public bool EndQuery(IAsyncResult ar, out IPAddress[] providerResult)
{
Provider.QueryAsyncResult queryAsyncResult = ar as Provider.QueryAsyncResult;
if (queryAsyncResult != null && queryAsyncResult.IsCompleted)
{
providerResult = queryAsyncResult.ProviderResult;
return(queryAsyncResult.IsMatch);
}
throw new InvalidOperationException();
}
private void DnsQueryCallback(IAsyncResult ar)
{
IPAddress[] array;
DnsStatus dnsStatus = Dns.EndResolveToAddresses(ar, out array);
bool isMatch = false;
if (dnsStatus == DnsStatus.Success)
{
isMatch = this.MatchResult(array);
}
Provider.QueryAsyncResult queryAsyncResult = (Provider.QueryAsyncResult)ar.AsyncState;
queryAsyncResult.QueryCompleted(isMatch, array);
}
public IAsyncResult BeginQuery(IPAddress ipAddress, AsyncCallback asyncCallback, object asyncState)
{
Provider.QueryAsyncResult queryAsyncResult = new Provider.QueryAsyncResult(asyncCallback, asyncState);
queryAsyncResult.SetAsync();
string domainName = string.Format("{0}.{1}", this.ReverseIP(ipAddress), this.provider.LookupDomain);
IAsyncResult asyncResult = this.dns.BeginResolveToAddresses(domainName, AddressFamily.InterNetwork, new AsyncCallback(this.DnsQueryCallback), queryAsyncResult);
if (asyncResult.CompletedSynchronously)
{
queryAsyncResult.ResetAsync();
}
return(queryAsyncResult);
}