中的SelectMany功能LINQ

Question

var collecion = new List<List<ToTest>> 
        { 
         new List<ToTest>{new ToTest {Id = 1, Name = "some name"}, new ToTest {Id = 4, Name = "some name2"}}, 
         new List<ToTest>{new ToTest {Id = 2, Name = "some name"}, new ToTest {Id = 5, Name = "some name2"}}, 
         new List<ToTest>{new ToTest {Id = 3, Name = "some name"}, new ToTest {Id = 6, Name = "some name2"}}, 
        }; 

我想使用LINQ的功能，而不是拉姆達LINQ

var result1 = collecion.SelectMany(q => q).ToList(); 

Answer 1

var result1 = from collection in collections 
       from item in collection 
       select item;