我通过定义一个选择器来解决此问题，该选择器可同时显示键和员工列表.

I solved the problem by defining a selector that projects the Key as well as Employees List.

       var eq = empqueryable.GroupBy("new (State, Department)", "it").Select("new(it.Key as Key, it as Employees)");
       var keyEmplist = (from dynamic dat in eq select dat).ToList();

       foreach (var group in keyEmplist)
       {
           var key = group.Key;
           var elist = group.Employees;

           foreach (var emp in elist)
           {

           }                                          
       }