1批量添加 db.T_Investigator.AddRange(list)
2批量删除 db.T_Investigator.RemoveRange(list)
3批量修改 for 循环修改。
注意： 先查询出来，最后savechange（），写在一个事务中，一次请求一个上下文。
public int SubmitAll(int[] idList, int userId){int num = 0;using (var pmdb = new ProjectManagementEntities()){using (var tran = pmdb.Database.BeginTransaction()){try{var list = pmdb.T_Investigator.Where(d => idList.Contains(d.InvestigatorID) && d.CreateUserID == userId && d.HasSubmitted == false).ToList();if (list.Count > 0){foreach (var item in list){item.HasSubmitted = true;}num = pmdb.SaveChanges();tran.Commit();}}catch (Exception ex){tran.Rollback();//回滚throw ex;}}}return num;}
网上案例：
EF中的那些批量操作
http://www.cnblogs.com/mcgrady/archive/2015/03/21/4355282.html
