Dns.Resolve-Methode

HINWEIS: Diese Methode ist mittlerweile veraltet.

Löst einen DNS-Hostnamen oder eine IP-Adresse in eine IPHostEntry-Instanz auf.

Namespace: System.Net
Assembly: System (in system.dll)

Syntax

'Declaration
<ObsoleteAttribute("Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")> _
Public Shared Function Resolve ( _
    hostName As String _
) As IPHostEntry
'Usage
Dim hostName As String
Dim returnValue As IPHostEntry

returnValue = Dns.Resolve(hostName)

[ObsoleteAttribute("Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")] 
public static IPHostEntry Resolve (
    string hostName
)

[ObsoleteAttribute(L"Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")] 
public:
static IPHostEntry^ Resolve (
    String^ hostName
)

/** @attribute ObsoleteAttribute("Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202") */ 
public static IPHostEntry Resolve (
    String hostName
)

ObsoleteAttribute("Resolve is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202") 
public static function Resolve (
    hostName : String
) : IPHostEntry

Parameter

• hostName
  Ein Hostname im DNS-Format oder eine IP-Adresse.

Rückgabewert

Eine IPHostEntry-Instanz mit Adressinformationen zu dem in hostName angegebenen Host.

Ausnahmen

Hinweise

Die Resolve-Methode fragt einen DNS-Server nach der IP-Adresse ab, die einem Hostnamen oder einer IP-Adresse zugeordnet ist.

Wenn hostName ein DNS-Hostname ist, dem mehrere IP-Adressen zugeordnet sind, wird nur die erste zu diesem Hostnamen aufgelöste IP-Adresse zurückgegeben.

Beispiel

Im folgenden Beispiel wird die Resolve-Methode zum Auflösen einer IP-Adresse in eine IPHostEntry-Instanz verwendet.

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

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
{
   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.get_AddressList();

    // Get the alias names of the addresses in the IP address list.
    String alias[] = hostInfo.get_Aliases();

    Console.WriteLine("Host name : " + hostInfo.get_HostName());
    Console.WriteLine("\nAliases : ");
    for (int index = 0; index < alias.length; index++) {
        Console.WriteLine(alias.get_Item(index));
    }
    Console.WriteLine("\nIP Address list :");
    for (int index = 0; index < address.length; index++) {
        Console.WriteLine(address.get_Item(index));
    }
}
catch (SocketException e) {
    Console.WriteLine("SocketException caught!!!");
    Console.WriteLine("Source : " + e.get_Source());
    Console.WriteLine("Message : " + e.get_Message());
}
catch (ArgumentNullException e) {
    Console.WriteLine("ArgumentNullException caught!!!");
    Console.WriteLine("Source : " + e.get_Source());
    Console.WriteLine("Message : " + e.get_Message());
}
catch (NullReferenceException e) {
    Console.WriteLine("NullReferenceException caught!!!");
    Console.WriteLine("Source : " + e.get_Source());
    Console.WriteLine("Message : " + e.get_Message());
}
catch (System.Exception e) {
    Console.WriteLine("Exception caught!!!");
    Console.WriteLine("Source : " + e.get_Source());
    Console.WriteLine("Message : " + e.get_Message());
}

.NET Framework-Sicherheit

• DnsPermission  für den Zugriff auf DNS-Informationen. Zugeordnete Enumeration: PermissionState.Unrestricted

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 1.0, 1.1
Veraltet (Compilerwarnung) in 2.0

.NET Compact Framework

Unterstützt in: 1.0
Veraltet (Compilerwarnung) in 2.0

Siehe auch

Referenz

Dns-Klasse
Dns-Member
System.Net-Namespace