LINQ lambda：如何在没有链接的情况下组合两个表

Question

I have two tables "Foo" and "Bar". I would like to join them on nothing, ie I need it to be a full matrix:

Foo

letters
a
b
c

Bar

numbers
1
2

FooBar

letters	numbers
a	1
b	1
c	1
a	2
b	2
c	2

How do I achieve it using LINQ lambda magic, ie something like

var Foobar = Foo.UnionAll(b => Bar...)...? 

Note both tables are IEnumerable anonymous.

Answer 1

This query should create needed result:

var Foobar = Foo.SelectMany(f => Bar, (f, b) => new { Foo = f, Bar = b});

Answer 2

One option is to use the query syntax of linq:

var Foobar = from f in Foo
             from b in Bar
             select new { f.letters, b.numbers };