Dns.EndResolve(IAsyncResult) Méthode
Important
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Attention
EndResolve is obsoleted for this type, please use EndGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202
Attention
EndResolve has been deprecated. Use EndGetHostEntry instead.
Attention
EndResolve is obsoleted for this type, please use EndGetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202
Achève une demande asynchrone d'informations DNS.
public:
static System::Net::IPHostEntry ^ EndResolve(IAsyncResult ^ asyncResult);
[System.Obsolete("EndResolve is obsoleted for this type, please use EndGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
public static System.Net.IPHostEntry EndResolve (IAsyncResult asyncResult);
[System.Obsolete("EndResolve has been deprecated. Use EndGetHostEntry instead.")]
public static System.Net.IPHostEntry EndResolve (IAsyncResult asyncResult);
[System.Obsolete("EndResolve is obsoleted for this type, please use EndGetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")]
public static System.Net.IPHostEntry EndResolve (IAsyncResult asyncResult);
public static System.Net.IPHostEntry EndResolve (IAsyncResult asyncResult);
[<System.Obsolete("EndResolve is obsoleted for this type, please use EndGetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")>]
static member EndResolve : IAsyncResult -> System.Net.IPHostEntry
[<System.Obsolete("EndResolve has been deprecated. Use EndGetHostEntry instead.")>]
static member EndResolve : IAsyncResult -> System.Net.IPHostEntry
[<System.Obsolete("EndResolve is obsoleted for this type, please use EndGetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")>]
static member EndResolve : IAsyncResult -> System.Net.IPHostEntry
static member EndResolve : IAsyncResult -> System.Net.IPHostEntry
Public Shared Function EndResolve (asyncResult As IAsyncResult) As IPHostEntry
- asyncResult
- IAsyncResult
Instance de IAsyncResult qui est retournée par un appel à la méthode BeginResolve(String, AsyncCallback, Object).
Objet IPHostEntry contenant les informations DNS relatives à un hôte.
- Attributs
asyncResult
a la valeur null
.
L’exemple suivant met fin à une demande asynchrone d’informations sur l’hôte DNS.
public ref class DnsBeginGetHostByName
{
public:
static System::Threading::ManualResetEvent^ allDone = nullptr;
ref class RequestState
{
public:
IPHostEntry^ host;
RequestState()
{
host = nullptr;
}
};
static void RespCallback( IAsyncResult^ ar )
{
try
{
// Convert the IAsyncResult* Object* to a RequestState Object*.
RequestState^ tempRequestState = dynamic_cast<RequestState^>(ar->AsyncState);
// End the asynchronous request.
tempRequestState->host = Dns::EndResolve( ar );
allDone->Set();
}
catch ( ArgumentNullException^ e )
{
Console::WriteLine( "ArgumentNullException caught!!!" );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception caught!!!" );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
}
};
int main()
{
DnsBeginGetHostByName::allDone = gcnew ManualResetEvent( false );
// Create an instance of the RequestState class.
DnsBeginGetHostByName::RequestState^ myRequestState =
gcnew DnsBeginGetHostByName::RequestState;
// Begin an asynchronous request for information like host name, IP addresses, or
// aliases for specified the specified URI.
IAsyncResult^ asyncResult = Dns::BeginResolve( "www.contoso.com",
gcnew AsyncCallback( DnsBeginGetHostByName::RespCallback ), myRequestState );
// Wait until asynchronous call completes.
DnsBeginGetHostByName::allDone->WaitOne();
Console::WriteLine( "Host name : {0}", myRequestState->host->HostName );
Console::WriteLine( "\nIP address list : " );
for ( int index = 0; index < myRequestState->host->AddressList->Length; index++ )
Console::WriteLine( myRequestState->host->AddressList[ index ] );
Console::WriteLine( "\nAliases : " );
for ( int index = 0; index < myRequestState->host->Aliases->Length; index++ )
Console::WriteLine( myRequestState->host->Aliases[ index ] );
}
class DnsBeginGetHostByName
{
public static System.Threading.ManualResetEvent allDone = null;
class RequestState
{
public IPHostEntry host;
public RequestState()
{
host = null;
}
}
public static void Main()
{
allDone = new ManualResetEvent(false);
// Create an instance of the RequestState class.
RequestState myRequestState = new RequestState();
// Begin an asynchronous request for information like host name, IP addresses, or
// aliases for specified the specified URI.
IAsyncResult asyncResult = Dns.BeginResolve("www.contoso.com", new AsyncCallback(RespCallback), myRequestState );
// Wait until asynchronous call completes.
allDone.WaitOne();
Console.WriteLine("Host name : " + myRequestState.host.HostName);
Console.WriteLine("\nIP address list : ");
for(int index=0; index < myRequestState.host.AddressList.Length; index++)
{
Console.WriteLine(myRequestState.host.AddressList[index]);
}
Console.WriteLine("\nAliases : ");
for(int index=0; index < myRequestState.host.Aliases.Length; index++)
{
Console.WriteLine(myRequestState.host.Aliases[index]);
}
}
private static void RespCallback(IAsyncResult ar)
{
try
{
// Convert the IAsyncResult object to a RequestState object.
RequestState tempRequestState = (RequestState)ar.AsyncState;
// End the asynchronous request.
tempRequestState.host = Dns.EndResolve(ar);
allDone.Set();
}
catch(ArgumentNullException e)
{
Console.WriteLine("ArgumentNullException caught!!!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
}
catch(Exception e)
{
Console.WriteLine("Exception caught!!!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
}
}
}
Class DnsBeginGetHostByName
Class RequestState
Public host As IPHostEntry
Public Sub New()
host = Nothing
End Sub
End Class
Public Shared Sub Main()
Try
' Create an instance of the RequestState class.
Dim myRequestState As New RequestState()
' Begin an asynchronous request for information such as the host name, IP addresses,
' or aliases for the specified URI.
Dim asyncResult As IAsyncResult = CType(Dns.BeginResolve("www.contoso.com", AddressOf RespCallback, myRequestState),IAsyncResult)
' Wait until asynchronous call completes.
While asyncResult.IsCompleted <> True
End While
Console.WriteLine(("Host name : " + myRequestState.host.HostName))
Console.WriteLine(ControlChars.Cr + "IP address list : ")
Dim index As Integer
For index = 0 To myRequestState.host.AddressList.Length - 1
Console.WriteLine(myRequestState.host.AddressList(index))
Next index
Console.WriteLine(ControlChars.Cr + "Aliases : ")
For index = 0 To myRequestState.host.Aliases.Length - 1
Console.WriteLine(myRequestState.host.Aliases(index))
Next index
catch e as Exception
Console.WriteLine("Exception caught!!!")
Console.WriteLine(("Source : " + e.Source))
Console.WriteLine(("Message : " + e.Message))
End Try
End Sub
Private Shared Sub RespCallback(ar As IAsyncResult)
Try
' Convert the IAsyncResult object to a RequestState object.
Dim tempRequestState As RequestState = CType(ar.AsyncState, RequestState)
' End the asynchronous request.
tempRequestState.host = Dns.EndResolve(ar)
Catch e As ArgumentNullException
Console.WriteLine("ArgumentNullException caught!!!")
Console.WriteLine(("Source : " + e.Source))
Console.WriteLine(("Message : " + e.Message))
Catch e As Exception
Console.WriteLine("Exception caught!!!")
Console.WriteLine(("Source : " + e.Source))
Console.WriteLine(("Message : " + e.Message))
End Try
End Sub
Cette méthode se bloque jusqu’à ce que l’opération soit terminée.
Si a la Ipv6Element.Enabled valeur , la Aliases propriété de l’instance IPHostEntry retournée n’est pas remplie par cette méthode et true
sera toujours vide.
Pour effectuer cette opération de manière synchrone, utilisez la Resolve méthode .
Notes
Ce membre émet des informations de trace lorsque vous activez le suivi réseau dans votre application. Pour plus d’informations, consultez Suivi réseau dans le .NET Framework.
Produit | Versions (Obsolète) |
---|---|
.NET | (Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9) |
.NET Framework | 1.1 (2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1) |
.NET Standard | (2.0, 2.1) |
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