c# - 通过搜索组合键 C# 查找 list 项

Question

我想使用 List 查找在特定日期分配给员工的部门。employeeID 和日期的组合将是唯一的，这意味着一名员工将在特定日期仅分配到一个部门。

List<clsEmployee> _items = new List<clsEmployee>();

_items.Add(new clsEmployee() 
{EmpId=100,Date="05/05/2017",DeptAssigned="Grocery"});
_items.Add(new clsEmployee() 
{EmpId=100,Date="06/05/2017",DeptAssigned="Clothing"});
_items.Add(new clsEmployee() 
{EmpId=100,Date="07/05/2017",DeptAssigned="Crockery"});

_items.Add(new clsEmployee() 
{EmpId=101,Date="05/05/2017",DeptAssigned="cosmetics"});
_items.Add(new clsEmployee() 
{EmpId=101,Date="06/05/2017",DeptAssigned="gardening"});
_items.Add(new clsEmployee() 
{EmpId=101,Date="07/05/2017",DeptAssigned="grocery"});


  clsEmployee objEmployee = new clsEmployee ();
  objEmployee = _items.Find(x => x.EmpId == 100);
//i want something like objEmployee = _items.Find(x => x.EmpId==100 
 //&& x => x.Date="05/05/2017");
string DeptAssignedToEmp = objEmployee.DeptAssigned;
//expected result - grocery in this case.

Answer 1

简单，使用 && 而不使用另一个 x =>

clsEmployee objEmployee = _items.Find(x => x.EmpId == 100 && x.Date == "05/05/2017");

您还可以使用 LINQ:

clsEmployee objEmployee = _items.FirstOrdefault(x => x.EmpId == 100 && x.Date == "05/05/2017");

旁注:不要将字符串用于日期属性，而应将字符串用于 DateTime。