public Task <Queue <ThreatChange> > Update()
{
try
{
new WebClient().DownloadFile(XmlUrl, XmlPath);
var changes = new Queue <ThreatChange>();
using (var excel = new ExcelReader(XmlPath))
{
excel.OpenTable(0);
int rowsCount = excel.GetRowsCount();
var allUpdatedID = new List <int>();
Threat databaseThreat, updatedThreat;
for (int i = 2; i < rowsCount; i++)
{
updatedThreat = new Threat()
{
Number = (int)excel.TryRead <double>(i, 0),
Name = excel.TryRead <string>(i, 1),
Discription = excel.TryRead <string>(i, 2),
Source = excel.TryRead <string>(i, 3),
Object = excel.TryRead <string>(i, 4),
IsPrivacyViolation = excel.TryRead <int>(i, 5) == 1,
IsIntegrityViolation = (int)excel.TryRead <double>(i, 6) == 1,
IsAccessibilityViolation = (int)excel.TryRead <double>(i, 7) == 1,
LastUpdateTime = excel.TryRead <DateTime>(i, 9).ToBinary()
};
allUpdatedID.Add(updatedThreat.Number);
databaseThreat = Threats.FirstOrDefault(x => x.Number == updatedThreat.Number);
if (databaseThreat != null)
{
if (databaseThreat.LastUpdateTime == updatedThreat.LastUpdateTime)
{
continue;
}
else
{
changes.Enqueue(new ThreatChange(databaseThreat.Clone(), updatedThreat));
updatedThreat.ID = databaseThreat.ID;
Entry(databaseThreat).CurrentValues.SetValues(updatedThreat);
continue;
}
}
else
{
changes.Enqueue(new ThreatChange(null, updatedThreat));
Threats.Add(updatedThreat);
continue;
}
}
foreach (var item in Threats.Where(x => !allUpdatedID.Contains(x.Number)))
{
Entry(item).State = EntityState.Deleted;
changes.Enqueue(new ThreatChange(item, null));
}
}
SaveChanges();
File.Delete(XmlPath);
return(Task.FromResult(changes));
}
catch (Exception e)
{
return(Task.FromException <Queue <ThreatChange> >(e));
}
}