案例程式碼如下：

Model1Container ef = new Model1Container();
//查詢
var liuyan = ef.LiuYan.Where(m => m.BH == "1").FirstOrDefault();

//查詢後更新
liuyan.QQ = "1183816006";
ef.SaveChanges();

//插入
var liy = new LiuYan();
ef.LiuYan.Add(liy);
ef.SaveChanges();

//無查詢直接附加全欄位更新
ef.LiuYan.Attach(liy);
ef.SaveChanges();

//按需更新指定欄位
var liuyanupdate= ef.Entry<LiuYan>(liy);
liuyanupdate.State = EntityState.Unchanged;
liuyanupdate.Property("Bh").IsModified = true;
liuyanupdate.Property("qq").IsModified = true;
ef.SaveChanges();

//無查詢直接刪除資料
liuyanupdate.State = EntityState.Deleted;
ef.SaveChanges();