protected void Button3_Click(object sender, EventArgs e) { EFFristModelEntities db = new EFFristModelEntities(); //var userInfoList = from u in db.UserInfo // where u.ID == 345 // select u; //UserInfo userInfo=userInfoList.FirstOrDefault();//返回第一个元素,如果没有的话,返回null //if (userInfo != null) //{ // // db.UserInfo.Remove(userInfo); // db.Entry<UserInfo>(userInfo).State = System.Data.EntityState.Deleted; // db.SaveChanges(); //} //else //{ // Response.Write("要删除的数据不存在!!"); //} UserInfo userInfo = new UserInfo() { ID = 344 }; //db.UserInfo.Remove(userInfo); db.Entry <UserInfo>(userInfo).State = System.Data.EntityState.Deleted; db.SaveChanges(); }
protected void Button4_Click(object sender, EventArgs e) { EFFristModelEntities db = new EFFristModelEntities(); var userInfoList = from u in db.UserInfo where u.ID == 343 select u; var userInfo = userInfoList.FirstOrDefault(); userInfo.UserPass = "******"; db.Entry <UserInfo>(userInfo).State = System.Data.EntityState.Modified; db.SaveChanges(); }