獲取linq錯誤組

Question

當我添加linq分組時，出現以下錯誤。

錯誤5「System.Linq.IGrouping」不包含「描述」和沒有擴展方法「說明」接受類型「System.Linq.IGrouping」的第一個參數的定義可以發現（你缺少using指令或程序集引用？）

using (var db = new DataContext()) 
{ 
    var query = from emp in db.Employees 
           .Where(e=> e.IsDeleted == false && e.DivisionId == divisionId) 
       from rev in db.Reviews 
           .Where(r=> r.EmployeeID == emp.EmployeeId && r.IsDeleted == false && r.ReviewPeriodId == reviewPeriodId) 
           .DefaultIfEmpty() 
       from obj in db.Objectives 
           .Where(o=> o.ReviewId == rev.ReviewId && o.IsDeleted == false) 
           .DefaultIfEmpty() 
       from objps in db.ObjectiveProgressStatusLanguages 
           .Where(s=> s.ObjectiveProgressStatusId == obj.ObjectiveProgressStatusId && s.LanguageId == langueageId) 
           .DefaultIfEmpty() 
       group objps by new {objps.Description, objps.StatusId into opsgroup 

       select new 
       { 
        Status = opsgroup.Description, 
        StatusId = opsgroup.StatusId, 
        Count = opsgroup.Count() 
       }; 
    return query.CopyToDataTable(); 

Answer 1

這些領域應該是關鍵的組成部分。嘗試將其更改爲：

select new { 
     Status = opsgroup.Key.Description, 
     StatusId = opsgroup.Key.StatusId, 
     Count = opsgroup.Count() 
    }