public virtual bool DeleteRecord(DnsResourceRecordType type, DnsResourceRecordData record)
{
if (_entries.TryGetValue(type, out IReadOnlyList <DnsResourceRecord> existingRecords))
{
if (existingRecords.Count == 1)
{
if (record.Equals(existingRecords[0].RDATA))
{
return(_entries.TryRemove(type, out _));
}
}
else
{
List <DnsResourceRecord> updateRecords = new List <DnsResourceRecord>(existingRecords.Count);
for (int i = 0; i < existingRecords.Count; i++)
{
if (!record.Equals(existingRecords[i].RDATA))
{
updateRecords.Add(existingRecords[i]);
}
}
return(_entries.TryUpdate(type, updateRecords, existingRecords));
}
}
return(false);
}
protected bool DeleteRecord(DnsResourceRecordType type, DnsResourceRecordData rdata, out DnsResourceRecord deletedRecord)
{
if (_entries.TryGetValue(type, out IReadOnlyList <DnsResourceRecord> existingRecords))
{
if (existingRecords.Count == 1)
{
if (rdata.Equals(existingRecords[0].RDATA))
{
if (_entries.TryRemove(type, out IReadOnlyList <DnsResourceRecord> removedRecords))
{
deletedRecord = removedRecords[0];
return(true);
}
}
}
else
{
deletedRecord = null;
List <DnsResourceRecord> updatedRecords = new List <DnsResourceRecord>(existingRecords.Count);
foreach (DnsResourceRecord existingRecord in existingRecords)
{
if ((deletedRecord is null) && rdata.Equals(existingRecord.RDATA))
{
deletedRecord = existingRecord;
}
else
{
updatedRecords.Add(existingRecord);
}
}