唯一ID最后为空 [英] unique id last empty
本文介绍了唯一ID最后为空的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我用数据库中最后一个数据的调用创建了一个唯一的ID.如果数据最后为空怎么办?
I have created a unique id with the calling of the last data in the database. what if the data last empty?
public static void NewDemand(FilterDemand newDemandData)
{
using (WMS.DAL.WarehouseLinqDataContext dc = new WMS.DAL.WarehouseLinqDataContext())
{
WMS.DAL.Demand Demand = new WMS.DAL.Demand();
DemandData DemandD = new DemandData();
List<DemandData> listDemand = new List<DemandData>();
var log = from de in dc.Demands
group de by new { de.ID_Demand } into result
select new
{
id1 = result.Key.ID_Demand,
id2 = result.Select(i => i.ID_Demand),
y = result.Select(i => i.Year)
};
foreach (var d in log)
{
DemandD.IDDemand = d.id2.Last();
listDemand.Add(DemandD);
}
string al = DemandD.IDDemand;
int x = 0;
string _val1 = al.Substring(1, al.Length - 5);
x = Convert.ToInt32(_val1) + 1;
string ff = "";
ff = "D" + x;
Demand.Month = newDemandData.FilterMonth;
Demand.ID_Demand = "D1";
Demand.GF = (float)newDemandData.FilterGF;
Demand.IND = (float)newDemandData.FilterIndoor;
Demand.Year = (int)newDemandData.FilterYear;
Demand.Total = Demand.GF + Demand.IND;
dc.Demands.InsertOnSubmit(Demand);
dc.SubmitChanges();
}
}
推荐答案
作为最后一步,请检查最后一行是否为空.如果是这样,请删除它.
As a final step, check to see if the last row is empty. If it is, DELETE it.
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