EF的使用

Expression<Func<CustomerType, bool>> expression = c => (c.Id != null);

  var c = from u in ccc
                    where u.Name == editModel.Name
                    select u.Name;
            ccc.Select(u => u.Name == "");
            ccc.Where(u => u.Name == "").Any(u=>u.Name=="");

1，var cumtomerType = dbContext.CustomerTypes.FirstOrDefault(me => me.Id == id);
2，list = dbContext.CustomerTypes.Where(expression).OrderByDescending(c => c.CreateTime).Skip((pageIndex - 1) * pageSize).Take
3，query.Any(,)确定序列是否包含

select挑选列，where用于筛选