c# linq join code example

Example 1: linq join

var id = 1;
var query =
   from post in database.Posts
   join meta in database.Post_Metas on post.ID equals meta.Post_ID
   where post.ID == id
   select new { Post = post, Meta = meta };

Example 2: join in linq c#

IList<string> strList1 = new List<string>() { 
    "One", 
    "Two", 
    "Three", 
    "Four"
};

IList<string> strList2 = new List<string>() { 
    "One", 
    "Two", 
    "Five", 
    "Six"
};

var innerJoin = strList1.Join(strList2,
                      str1 => str1, 
                      str2 => str2, 
                      (str1, str2) => str1);

Example 3: join linq lambda

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