來自多個表的實體框架不同記錄

Question

我試圖通過連接多個表來獲得不同的值。 有人可以告訴我如何在以下代碼中執行相同的操作嗎？

請參見下面的示例代碼：

var distinctValues = (from a in dataContext.A_Table
                      join b in dataContext.B_Table on a.EmpID equals b.EmpID
                      join c in dataContext.C_Table on b.SomeID equals c.ID
                      where a.IsActive == true
                            && a.ID == id
                      select new NewClass()
                                 {
                                    ID = c.ID,
                                    Name = c.Name
                                 }).ToList();

Answer 1

好吧，這應該不需要很多更改就可以工作，盡管我會完全用表達式寫出來：

var distinctValues = (from a in dataContext.A_Table
                      join b in dataContext.B_Table
                      on a.EmpID equals b.EmpID
                      join c in dataContext.C_Table
                      on b.SomeID equals c.ID
                      where a.IsActive == true
                      && a.ID == id
                      select new NewClass()
                      {
                          ID = c.ID,
                          Name = c.Name
                      }).ToList()
                      .GroupBy(x=>new {ID = x.ID,Name = x.Name})
                      .Select(x=>new {ID = x.Key.ID,Name = x.Key.Name});