C# Linq Lambda verbinden und wählen Syntax

Question

Ich suche das Gegenstück von Msql Abfrage:

SELECT per.*,add.addressDescription FROM Persons per 
     JOIN Address add ON per.AddressId = add.AddressId 

Ich habe diese Anfrage:

var query = persons.JOIN(address,per = person.addressId,add = addressId 
    (per,add) => 
    new Persons{ 
       addressDescription = add.addressDescription, 
       PersonId = per.PersonId, 
       PersonFirstName = per.PersonFirstName 
       PersonLastName = per.PersonLastName}) 

Gibt es eine Möglichkeit Persons.addressDescription zu füllen, ohne einzeln zuweisen die anderen Eigenschaften von Persons? Stellen Sie sich vor, wenn Persons 10 weitere Eigenschaften haben.

Ich möchte aus mit Schleifen wie verzichten:

foreach(Person person in PersonList) 
{ 
    foreach(Address address in AddressList) 
    { 
    if(person.addressId == address.addressId){ 
     person.addressDescription = address.addressDescription 
    } 
    } 
} 

Answer 1

var query = persons.join(address, 
    per = person.addressId, 
    add = addressId 
    (per,add) => 
    { 
     per.addressDescription = add.addressDescription; 
     return per; 
    }); 

Answer 2

var id = 1; 
var query = database.Posts // your starting point - table in the "from" statement 
    .Join(database.Post_Metas, // the source table of the inner join 
     post => post.ID,  // Select the primary key (the first part of the "on" clause in an sql "join" statement) 
     meta => meta.Post_ID, // Select the foreign key (the second part of the "on" clause) 
     (post, meta) => new { Post = post, Meta = meta }) // selection 
    .Where(postAndMeta => postAndMeta.Post.ID == id); // where statement