无法从表格中删除行

Question

I'm trying to delete a row from the table,

My code :

var strUsername = GridMain.SelectedRows[0].Cells[0].Value.ToString().Trim();
Users selectedUser = _db.Users.First(usr => usr.UserName == strUsername);

_db.DeleteObject(selectedUser);
_db.SaveChanges();

LoadGrid(PresentationMode.Users);

My code is working properly

But for only one row of database, an error occurs on SaveChanges()

Error Message :

An error occurred while updating the entries. See the InnerException for details

Row which the error occurs on that :

Inner Exception:

The DELETE statement conflicted with the REFERENCE constraint "FK_UserReport_Users". The conflict occurred in database "Reporter", table "dbo.UsersReports", column 'UserName'.

Answer 1

This Row is available/referenced in UserReport table. So you can't delete it unless you have enabled cascaded delete option. or else delete the row in UserReport and try delete again.

Answer 2

用户报表中存在引用。因此您无法删除父表值。.首先，删除父子关系或使用级联删除选项