c# 解析 逗号分隔的字符串 转 list

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        //品牌
            if (!string.IsNullOrWhiteSpace(param.BrandIds))
            {
                List<int> ids = param.BrandIds.Split(',').Select(m => Convert.ToInt32(m)).ToList();
                where = where.And(a => ids.Contains(a.BrandID ?? 0));
            }

   if (!string.IsNullOrWhiteSpace(param.Qy))
                {

                    List<int> numbers = param.Qy.Split(new char[]{
','}, StringSplitOptions.RemoveEmptyEntries).Select(Int32.Parse).ToList();
                    foreach (var item in numbers)
                    {
                        Sys_ProductAreasPower s = new Sys_ProductAreasPower();
                        s.ProductID = param.Model.Id;
                        s.AreasPowerID = item;
                        Sys_ProductAreasPower_BLL.InsertNotSubmit(s);
                    }
                    Sys_ProductAreasPower_BLL.SaveChanges();
                }