I find that if you‘re familiar with SQL syntax, using the LINQ query syntax is much clearer, more natural, and makes it easier to spot errors:
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 };
If you‘re really stuck on using lambdas though, your syntax is quite a bit off. Here‘s the same query, using the LINQ extension methods:
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
