C# 将数组拼接为字符串 string.Join 的使用

 

• param.ids为String[] 数组

 StringBuilder sql = new StringBuilder();
  sql.Append($" select * from  school_relation   where id in ('{string.Join("','", param.ids)}')  ;");

•  过滤条件为集合也可以这样写

       public List<string> GetCertArray(string[] certificate_nums, Guid id)
        {
            dynamic date_sql_parames = new System.Dynamic.ExpandoObject();
            date_sql_parames.Id = id;
            date_sql_parames.certificateNums = certificate_nums.ToList();
            var date_sql_str = $"select  Certificate_Num  from  TabA where id=@Id  and certificate_num in @certificateNums  ;";
            var list = _partnersDal.Query<string>(date_sql_str, date_sql_parames);
            return list;

        }