如何使用Linq将列表集合添加到列表中？

Question

我有一个列表

List<List<Employee>> EmployeeListCollection; 

，并希望

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

什么是查询？

Answer 1

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

Answer 2

试试这个：

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