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LINQ to Objects
Summary
The term "LINQ to Objects" refers to the use of LINQ queries with any IEnumerable or IEnumerable
LINQ to Objects provides methods that represent a set of standard query operators to retrieve data from any object whose class implements the IEnumerable interface. These queries are performed against in-memory data.
Code Example
For more advanced code example, see LINQ to objects code review.
class Person
{
public Int32 ID { get; set; }
public Int32 IDRole { get; set; }
public String LastName { get; set; }
public String FirstName { get; set; }
}
class Program { static void Main(string[] args) { List<Person> people = new List<Person> { new Person() {ID = 1, IDRole = 1, LastName = "Anderson", FirstName = "Brad"}, new Person() {ID = 2, IDRole = 2, LastName = "Gray", FirstName = "Tom"} };
var query = from p in people where p.ID == 1 select new { p.FirstName, p.LastName };
foreach (var element in query) { Console.WriteLine("Anonymous Type: First Name = {0}, Last Name = {1}", element.FirstName, element.LastName); } Console.WriteLine();
var query2 = from Person p in people where p.ID == 1 select p;
foreach (Person p in query2) { Console.WriteLine("Person Type: First Name = {0}, Last Name = {1}", p.FirstName, p.LastName); } Console.Read(); } }
class Program { static void Main(string[] args) { List<Person> people = new List<Person> { new Person() {ID = 1, IDRole = 1, LastName = "Anderson", FirstName = "Brad"}, new Person() {ID = 2, IDRole = 2, LastName = "Gray", FirstName = "Tom"} };
var query = from p in people where p.ID == 1 select new { p.FirstName, p.LastName };
foreach (var element in query) { Console.WriteLine("Anonymous Type: First Name = {0}, Last Name = {1}", element.FirstName, element.LastName); } Console.WriteLine();
var query2 = from Person p in people where p.ID == 1 select p;
foreach (Person p in query2) { Console.WriteLine("Person Type: First Name = {0}, Last Name = {1}", p.FirstName, p.LastName); } Console.Read(); } }