public static IAsyncResult BeginResolve
(String hostName, AsyncCallback requestedCallback,
Object stateObject)
{
// TODO
DnsAsyncResult result = new DnsAsyncResult(requestedCallback,
stateObject, DnsOperation.Resolve);
result.BeginInvoke(hostName);
return((IAsyncResult)(result));
}
static void OnCompleted(object sender, SimpleResolverEventArgs e)
{
DnsAsyncResult ares = (DnsAsyncResult)e.UserToken;
IPHostEntry entry = e.HostEntry;
if (entry == null || e.ResolverError != 0)
{
ares.SetCompleted(false, new Exception("Error: " + e.ResolverError));
return;
}
ares.SetCompleted(false, entry);
}
static IAsyncResult BeginAsyncCallAddresses(string host, AsyncCallback callback, object state)
{
SimpleResolverEventArgs e = new SimpleResolverEventArgs();
e.Completed += OnCompleted;
e.HostName = host;
DnsAsyncResult ares = new DnsAsyncResult(callback, state);
e.UserToken = ares;
if (resolver.GetHostAddressesAsync(e) == false)
{
ares.SetCompleted(true, e.HostEntry); // Completed synchronously
}
return(ares);
}
static IPHostEntry EndAsyncCall(DnsAsyncResult ares)
{
if (ares == null)
{
throw new ArgumentException("Invalid asyncResult");
}
if (!ares.IsCompleted)
{
ares.AsyncWaitHandle.WaitOne();
}
if (ares.Exception != null)
{
throw ares.Exception;
}
IPHostEntry entry = ares.HostEntry;
if (entry == null || entry.AddressList == null || entry.AddressList.Length == 0)
{
Error_11001(entry.HostName);
}
return(entry);
}
static IAsyncResult BeginAsyncCall (string host, AsyncCallback callback, object state)
{
SimpleResolverEventArgs e = new SimpleResolverEventArgs ();
e.Completed += OnCompleted;
e.HostName = host;
DnsAsyncResult ares = new DnsAsyncResult (callback, state);
e.UserToken = ares;
if (resolver.GetHostEntryAsync (e) == false)
ares.SetCompleted (true, e.HostEntry); // Completed synchronously
return ares;
}
static IPHostEntry EndAsyncCall (DnsAsyncResult ares)
{
if (ares == null)
throw new ArgumentException ("Invalid asyncResult");
if (!ares.IsCompleted)
ares.AsyncWaitHandle.WaitOne ();
if (ares.Exception != null)
throw ares.Exception;
IPHostEntry entry = ares.HostEntry;
if (entry == null || entry.AddressList == null || entry.AddressList.Length == 0)
throw new SocketException(11001);
return entry;
}
public static IAsyncResult BeginResolve
(String hostName, AsyncCallback requestedCallback,
Object stateObject)
{
// TODO
DnsAsyncResult result=new DnsAsyncResult(requestedCallback,
stateObject,DnsOperation.Resolve);
result.BeginInvoke(hostName);
return (IAsyncResult) (result);
}
static void CB(object _this)
{
DnsAsyncResult ares = (DnsAsyncResult)_this;
ares.callback(ares);
}
