可能重复:
无法使用已在使用的键添加实体 (LINQ)
我在这个问题上搜索了很多,发现很多人都面临同样的问题。但可以通过它。发布了许多解决方案,但没有收获。
我编写了一个LINQ查询,它检索大约 38 条记录,并使用foreach循环根据代码将这些记录插入到其他表中。
var Results = (from p in (from d in compact.CURRENT_STATUS
where QtrEndDate >= d.ValidStartDate && QtrEndDate <= d.ValidDueDate && d.LocationCode == EmployeeLocation && d.DeptCode == selecteddept
select new
{
loccode = d.LocationCode,
taskcode = d.TaskCode,
deptcode = d.DeptCode,
flag = d.Flag,
startdate = d.ValidStartDate,
duedate = d.ValidDueDate,
remarks = d.Remarks,
content = d.UploadDocContent,
title = d.UploadDocTitle,
type = d.UploadDocType
}).Union(from i in compact.HISTORY_STATUS
where QtrEndDate >= i.ValidStartDate && QtrEndDate <= i.ValidEndDate && i.LocationCode == EmployeeLocation && i.DeptCode == selecteddept
select new
{
loccode = i.LocationCode,
taskcode = i.TaskCode,
deptcode = i.DeptCode,
flag = i.Flag,
startdate = i.ValidStartDate,
duedate = i.ValidEndDate.Date,
remarks = i.Remarks,
content = i.UploadDocContent,
title = i.UploadDocTitle,
type = i.UploadDocType
}) select p);
foreach (var item in Results)
{
REPORT_TABLE RT = new REPORT_TABLE();
{
RT.LocationCode = item.loccode;
RT.TaskCode = item.taskcode;
RT.DeptCode = item.deptcode;
RT.Flag = item.flag;
RT.ValidStartDate = item.startdate;
RT.ValidDueDate = item.duedate;
RT.Remarks = item.remarks;
RT.UploadDocContent = item.content;
RT.UploadDocTitle = item.title;
RT.UploadDocType = item.type;
RT.SubmittedBy = (Session["username"]).ToString();
RT.SubmittedByIP = (Session["IP"]).ToString();
RT.SubmittedOn = System.DateTime.Now;
RT.ReportID = RHqueryFind.ReportID;
RT.AsOnDate = QtrEndDate;
}
compact.REPORT_TABLEs.InsertOnSubmit(RT);
compact.SubmitChanges();
};
但我确实收到错误Cannot add an entity with a key that has been in use in the last line ie SubmitChanges。
在其中一个解决方案中,我发现要添加一行代码,RefreshMode
但这无法解决我的问题。