Question

我想在两个有关系的表之间写一个select。我使用这段代码，但没有结果。请告诉我

 using (doctorEntities de = new doctorEntities())
        {
            var select = from tibase in de.Table_infobase_print
                         from tidetail in de.Table_infodetail_print
                         where tibase.ID == tidetail.ID_infobase 
                         select new
                         {
                             tidetail.services_discription,tidetail.price,tibase.folder_code
                         };
        }

Answer 1

我认为您可能正在寻找加入，无论您是否应该在数据库中有匹配的行时获得结果。目前你还没有对结果做任何事情。

using (doctorEntities de = new doctorEntities())
{
    var results = from tibase in de.Table_infobase_print
                  join tidetail in de.Table_infodetail_print
                  on tibase.ID equals tidetail.ID_infobase 
                  select new
                  {
                      tidetail.services_discription,
                      tidetail.price,
                      tibase.folder_code
                  };
    foreach(var result in results)
    {
        Console.WriteLine("Service description: " + result.services_discription);
    }
}

在实体框架中选择两个表

1 个答案: