Question

我想按类

上的WorkGroup.GroupId属性进行分组

public class Employee
{
  public int EmployeeID {get; set;}
  public Group WorkGroup {get; set;}
}

但是我需要输出组名属性（可能有重复但在同一个groupid之间相同）

类似的东西（当然这不起作用）：

var grps = from emp in Emps
          group emp by emp.WorkGroup.GroupID into g
          select new { GroupID = g.Key, Title = g.Key.WorkGroup.GroupTitle,  Employees = g };

我正在寻找允许我这样做的输出：

foreach (var g in grps)
{
  Console.WriteLine(g.Title + "-" + g.GroupID);
  foreach (var e in g.Employees)
  {
     Console.WriteLine(e.EmployeeID);
  }
}

Answer 1

只按ID和标题分组：

var grps = 
    from emp in Emps
    group emp by new 
    { 
        GroupID = emp.WorkGroup.GroupID, 
        GroupTitle = emp.WorkGroup.GroupTitle 
    } into g
    select new 
    { 
        GroupID = g.Key.GroupID, 
        GroupTitle = g.Key.GroupTitle,  
        Employees = g
    };

来自Linq Group By的输出2字段

1 个答案: