в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:18:22Z

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==Calling the ToArray Operator==

<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[] names = presidents.OfType<string>().ToArray();
foreach (string name in names)
Console.WriteLine(name);
}
}</source>

==Convert query result to an Array==

<source lang="csharp">using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
class Employee {
int _id;
int _idRole;
string _lastName;
string _firstName;
public int ID {
get { return _id; }
set { _id = value; }
}
public int IDRole {
get { return _idRole; }
set { _idRole = value; }
}
public string LastName {
get { return _lastName; }
set { _lastName = value; }
}
public string FirstName {
get { return _firstName; }
set { _firstName = value; }
}
}
public class MainClass {
public static void Main() {
List<Employee> people = new List<Employee> {
new Employee { ID = 1, IDRole = 1, LastName = "A", FirstName = "B"},
new Employee { ID = 2, IDRole = 2, LastName = "G", FirstName = "T"}
};
var query = from p in people
where p.LastName.Length == 4
select p.LastName;
string[] names = query.ToArray();
for (int i = 0; i < names.Length; i++)
Console.WriteLine(names[i]);
}
}</source>

==Convert query to array==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Linq;
using System.Linq;
class Car
{
public string PetName;
public string Color;
public int Speed;
public string Make;

public override string ToString()
{
return string.Format("Make={0}, Color={1}, Speed={2}, PetName={3}",Make, Color, Speed, PetName);
}
}
class Program
{
static void Main(string[] args)
{
Car[] myCars = new []{
new Car{ PetName = "A", Color = "Silver", Speed = 100, Make = "BMW"},
new Car{ PetName = "B", Color = "Black", Speed = 55, Make = "VW"},
new Car{ PetName = "C", Color = "White", Speed = 43, Make = "Ford"}
};

var subset = (from c in myCars
where c.Speed > 55 select c).ToArray<Car>();
foreach (Car c in subset)
{
Console.WriteLine("{0} is going {1} MPH", c.PetName, c.Speed);
}

}
}</source>

==Convert query to array with ToArray==

<source lang="csharp">using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Reflection;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
class Person {
int _id;
int _idRole;
string _lastName;
string _firstName;
public int ID {
get { return _id; }
set { _id = value; }
}
public int IDRole {
get { return _idRole; }
set { _idRole = value; }
}
public string LastName {
get { return _lastName; }
set { _lastName = value; }
}
public string FirstName {
get { return _firstName; }
set { _firstName = value; }
}
}
class Program {
static void Main(string[] args) {
List<Person> people = new List<Person> {
new Person { ID = 1, IDRole = 1, LastName = "A", FirstName = "B"},
new Person { ID = 2, IDRole = 2, LastName = "G", FirstName = "T"}
};
var query = people
.Where(p => p.ID == 1)
.Select(p => new { p.FirstName, p.LastName })
.ToArray();
people[0].FirstName = "F";
}
}</source>

==Generating an array of double values by first using a query expression with orderby==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
public static void Main() {
double[] doubles = { 1.7, 2.3, 1.9, 4.1, 2.9 };
var sortedDoubles =
from d in doubles
orderby d descending
select d;
var doublesArray = sortedDoubles.ToArray();
Console.WriteLine("Every other double from highest to lowest:");
for (int d = 0; d < doublesArray.Length; d += 2) {
Console.WriteLine(doublesArray[d]);
}
}
}</source>

==To List: convert query result to list==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
public static void Main() {
string[] words = { "ch", "a", "b" };
var sortedWords =
from w in words
orderby w
select w;
var wordList = sortedWords.ToList();
Console.WriteLine("The sorted word list:");
foreach (var w in wordList) {
Console.WriteLine(w);
}
}
}</source>

==Use Conversion Operators ToArray==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
public static void Main() {
double[] doubles = { 1.7, 2.3, 1.9, 4.1, 2.9 };
var sortedDoubles =
from d in doubles
orderby d descending
select d;
var doublesArray = sortedDoubles.ToArray();
Console.WriteLine("Every other double from highest to lowest:");
for (int d = 0; d < doublesArray.Length; d += 2) {
Console.WriteLine(doublesArray[d]);
}
}
}</source>

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в 15:31, 26 мая 2010

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