c# - 如何使用 Linq 将列表集合添加到列表中？

Question

我有一个清单

List<List<Employee>> EmployeeListCollection;

并且想要

List<Employee> EmployeeList=//all employee in EmployeeListCollection

什么是查询？

Answer 1

List<Employee> EmployeeList = EmployeeListCollection.SelectMany(c => c).ToList();

Answer 2

尝试这个：

List<List<Employee>> EmployeeListCollection;
List<Employee> EmployeeList;
foreach(var emplst in EmployeeListCollection)
{
  foreach(var emp in emplst )
 {
     EmployeeList.add(emp);
 }
}