根据条件动态拼接LinQ的where条件字串

var items1 = from c in customer
    where c.Id != null && (1 == 1 ? c.FirstName == "AAA" : true) && (1 == 1 ? c.LastName == "BBB" : true)
     select c;

List<Customer> qwe11 = items1.ToList();

var items = customer.Where(m => m.Id != null);

if (1 == 1)
items = customer.Where(m => m.FirstName == "Johnny");

if (1 == 1)
items = customer.Where(m => m.LastName == "Doe");
List<Customer> qwe = items.ToList();