Dns.Resolve(String) Metodo
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Attenzione
Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202
Attenzione
Resolve has been deprecated. Use GetHostEntry instead.
Attenzione
Resolve is obsoleted for this type, please use GetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202
Risolve un nome host DNS o un indirizzo IP in un'istanza di IPHostEntry.
public:
static System::Net::IPHostEntry ^ Resolve(System::String ^ hostName);[System.Obsolete("Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")]
public static System.Net.IPHostEntry Resolve(string hostName);[System.Obsolete("Resolve has been deprecated. Use GetHostEntry instead.")]
public static System.Net.IPHostEntry Resolve(string hostName);[System.Obsolete("Resolve is obsoleted for this type, please use GetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")]
public static System.Net.IPHostEntry Resolve(string hostName);public static System.Net.IPHostEntry Resolve(string hostName);[<System.Obsolete("Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")>]
static member Resolve : string -> System.Net.IPHostEntry[<System.Obsolete("Resolve has been deprecated. Use GetHostEntry instead.")>]
static member Resolve : string -> System.Net.IPHostEntry[<System.Obsolete("Resolve is obsoleted for this type, please use GetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")>]
static member Resolve : string -> System.Net.IPHostEntrystatic member Resolve : string -> System.Net.IPHostEntryPublic Shared Function Resolve (hostName As String) As IPHostEntry- hostName
- String
Nome host di tipo DNS o indirizzo IP.
Istanza di IPHostEntry contenente informazioni di indirizzo sull'host specificato in hostName.
- Attributi
hostName è null.
La lunghezza del parametro hostName è maggiore di 255 caratteri.
Si è verificato un errore durante la risoluzione del parametro hostName.
Nell'esempio seguente viene usato il Resolve metodo per risolvere un indirizzo IP in un'istanza IPHostEntry di .
try
{
IPHostEntry^ hostInfo = Dns::Resolve( hostString );
// Get the IP address list that resolves to the host names contained in the
// Alias property.
array<IPAddress^>^address = hostInfo->AddressList;
// Get the alias names of the addresses in the IP address list.
array<String^>^alias = hostInfo->Aliases;
Console::WriteLine( "Host name : {0}", hostInfo->HostName );
Console::WriteLine( "\nAliases : " );
for ( int index = 0; index < alias->Length; index++ )
{
Console::WriteLine( alias[ index ] );
}
Console::WriteLine( "\nIP Address list :" );
for ( int index = 0; index < address->Length; index++ )
{
Console::WriteLine( address[ index ] );
}
}
catch ( SocketException^ e )
{
Console::WriteLine( "SocketException caught!!!" );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
catch ( ArgumentNullException^ e )
{
Console::WriteLine( "ArgumentNullException caught!!!" );
Console::WriteLine( "Source : {0}", e->Source );
Console::WriteLine( "Message : {0}", e->Message );
}
catch ( NullReferenceException^ e )
{
Console::WriteLine( "NullReferenceException 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 );
}
try {
IPHostEntry hostInfo = Dns.Resolve(hostString);
// Get the IP address list that resolves to the host names contained in the
// Alias property.
IPAddress[] address = hostInfo.AddressList;
// Get the alias names of the addresses in the IP address list.
String[] alias = hostInfo.Aliases;
Console.WriteLine("Host name : " + hostInfo.HostName);
Console.WriteLine("\nAliases : ");
for(int index=0; index < alias.Length; index++) {
Console.WriteLine(alias[index]);
}
Console.WriteLine("\nIP Address list :");
for(int index=0; index < address.Length; index++) {
Console.WriteLine(address[index]);
}
}
catch(SocketException e)
{
Console.WriteLine("SocketException caught!!!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
}
catch(ArgumentNullException e)
{
Console.WriteLine("ArgumentNullException caught!!!");
Console.WriteLine("Source : " + e.Source);
Console.WriteLine("Message : " + e.Message);
}
catch(NullReferenceException e)
{
Console.WriteLine("NullReferenceException 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);
}
Try
' Call the Resolve method passing a DNS style host name or an IP address in
' dotted-quad notation (for example, "www.contoso.com" or "207.46.131.199") to
' obtain an IPHostEntry instance that contains address information for the
' specified host.
Dim hostInfo As IPHostEntry = Dns.Resolve(hostString)
' Get the IP address list that resolves to the host names contained in the Alias
' property.
Dim address As IPAddress() = hostInfo.AddressList
' Get the alias names of the addresses in the IP address list.
Dim [alias] As [String]() = hostInfo.Aliases
Console.WriteLine(("Host name : " + hostInfo.HostName))
Console.WriteLine(ControlChars.Cr + "Aliases : ")
Dim index As Integer
For index = 0 To [alias].Length - 1
Console.WriteLine([alias](index))
Next index
Console.WriteLine(ControlChars.Cr + "IP Address list :")
For index = 0 To address.Length - 1
Console.WriteLine(address(index))
Next index
Catch e As SocketException
Console.WriteLine("SocketException caught!!!")
Console.WriteLine(("Source : " + e.Source))
Console.WriteLine(("Message : " + e.Message))
Catch e As ArgumentNullException
Console.WriteLine("ArgumentNullException caught!!!")
Console.WriteLine(("Source : " + e.Source))
Console.WriteLine(("Message : " + e.Message))
Catch e As NullReferenceException
Console.WriteLine("NullReferenceException 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
Il Resolve metodo esegue una query su un server DNS per l'indirizzo IP associato a un nome host o a un indirizzo IP.
Quando hostName è un nome host in stile DNS associato a più indirizzi IP, viene restituito solo il primo indirizzo IP che si risolve in tale nome host.
Se la Ipv6Element.Enabled proprietà è impostata su true, la Aliases proprietà dell'istanza IPHostEntry restituita non viene popolata da questo metodo e sarà sempre vuota.
Nota
Questo membro genera informazioni di traccia quando si abilita la traccia di rete nell'applicazione. Per altre informazioni, vedere Traccia di rete in .NET Framework.
| Prodotto | Versioni (Obsoleto) |
|---|---|
| .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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