如何使用数据集算术计算占位符

Question

我需要将x值与占位符进行比较

请帮助我完成您的输入

x是1500或2100之类的数字。

函数将是一个存储的评估，如x＆gt; 1400和x＆lt; 1600

当我使用关系时，我遇到错误

   var diff = (lastScannedDate - DateTime.UtcNow).Days;
   var deviceStatus = JsonConvert.DeserializeObject<Dictionary<string, string>>(_paasConfigurationManager.GetConfiguration("DeviceStatus").ToString());

   foreach (var key in deviceStatus.Keys)
   {
       foreach (var value in deviceStatus.Values)
       {
           function = relation[0].Replace("and","&&").Replace("x",x);

           DataTable f_dt = new DataTable();
           var f_var = f_dt.Compute(function,"");

           if (bool.Parse(f_var.ToString()) { do stuff  }
       }
   }