в 15:31, 26 мая 2010

2010-05-26T15:31:35Z

Admin: 1 версия

2010-05-26T12:11:41Z

1 версия

Новая страница

==extends List==

<source lang="csharp">
using System;
using System.Collections.Generic;
using System.Text;
public static class VectorDelegates {
public static int Compare(Vector x, Vector y) {
if (x.R > y.R) {
return 1;
} else if (x.R < y.R) {
return -1;
}
return 0;
}
public static bool TopRightQuadrant(Vector target) {
if (target.Theta >= 0.0 && target.Theta <= 90.0) {
return true;
} else {
return false;
}
}
}
public class Vectors : List<Vector> {
public Vectors() {
}
public Vectors(IEnumerable<Vector> initialItems) {
foreach (Vector vector in initialItems) {
Add(vector);
}
}
public string Sum() {
StringBuilder sb = new StringBuilder();
Vector currentPoint = new Vector(0.0, 0.0);
sb.Append("origin");
foreach (Vector vector in this) {
sb.AppendFormat(" + {0}", vector);
currentPoint += vector;
}
sb.AppendFormat(" = {0}", currentPoint);
return sb.ToString();
}
}
public class Vector {
public double? R = null;
public double? Theta = null;
public double? ThetaRadians {
get {
return (Theta * Math.PI / 180.0);
}
}
public Vector(double? r, double? theta) {
if (r < 0) {
r = -r;
theta += 180;
}
theta = theta % 360;
R = r;
Theta = theta;
}
public static Vector operator +(Vector op1, Vector op2) {
try {
double newX = op1.R.Value * Math.Sin(op1.ThetaRadians.Value)
+ op2.R.Value * Math.Sin(op2.ThetaRadians.Value);
double newY = op1.R.Value * Math.Cos(op1.ThetaRadians.Value)
+ op2.R.Value * Math.Cos(op2.ThetaRadians.Value);
double newR = Math.Sqrt(newX * newX + newY * newY);
double newTheta = Math.Atan2(newX, newY) * 180.0 / Math.PI;
return new Vector(newR, newTheta);
} catch {
return new Vector(null, null);
}
}
public static Vector operator -(Vector op1) {
return new Vector(-op1.R, op1.Theta);
}
public static Vector operator -(Vector op1, Vector op2) {
return op1 + (-op2);
}
public override string ToString() {
string rString = R.HasValue ? R.ToString() : "null";
string thetaString = Theta.HasValue ? Theta.ToString() : "null";
return string.Format("({0}, {1})", rString, thetaString);
}
}
class Program {
static void Main(string[] args) {
Vectors route = new Vectors();
route.Add(new Vector(2.0, 90.0));
route.Add(new Vector(1.0, 180.0));
route.Add(new Vector(0.5, 45.0));
route.Add(new Vector(2.5, 315.0));
Console.WriteLine(route.Sum());
Comparison<Vector> sorter = new Comparison<Vector>(VectorDelegates.rupare);
route.Sort(sorter);
Console.WriteLine(route.Sum());
Predicate<Vector> searcher = new Predicate<Vector>(VectorDelegates.TopRightQuadrant);
Vectors topRightQuadrantRoute = new Vectors(route.FindAll(searcher));
Console.WriteLine(topRightQuadrantRoute.Sum());
}
}

</source>

==List.Add==

<source lang="csharp">
using System;
using System.Collections.Generic;
public class MainClass
{
static void Main() {
List<int> intList = new List<int>();
intList.Add( 1 );
intList.Add( 2 );
intList.Add( 3 );
intList.Add( 4 );
foreach( int n in CreateReverseIterator(intList) ) {
Console.WriteLine( n );
}
}
static IEnumerable<T> CreateReverseIterator<T>( IList<T> list ) {
int count = list.Count;
for( int i = count-1; i >= 0; --i ) {
yield return list[i];
}
}
}

</source>

==List.AsReadOnly()==

<source lang="csharp">
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
public class MainClass
{
public static void Main()
{
List<int> intList = new List<int>(new int[] { 3, 5, 15, 1003, 25 });
ReadOnlyCollection<int> roList = intList.AsReadOnly();
}
}

</source>

==List.Capacity==

<source lang="csharp">
using System;
using System.Collections.Generic;

class MainClass {
public static void Main() {
List<char> lst = new List<char>();

Console.WriteLine("Initial number of elements: " +
lst.Count);

Console.WriteLine();

Console.WriteLine("Adding 6 elements");
lst.Add("C");
lst.Add("A");
lst.Add("E");
lst.Add("B");
lst.Add("D");
lst.Add("F");

Console.WriteLine("Number of elements: " +
lst.Count);

Console.WriteLine("Adding 20 more elements");
// Add enough elements to force lst to grow.
for(int i=0; i < 20; i++)
lst.Add((char)("a" + i));
Console.WriteLine("Current capacity: " +
lst.Capacity);
Console.WriteLine("Number of elements after adding 20: " +
lst.Count);
Console.Write("Contents: ");
foreach(char c in lst)
Console.Write(c + " ");
Console.WriteLine("\n");
}
}

</source>

==List.ConvertAll==

<source lang="csharp">

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
public class MainClass
{
public static void Main()
{
List<string> stringList1 = new List<string>(new string[] { "99", "182", "15" });
List<int> intList1 = stringList1.ConvertAll<int>(Convert.ToInt32);
}
}

</source>

==List.Count==

<source lang="csharp">

using System;
using System.Collections.Generic;

class MainClass {
public static void Main() {
List<char> lst = new List<char>();

Console.WriteLine("Initial number of elements: " +
lst.Count);

Console.WriteLine();

Console.WriteLine("Adding 6 elements");
lst.Add("C");
lst.Add("A");
lst.Add("E");
lst.Add("B");
lst.Add("D");
lst.Add("F");

Console.WriteLine("Number of elements: " +
lst.Count);

Console.Write("Current contents: ");
for(int i=0; i < lst.Count; i++)
Console.Write(lst[i] + " ");
Console.WriteLine("\n");
}
}

</source>

==List.ForEach==

<source lang="csharp">
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
public class MainClass
{
public static void Main()
{
List<int> intList = new List<int>(new int[] { 3, 5, 15, 1003, 25 });

intList.ForEach(delegate(int x) { Console.WriteLine(x); });
}
}

</source>

==List.Remove()==

<source lang="csharp">
using System;
using System.Collections.Generic;

class MainClass {
public static void Main() {
List<char> lst = new List<char>();

Console.WriteLine("Initial number of elements: " +
lst.Count);

Console.WriteLine();

Console.WriteLine("Adding 6 elements");
lst.Add("C");
lst.Add("A");
lst.Add("E");
lst.Add("B");
lst.Add("D");
lst.Add("F");

Console.WriteLine("Number of elements: " +
lst.Count);

Console.WriteLine("Removing 2 elements");
// Remove elements from the array list.
lst.Remove("F");
lst.Remove("A");

Console.WriteLine("Number of elements: " +
lst.Count);
}
}

</source>

==new List<T>()==

<source lang="csharp">
using System.Collections.Generic;
using System;

class MainClass
{
public static void Main(string[] args)
{
List<MyClass> list = new List<MyClass>();
list.Add(new MyClass());
MyClass ass2 = list[0];
Console.WriteLine("\nFound in list: {0}", ass2);
}
}
class MyClass {

public override string ToString(){

return "my class";
}

}

</source>

← Предыдущая	Версия 15:31, 26 мая 2010
(нет различий)

Csharp/C Sharp by API/System.Collections.Generic/List - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия