我正在尝试编写查询以获取不同的部门以及与该部门关联的员工人数（计数）
但是我无法在linq中找到确切的查询：
var empname = new List<EmpName>();
var empadd = new List<EmpAddress>();
var empsal = new List<EmpSalary>();
var empdep = new List<EmpDepartment>();
empdep.Add(new EmpDepartment { EmployeeID = 101, Department = "CIV" });
empdep.Add(new EmpDepartment { EmployeeID = 105, Department = "CIV" });
empdep.Add(new EmpDepartment { EmployeeID = 106, Department = "CIV" });
empdep.Add(new EmpDepartment { EmployeeID = 102, Department = "AEI" });
empdep.Add(new EmpDepartment { EmployeeID = 107, Department = "AEI" });
empdep.Add(new EmpDepartment { EmployeeID = 103, Department = "IES" });
empdep.Add(new EmpDepartment { EmployeeID = 202, Department = "IES" });
empdep.Add(new EmpDepartment { EmployeeID = 203, Department = "IES" });
empdep.Add(new EmpDepartment { EmployeeID = 104, Department = "PIE" });
empdep.Add(new EmpDepartment { EmployeeID = 208, Department = "PIE" });
var results = (from d in empdep
group d.Department by d.EmployeeID into g
select new EmpDetails
{
Department = g.Key.ToString(),
DeptCount = g.Count()
}).ToList();
您可以使用：
var groupedEmploeesByDepartment = empdep.GroupBy(x => x.Department).Select(x => new { Department = x.Key, EmployeesCount = x.Count() });
现在，该信息以Department和EmployeesCount属性定义的匿名类型为IEnumerable 。
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