Query by Person's FirstName in CSharp

Description

The following code shows how to query by Person's FirstName.

Example


 //w  w  w.  ja v a  2s .c  o m
 
 
  
using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Reflection;

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"},
               new Person { ID = 3, IDRole = 2, LastName = "G", FirstName = "M"},
               new Person { ID = 4, IDRole = 3, LastName = "C", FirstName = "G"}
            };

        var query = from p in people
                    where p.FirstName == "B"
                    select p;
        foreach(var q in query){
           Console.WriteLine(q.ID);
        }
    }
}

The code above generates the following result.





















Home »
  C# Tutorial »
    LINQ »




Operator
Select
Where
OrderBy
Group
Join
Let
LINQ