в 15:31, 26 мая 2010

2010-05-26T15:31:18Z

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2010-05-26T11:38:50Z

1 версия

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==Constructor new object with select statement==

<source lang="csharp">
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class Contact {
public int Id;
public string Name;
public static void PublishContacts(Contact[] contacts) {
foreach (Contact c in contacts)
Console.WriteLine("Contact Id: {0} Contact: {1}", c.Id, c.Name);
}
}

public class Employee {
public int id;
public string firstName;
public string lastName;
public static ArrayList GetEmployees() {
ArrayList al = new ArrayList();
al.Add(new Employee { id = 1, firstName = "J", lastName = "R" });
al.Add(new Employee { id = 2, firstName = "W", lastName = "G" });
al.Add(new Employee { id = 3, firstName = "A", lastName = "H" });
return (al);
}
}
public class MainClass {
public static void Main() {
ArrayList alEmployees = Employee.GetEmployees();
Contact[] contacts = alEmployees
.Cast<Employee>()
.Select(e => new Contact {
Id = e.id,
Name = string.Format("{0} {1}", e.firstName, e.lastName)
})
.ToArray<Contact>();
Contact.PublishContacts(contacts);
}
}
</source>

==partitions an array of words into groups according to the first letter of each word.==

<source lang="csharp">
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public class MainClass {
public static void Main() {
string[] words = { "b", "c", "a", "ba", "ae", "ch" };
var wordGroups =
from w in words
group w by w[0] into g
select new { FirstLetter = g.Key, Words = g };
foreach (var g in wordGroups) {
Console.WriteLine("Words that start with the letter "{0}":", g.FirstLetter);
foreach (var w in g.Words) {
Console.WriteLine(w);
}
}
}
}
</source>

==Query a List or objects and create new objects==

<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 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; }
}
}
class Role {
int _id;
string role;
public int ID {
get { return _id; }
set { _id = value; }
}
public string Role {
get { return role; }
set { role = value; }
}
}
class Program {
static void Main(string[] args) {
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"}
};
List<Role> roles = new List<Role> {
new Role { ID = 1, Role = "Manager" },
new Role { ID = 2, Role = "Developer" }
};
var query = from p in people
where p.ID == 1
select new { p.FirstName, p.LastName };
}
}
</source>

==select new==

<source lang="csharp">
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Reflection;
public class MainClass{
public static void Main(){
var q = from m in typeof(int).GetMethods()
orderby m.Name
group m by m.Name into gb
select new {Name = gb.Key};
}
}
</source>

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Csharp/C Sharp/LINQ/select new - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия