How do I convert Foreach statement into linq expression?

Question

how to convert below foreach into linq expression?

var list = new List();

foreach (var id in ids)
{
    list.Add(new Book{Id=id});
}
         


        

Answer 1

It's pretty straight forward:

var list = ids.Select(id => new Book { Id = id }).ToList();

Or if you prefer query syntax:

var list = (from id in ids select new Book { Id = id }).ToList();

Also note that the ToList() is only necessary if you really need List. Otherwise, it's generally better to take advantage of Linq's lazy evaluation abilities, and allow the Book objects objects to only be created on demand.