в 15:31, 26 мая 2010

2010-05-26T15:31:35Z

Admin: 1 версия

2010-05-26T12:11:01Z

1 версия

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==Enumerable.Aggregate==

<source lang="csharp">

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass {
public static void Main() {
int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var query = numbers.Aggregate((a, b) => a * b);
}
}

</source>

==Enumerable.Average()==

<source lang="csharp">
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
public static void Main() {
int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
double averageNum = numbers.Average();
Console.WriteLine("The average number is {0}.", averageNum);
}
}

</source>

==Enumerable.Cast==

<source lang="csharp">
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
object[] doubles = {1.0, 2.0, 3.0};
IEnumerable<double> d = doubles.Cast<double>();
Console.Write(d);
}
}

</source>

==Enumerable.Count()==

<source lang="csharp">
using System;
using System.Collections.Generic;
using System.Linq;
static class TestString {
static void Main() {
var count =
"abc 8"
.Where(c => !Char.IsLetter(c))
.Count();
Console.WriteLine(count);
}
}

</source>

==Enumerable.DefaultIfEmpty==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
string name =
presidents.Where(n => n.Equals("H")).DefaultIfEmpty("Missing").First(); Console.WriteLine(name);
}
}

</source>

==Enumerable.Distinct()==

<source lang="csharp">
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = {1, 1, 2, 3, 3};
Console.Write(numbers.Distinct());
}
}

</source>

==Enumerable.ElementAt==

<source lang="csharp">
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};
var query = numbers.ElementAt(4);
Console.Write(query);
}
}

</source>

==Enumerable.ElementAtOrDefault==

<source lang="csharp">
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9};
var query = numbers.ElementAtOrDefault(9);
Console.Write(query);
}
}

</source>

==Enumerable.ElementsAfterSelf==

<source lang="csharp">

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Xml.Linq;
public class MainClass {
public static void Main() {
XElement firstParticipant;
XDocument xDocument = new XDocument(
new XDeclaration("1.0", "UTF-8", "yes"),
new XDocumentType("Books", null, "Books.dtd", null),
new XProcessingInstruction("Book", "out-of-print"),
new XElement("Books",
new XComment("Begin Of List"), firstParticipant =
new XElement("Book",
new XAttribute("type", "Author"),
new XElement("FirstName", "J"),
new XElement("LastName", "R")),
new XElement("Book",
new XAttribute("type", "Author"),
new XElement("FirstName", "E"),
new XElement("LastName", "B")),
new XComment("End Of List")));
foreach (XNode node in firstParticipant.ElementsAfterSelf()) {
Console.WriteLine(node);
}
}
}

</source>

==Enumerable.Empty==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
IEnumerable<string> strings = Enumerable.Empty<string>();
foreach (string s in strings)
Console.WriteLine(s); Console.WriteLine(strings.Count());
}
}

</source>

==Enumerable.First==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"G", "H", "a", "H", "over", "Jack"};
string jones = presidents.Where(n => n.Equals("H")).First();
if (jones != null)
Console.WriteLine("H was found");
else
Console.WriteLine("H was not found");
}
}

</source>

==Enumerable.OrderBy==

<source lang="csharp">
using System;
using System.Linq;
static class TestArray {
static void Main() {
Object[] array = { "String", 12, true, "a" };
var types =
array
.Select(item => item.GetType().Name)
.OrderBy(type => type);
}
}

</source>

==Enumerable.Range==

<source lang="csharp">
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
public static void Main() {
var numbers =
from n in Enumerable.Range(100, 50)
select new { Number = n, OddEven = n % 2 == 1 ? "odd" : "even" };
foreach (var n in numbers) {
Console.WriteLine("The number {0} is {1}.", n.Number, n.OddEven);
}
}
}

</source>

==Enumerable.Repeat==

<source lang="csharp">
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
public static void Main() {
var numbers = Enumerable.Repeat(7, 10);
foreach (var n in numbers) {
Console.WriteLine(n);
}
}
}

</source>

==Enumerable.Where==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] strings = { "one", "two", null, "three" };
Console.WriteLine("Before Where() is called.");
IEnumerable<string> ieStrings = strings.Where(s => s.Length == 3);
Console.WriteLine("After Where() is called.");
foreach (string s in ieStrings) {
Console.WriteLine("Processing " + s);
}
}
}

</source>

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Csharp/C Sharp by API/System.Linq/Enumerable - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия