Customer ID: 2, Name: Cust2 Customer ID: 0, Name: Cust0 Customer ID: 1, Name: ZGTR Customer ID: 2, Name: Cust2 Press any key to continue...

18. Collections • System.Collections.Generic • System.Collections

19. Collections • foreach danger – NEVER EVER manipulate (insertion, deletion) a collection in a “foreach” statement – Just iterate (and/or update if you want.) – But Why?

20. Collections private void button1_Click(object sender, EventArgs e) { System.Collections.ArrayList arrList = new ArrayList(); arrList.Add(new Button()); arrList.Add(new TextBox()); arrList.Add(new ComboBox()); arrList.Add(new ListBox()); foreach (var item in arrList) { arrList.Remove(item); } }

21. Collections private void Test(){ System.Collections.ArrayList arrList = new ArrayList(); arrList.Add(new Button()); arrList.Add(new TextBox()); arrList.Add(new ComboBox()); arrList.Add(new ListBox()); foreach (var item in arrList) { arrList.Remove(item); } }

22. Collections

23. Collections private void Test(){ { System.Collections.ArrayList arrList = new ArrayList(); arrList.Add(new Button()); arrList.Add(new TextBox()); arrList.Add(new ComboBox()); arrList.Add(new ListBox()); arrList.Clear(); } Clearing all the collection!

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42. Collections public static void Main(String[] args) { List<int> list1 = new List<int> { 1, 2, 3, 4, 5 }; foreach (var i in list1) { Console.Write(i + ", "); } Console.WriteLine(); List<int> list2 = list1.ConvertAll(x => 2 * x); foreach (var i in list2) { Console.Write(i + ", "); } }

43. Collections public static void Main(String[] args) { List<int> list1 = new List<int> { 1, 2, 3, 4, 5 }; foreach (var i in list1) { Console.Write(i + ", "); } Console.WriteLine(); List<int> list2 = list1.ConvertAll(x => 2 * x); foreach (var i in list2) { Console.Write(i + ", "); } }

44. Collections 1, 2, 3, 4, 5, 2, 4, 6, 8, 10, Press any key to continue... public static void Main(String[] args) { List<int> list1 = new List<int> { 1, 2, 3, 4, 5 }; foreach (var i in list1) { Console.Write(i + ", "); } Console.WriteLine(); List<int> list2 = list1.ConvertAll(x => 2 * x); foreach (var i in list2) { Console.Write(i + ", "); } }

45. Collections public static void Main() { List<PointF> lpf = new List<PointF>(); lpf.Add(new PointF(27.8F, 32.62F)); lpf.Add(new PointF(99.3F, 147.273F)); lpf.Add(new PointF(7.5F, 1412.2F)); Console.WriteLine(); foreach (PointF p in lpf) { Console.WriteLine(p); } List<Point> lp = lpf.ConvertAll(new Converter<PointF, Point>(PointFToPoint)); Console.WriteLine(); foreach (Point p in lp) { Console.WriteLine(p); } } public static Point PointFToPoint(PointF pf) { return new Point(((int)pf.X), ((int)pf.Y)); }

53. Collections public static void Main() { List<PointF> lpf = new List<PointF>(); lpf.Add(new PointF(27.8F, 32.62F)); lpf.Add(new PointF(99.3F, 147.273F)); lpf.Add(new PointF(7.5F, 1412.2F)); Console.WriteLine(); foreach (PointF p in lpf) { Console.WriteLine(p); } List<Point> lp = lpf.ConvertAll(new Converter<PointF, Point>(PointFToPoint)); Console.WriteLine(); foreach (Point p in lp) { Console.WriteLine(p); } } public static Point PointFToPoint(PointF pf) { return new Point(((int)pf.X), ((int)pf.Y)); } {X=27.8, Y=32.62} {X=99.3, Y=147.273} {X=7.5, Y=1412.2} {X=27,Y=32} {X=99,Y=147} {X=7,Y=1412}

55. Collections string[] names = { "Hartono, Tommy", "Adams, Terry", "Andersen, Henriette Thaulow", "Hedlund, Magnus", "Ito, Shu" }; Random random = new Random(DateTime.Now.Millisecond); string name = names.ElementAt(random.Next(0, names.Length)); Console.WriteLine("The name chosen at random is '{0}'.", name);

61. Collections string[] names = { "Hartono, Tommy", "Adams, Terry", "Andersen, Henriette Thaulow", "Hedlund, Magnus", "Ito, Shu" }; Random random = new Random(DateTime.Now.Millisecond); string name = names.ElementAt(random.Next(0, names.Length)); Console.WriteLine("The name chosen at random is '{0}'.", name); The name chosen at random is 'Ito, Shu'.

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65. Collections • Find, FindAll public List<T> FindAll( Predicate<T> match )

66. Collections // Search predicate returns true if a string ends in "saurus". private static bool EndsWithSaurus(String s) { if ((s.Length > 5) && (s.Substring(s.Length - 6).ToLower() == "saurus")) { return true; } else { return false; } }

67. Collections public static void Main() { List<string> dinosaurs = new List<string> {"Velociraptor", "Deinonychus", "Dilophosaurus"}; Console.WriteLine("TrueForAll(EndsWithSaurus): {0}", dinosaurs.TrueForAll(EndsWithSaurus)); Console.WriteLine("nFind(EndsWithSaurus): {0}", dinosaurs.Find(EndsWithSaurus)); Console.WriteLine("nFindLast(EndsWithSaurus): {0}", dinosaurs.FindLast(EndsWithSaurus)); Console.WriteLine("nFindAll(EndsWithSaurus):"); List<string> sublist = dinosaurs.FindAll(EndsWithSaurus); foreach (string dinosaur in sublist) { Console.WriteLine(dinosaur); } Console.WriteLine("n{0} elements removed by RemoveAll(EndsWithSaurus).", dinosaurs.RemoveAll(EndsWithSaurus)); Console.WriteLine("nList now contains:"); foreach (string dinosaur in dinosaurs) { Console.WriteLine(dinosaur); } Console.WriteLine("nExists(EndsWithSaurus): {0}", dinosaurs.Exists(EndsWithSaurus)); }

68. Collections // Search predicate returns true if a string ends in "saurus". private static bool EndsWithSaurus(String s) { if ((s.Length > 5) && (s.Substring(s.Length - 6).ToLower() == "saurus")) { return true; } else { return false; } }

69. Collections TrueForAll(EndsWithSaurus): False Find(EndsWithSaurus): Dilophosaurus FindLast(EndsWithSaurus): Dilophosaurus FindAll(EndsWithSaurus): Dilophosaurus 1 elements removed by RemoveAll(EndsWithSaurus). List now contains: Velociraptor Deinonychus Exists(EndsWithSaurus): False Press any key to continue...

70. Collections 1: public sealed class Employee 2: { 3: public long Id { get; set; } 4: public string Name { get; set; } 5: public double Salary { get; set; } 6: } 1: // empty 2: var noEmployeeList = new List<Employee>(); 3: 4: // many items 5: var employees = new List<Employee> 6: { 7: new Employee { Id = 1, Name = "Jim Smith", Salary = 12345.50 }, 8: new Employee { Id = 7, Name = "Jane Doe", Salary = 31234.50 }, 9: new Employee { Id = 9, Name = "John Doe", Salary = 13923.99 }, 10: new Employee { Id = 13, Name = "Jim Smith", Salary = 30123.49 }, 11: //... etc... 12: };

71. Collections 1: public sealed class Employee 2: { 3: public long Id { get; set; } 4: public string Name { get; set; } 5: public double Salary { get; set; } 6: } 1: // empty 2: var noEmployeeList = new List<Employee>(); 3: 4: // many items 5: var employees = new List<Employee> 6: { 7: new Employee { Id = 1, Name = "Jim Smith", Salary = 12345.50 }, 8: new Employee { Id = 7, Name = "Jane Doe", Salary = 31234.50 }, 9: new Employee { Id = 9, Name = "John Doe", Salary = 13923.99 }, 10: new Employee { Id = 13, Name = "Jim Smith", Salary = 30123.49 }, 11: //... etc... 12: }; A sealed class cannot be inherited. It is an error to use a sealed class as a base class. Use the sealed modifier in a class declaration to prevent inheritance of the class. It is not permitted to use the abstract modifier with a sealed class. Structs are implicitly sealed; therefore, they cannot be inherited

72. Collections • Like First(), the Last() method will throw if there are no items (or no matches in the case of predicates) in the enumerable: • The LastOrDefault() methods will return a default(TSource) if the list is empty or no matches are found: 1: // throws at runtime because empty enumerable. 2: var empty = noEmployeeList.Last(); 3: 4: // this line will throw at runtime because there is no item that matches 5: // even though the enumerable itself is not empty 6: var noMatch = employees.Last(e => e.Id == 20); 1: // returns default(Employee) -- null -- because list is empty 2: var empty = noEmployeeList.LastOrDefault(); 3: 4: // returns default(Employee) -- null -- because no item matches predicate. 5: var noMatch = employees.Last(e => e.Id == 20);

73. Collections • ElementAt() 1: 2: // returns the second employee (index == 1) which is Jane Doe, Id == 7 3: var janeDoe = employees.ElementAt(1); 4: 5: // since there's not 30 employees, this one will throw exception 6: var willThrow = employees.ElementAt(30); 7: 8: // returns null because there aren't 30 employees, but we used the OrDefault flavor. 9: var noMatch = employees.ElementAtOrDefault(30);

74. Collections • Stack public class SamplesStack { public static void Main() { // Creates and initializes a new Stack. Stack myStack = new Stack(); myStack.Push("Hello"); myStack.Push("World"); myStack.Push("!"); // Displays the properties and values of the Stack. Console.WriteLine("myStack"); Console.WriteLine("tCount: {0}", myStack.Count); Console.Write("tValues:"); PrintValues(myStack); } public static void PrintValues(IEnumerable myCollection) { foreach (Object obj in myCollection) Console.Write(" {0}", obj); Console.WriteLine(); } }

75. Collections • Stack public class SamplesStack { public static void Main() { // Creates and initializes a new Stack. Stack myStack = new Stack(); myStack.Push("Hello"); myStack.Push("World"); myStack.Push("!"); // Displays the properties and values of the Stack. Console.WriteLine("myStack"); Console.WriteLine("tCount: {0}", myStack.Count); Console.Write("tValues:"); PrintValues(myStack); } public static void PrintValues(IEnumerable myCollection) { foreach (Object obj in myCollection) Console.Write(" {0}", obj); Console.WriteLine(); } } myStack Count: 3 Values: ! World Hello Press any key to continue...

76. Play more with Collections

77. More Collections Functionalities • Let’s have the following class public class PointClass { public float XLocation { set; get; } public float YLocation { set; get; } public PointClass(float xLocation, float yLocation) { this.XLocation = xLocation; this.YLocation = yLocation; } public override string ToString() { return String.Format("X = {0}, Y = {1}", this.XLocation, this.YLocation); } }

78. More Collections Functionalities public class IsTest { public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; PrintToConsole(listOfPoints, "Before Sorting"); listOfPoints.Sort(); PrintToConsole(listOfPoints, "After default sorting"); } }

80. More Collections Functionalities public class IsTest { public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; PrintToConsole(listOfPoints, "Before Sorting"); listOfPoints.Sort(); PrintToConsole(listOfPoints, "After default sorting"); } }

82. More Collections Functionalities

83. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static int SortByXLocation(PointClass point1, PointClass point2) { if (point1.XLocation > point2.XLocation) return +1; else if (point1.XLocation < point2.XLocation) return -1; else return 0; } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; PrintToConsole(listOfPoints, "Before sorting"); listOfPoints.Sort(SortByXLocation); PrintToConsole(listOfPoints, "After our cool sorting!"); }

84. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static int SortByXLocation(PointClass point1, PointClass point2) { if (point1.XLocation > point2.XLocation) return +1; else if (point1.XLocation < point2.XLocation) return -1; else return 0; } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; PrintToConsole(listOfPoints, "Before sorting"); listOfPoints.Sort(SortByXLocation); PrintToConsole(listOfPoints, "After our cool sorting!"); }

85. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static int SortByXLocation(PointClass point1, PointClass point2) { if (point1.XLocation > point2.XLocation) return +1; else if (point1.XLocation < point2.XLocation) return -1; else return 0; } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; PrintToConsole(listOfPoints, "Before sorting"); listOfPoints.Sort(SortByXLocation); PrintToConsole(listOfPoints, "After our cool sorting!"); } Before sorting X = 1, Y = 0 X = 1, Y = 0 X = 2, Y = 0 X = 0, Y = 0 After our cool sorting! X = 0, Y = 0 X = 1, Y = 0 X = 1, Y = 0 X = 2, Y = 0 Press any key to continue...

86. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static int SortByXLocation(PointClass point1, PointClass point2) { if (point1.XLocation > point2.XLocation) return +1; else if (point1.XLocation < point2.XLocation) return -1; else return 0; } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; PrintToConsole(listOfPoints, "Before sorting"); listOfPoints.Sort(SortByXLocation); PrintToConsole(listOfPoints, "After our cool sorting!"); } Before sorting X = 1, Y = 0 X = 1, Y = 0 X = 2, Y = 0 X = 0, Y = 0 After our cool sorting! X = 0, Y = 0 X = 1, Y = 0 X = 1, Y = 0 X = 2, Y = 0 Press any key to continue...

90. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(1, 0))); }

91. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(1, 0))); } False Press any key to continue...

92. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(1, 0))); } False Press any key to continue... Why?!

93. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(1, 0))); } False Press any key to continue... Because it’s comparing References not Values

94. More Collections Functionalities public static void PrintToConsole(List<PointClass> list, string Msg) { Console.WriteLine(Msg); foreach (var point in list) { Console.WriteLine(point.ToString()); } } public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(1, 0))); } False Press any key to continue... So, what to do to compare values?!

96. More Collections Functionalities public class PointClass : IEquatable<PointClass> { public float XLocation { set; get; } public float YLocation { set; get; } public PointClass(float xLocation, float yLocation) { this.XLocation = xLocation; this.YLocation = yLocation; } public override string ToString() { return String.Format("X = {0}, Y = {1}", this.XLocation, this.YLocation); } public bool Equals(PointClass other) { if ((this.XLocation == other.XLocation) && (this.YLocation == other.YLocation)) { return true; } else { return false; } } }

101. More Collections Functionalities public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(0, 0))); }

102. More Collections Functionalities public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(0, 0))); } True Press any key to continue...

103. More Collections Functionalities public static void Main() { List<PointClass> listOfPoints = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 0), new PointClass(0, 0) }; Console.WriteLine(listOfPoints.Contains(new PointClass(0, 0))); } True Press any key to continue...

104. “Cross” Collections

105. “CROSS” Collections public class PointClass { public float XLocation { set; get; } public float YLocation { set; get; } public PointClass(float xLocation, float yLocation) { this.XLocation = xLocation; this.YLocation = yLocation; } public override string ToString() { return String.Format("X = {0}, Y = {1}", this.XLocation, this.YLocation); } }

106. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); }

109. “CROSS” Collections

111. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); foreach (PointClass point in dic["LabsLocations"]) { Console.WriteLine(point); } }

112. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); foreach (PointClass point in dic["LabsLocations"]) { Console.WriteLine(point); } } X = 1, Y = 7 X = 10, Y = 2 Press any key to continue...

113. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].ForEach(PrintMe); } private static void PrintMe(PointClass point) { Console.WriteLine(point); }

114. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].ForEach(PrintMe); } private static void PrintMe(PointClass point) { Console.WriteLine(point); } X = 1, Y = 7 X = 10, Y = 2 Press any key to continue...

116. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].Add(new PointClass(8,8)); }

118. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].Add(new PointClass(8,8)); Console.WriteLine(dic["LabsLocations"][2]); }

119. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].Add(new PointClass(8,8)); Console.WriteLine(dic["LabsLocations"][2]); }

120. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].Add(new PointClass(8,8)); Console.WriteLine(dic["LabsLocations"][2]); } X = 8, Y = 8 Press any key to continue...

121. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].Add(new PointClass(8,8)); Console.WriteLine(dic["LabsLocations"].Last()); }

122. “CROSS” Collections public static void Main() { List<PointClass> listOfHalls = new List<PointClass>() { new PointClass(1, 0), new PointClass(1, 0), new PointClass(2, 3), }; List<PointClass> listOfLabs = new List<PointClass>() { new PointClass(1, 7), new PointClass(10, 2), }; Dictionary<string, List<PointClass>> dic = new Dictionary<string, List<PointClass>>(); dic.Add("HallsLocations", listOfHalls); dic.Add("LabsLocations", listOfLabs); dic["LabsLocations"].Add(new PointClass(8,8)); Console.WriteLine(dic["LabsLocations"].Last()); } X = 8, Y = 8 Press any key to continue...

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