Csharp/C Sharp/Generics/Generic Collections
Содержание
Add Collection Items with IComparable interface implementation
<source lang="csharp"> using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization;
public class Customer : System.IComparable {
private int _id;
private string _name;
private string _rating;
private static SortOrder _order;
public enum SortOrder {
Ascending = 0,
Descending = 1
}
public Customer(int id, string name)
: this(id, name, "Other") {
}
public Customer(int id, string name, string rating) {
this._id = id;
this._name = name;
this._rating = rating;
}
public int Id {
get { return this._id; }
set { this._id = value; }
}
public string Name {
get { return this._name; }
set { this._name = value; }
}
public string Rating {
get { return this._rating; }
set { this._rating = value; }
}
public static SortOrder Order {
get { return _order; }
set { _order = value; }
}
public override bool Equals(Object obj) {
bool retVal = false;
if (obj != null) {
Customer custObj = (Customer)obj;
if ((custObj.Id == this.Id) &&
(custObj.Name.Equals(this.Name) &&
(custObj.Rating.Equals(this.Rating))))
retVal = true;
}
return retVal;
}
public override string ToString() {
return this._id + ": " + this._name;
}
public int CompareTo(Object obj) {
switch (_order) {
case SortOrder.Ascending:
return this.Name.rupareTo(((Customer)obj).Name);
case SortOrder.Descending:
return (((Customer)obj).Name).rupareTo(this.Name);
default:
return this.Name.rupareTo(((Customer)obj).Name);
}
}
} public class CollectionTest {
public static void Main() {
Collection<Customer> custColl = new Collection<Customer>();
custColl.Add(new Customer(1, "S"));
custColl.Add(new Customer(2, "K"));
custColl.Add(new Customer(3, "T"));
custColl.Insert(1, new Customer(4, "Inserted Employee"));
custColl[3] = new Customer(9, "F");
foreach (Customer cust in custColl)
Console.Out.WriteLine(cust);
}
}
</source>
Add object in a hierarchy into a generic Collection
<source lang="csharp">
using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Text; public class Chicken : Animal {
public void LayEgg() {
Console.WriteLine("{0} Animal.", name);
}
public Chicken(string newName)
: base(newName) {
}
} public class Cow : Animal {
public void Milk() {
Console.WriteLine("{0} cow.", name);
}
public Cow(string newName)
: base(newName) {
}
} public abstract class Animal {
protected string name;
public string Name {
get {
return name;
}
set {
name = value;
}
}
public Animal() {
name = "animal";
}
public Animal(string newName) {
name = newName;
}
public void Feed() {
Console.WriteLine("{0} is feeding.", name);
}
} class Program {
static void Main(string[] args) {
Collection<Animal> animalCollection = new Collection<Animal>();
animalCollection.Add(new Cow("A"));
animalCollection.Add(new Chicken("B"));
foreach (Animal myAnimal in animalCollection) {
myAnimal.Feed();
}
}
}
</source>
Add user-defined object to generic Collection
<source lang="csharp"> using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Text; class Team {
private string name;
public Team(string name) {
this.name = name;
}
public override string ToString() {
return name;
}
} class Program {
static void Main(string[] args) {
Collection<Team> teams = new Collection<Team>();
teams.Add(new Team("Ferrari"));
teams.Add(new Team("Williams-BMW"));
teams.Add(new Team("Bar-Honda"));
teams.Add(new Team("McLaren-Mercedes"));
foreach (Team t in teams) {
Console.WriteLine(t);
}
}
}
</source>
Generic Collection and List
<source lang="csharp"> using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization; public class CollectionTest {
public static void Main() {
Collection<int> intCollection = new Collection<int>();
List<String> strList = new List<String>();
strList.Add("Val1");
strList.Add("Val2");
Collection<String> strCollection = new Collection<String>(strList);
foreach (String strVal1 in strCollection)
System.Console.WriteLine(strVal1);
strList[0] = "Val Changed";
foreach (String strVal2 in strCollection)
System.Console.WriteLine(strVal2);
}
}
</source>
Generic collection class
<source lang="csharp"> using System; using System.Collections.Generic; public class Bag<T> {
private List<T> items = new List<T>();
public void Add(T item) {
items.Add(item);
}
public T Remove() {
T item = default(T);
if (items.Count != 0) {
Random r = new Random();
int num = r.Next(0, items.Count);
item = items[num];
items.RemoveAt(num);
}
return item;
}
public T[] RemoveAll() {
T[] i = items.ToArray();
items.Clear();
return i;
}
} public class MainClass {
public static void Main(string[] args) {
Bag<string> bag = new Bag<string>();
bag.Add("D");
bag.Add("B");
bag.Add("G");
bag.Add("M");
bag.Add("N");
bag.Add("I");
Console.WriteLine("Item 1 = {0}", bag.Remove());
Console.WriteLine("Item 2 = {0}", bag.Remove());
Console.WriteLine("Item 3 = {0}", bag.Remove());
Console.WriteLine("Item 4 = {0}", bag.Remove());
string[] s = bag.RemoveAll();
}
}
</source>
Sort by Name
<source lang="csharp"> using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Text; using System.Runtime.Serialization;
public class Employee : System.IComparable {
private int _id;
private string _name;
private string _rating;
private static SortOrder _order;
public enum SortOrder {
Ascending = 0,
Descending = 1
}
public Employee(int id, string name)
: this(id, name, "Other") {
}
public Employee(int id, string name, string rating) {
this._id = id;
this._name = name;
this._rating = rating;
}
public int Id {
get { return this._id; }
set { this._id = value; }
}
public string Name {
get { return this._name; }
set { this._name = value; }
}
public string Rating {
get { return this._rating; }
set { this._rating = value; }
}
public static SortOrder Order {
get { return _order; }
set { _order = value; }
}
public override bool Equals(Object obj) {
bool retVal = false;
if (obj != null) {
Employee custObj = (Employee)obj;
if ((custObj.Id == this.Id) &&
(custObj.Name.Equals(this.Name) &&
(custObj.Rating.Equals(this.Rating))))
retVal = true;
}
return retVal;
}
public override string ToString() {
return this._id + ": " + this._name;
}
public int CompareTo(Object obj) {
switch (_order) {
case SortOrder.Ascending:
return this.Name.rupareTo(((Employee)obj).Name);
case SortOrder.Descending:
return (((Employee)obj).Name).rupareTo(this.Name);
default:
return this.Name.rupareTo(((Employee)obj).Name);
}
}
} public class CollectionTest {
public static void Main() {
List<Employee> collCustList = new List<Employee>();
collCustList.Add(new Employee(99, "H", "P"));
collCustList.Add(new Employee(77, "B", "G"));
collCustList.Add(new Employee(55, "B", "G"));
collCustList.Add(new Employee(88, "B", "P"));
collCustList.Add(new Employee(11, "L", "O"));
foreach (Employee cust in collCustList)
Console.Out.WriteLine(cust);
Employee.Order = Employee.SortOrder.Ascending;
collCustList.Sort(delegate(Employee cust1, Employee cust2) {
return Comparer<Employee>.Default.rupare(cust1, cust2);
});
foreach (Employee cust in collCustList)
Console.Out.WriteLine(cust);
Employee.Order = Employee.SortOrder.Descending;
collCustList.Sort(delegate(Employee cust1, Employee cust2) {
return Comparer<Employee>.Default.rupare(cust1, cust2);
});
foreach (Employee cust in collCustList)
Console.Out.WriteLine(cust);
}
}
</source>
