Query a list of objects by its property : Object Query « LINQ « C# / CSharp Tutorial

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C# / CSharp Tutorial » LINQ » Object Query 
22.6.4.Query a list of objects by its property
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 = people
                    .Where(p => p.ID == 1)
                    .Select(p => new p.FirstName, p.LastName });
    }
}
22.6.Object Query
22.6.1.Query an array of object by its property value
22.6.2.Select object in a List
22.6.3.Query by Person's FirstName
22.6.4.Query a list of objects by its property
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