Use join key word : Join « LINQ « C# / CSharp Tutorial

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C# / CSharp Tutorial » LINQ » Join 
22.8.2.Use join key word
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 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<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"}
            };
        List<Role> roles = new List<Role> {
              new Role  ID = 1, Role = "Manager" },
              new Role  ID = 2, Role = "Developer" }
            };
        var query = from p in people
                    join r in roles on p.IDRole equals r.ID
                    select p;
    }
}
22.8.Join
22.8.1.Join two object lists
22.8.2.Use join key word
22.8.3.Join three object list
22.8.4.Use Join on
22.8.5.Join Operator
22.8.6.Cartesian Join demo
22.8.7.Use == in join
22.8.8.Simple Join
22.8.9.OrderBy joined value
22.8.10.Join on substring
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