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Dns.GetHostByName-Methode

HINWEIS: Diese Methode ist mittlerweile veraltet.

Ruft die DNS-Informationen für den angegebenen DNS-Hostnamen ab.

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

Syntax

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

returnValue = Dns.GetHostByName(hostName)

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

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

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

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

Parameter

  • hostName
    Der DNS-Name des Hosts.

Rückgabewert

Ein IPHostEntry-Objekt mit Hostinformationen für die in hostName angegebene Adresse.

Ausnahmen

Ausnahmetyp Bedingung

ArgumentNullException

hostName ist NULL (Nothing in Visual Basic).

ArgumentOutOfRangeException

hostName ist länger als 126 Zeichen.

SocketException

Beim Auflösen von hostName ist ein Fehler aufgetreten.

Hinweise

Die GetHostByName-Methode fragt den Internet-DNS-Server nach Hostinformationen ab. Wenn als Hostname eine leere Zeichenfolge übergeben wird, ruft die Methode den Standardhostnamen für den lokalen Computer ab.

Verwenden Sie für den asynchronen Zugriff auf DNS-Informationen die BeginGetHostByName-Methode und die EndGetHostByName-Methode.

Hinweis

Dieser Member gibt Ablaufverfolgungsinformationen aus, wenn Sie die Netzwerkablaufverfolgung in der Anwendung aktivieren. Weitere Informationen finden Sie unter Netzwerkablaufverfolgung.

Beispiel

Im folgenden Beispiel wird die GetHostByName-Methode zum Abrufen der DNS-Informationen für den angegebenen DNS-Hostnamen verwendet.

Public Sub DisplayHostName(hostName As [String])
    Try
        ' Call the GetHostByName method, passing a DNS style host name(for example,
        ' "www.contoso.com") as an argument to obtain an IPHostEntry instance, that 
        ' contains information for the specified host.
        
        Dim hostInfo As IPHostEntry = Dns.GetHostByName(hostName)
        ' 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 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 Exception
        Console.WriteLine("Exception caught!!!")
        Console.WriteLine(("Source : " + e.Source))
        Console.WriteLine(("Message : " + e.Message))
    End Try

 try 
 {
    IPHostEntry hostInfo = Dns.GetHostByName(hostName);
    // 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(Exception e)
 {
     Console.WriteLine("Exception caught!!!");
     Console.WriteLine("Source : " + e.Source);
     Console.WriteLine("Message : " + e.Message);
 }

try
{
   IPHostEntry^ hostInfo = Dns::GetHostByName( hostName );
   
   // 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 ( Exception^ e ) 
{
   Console::WriteLine( "Exception caught!!!" );
   Console::WriteLine( "Source : {0}", e->Source );
   Console::WriteLine( "Message : {0}", e->Message );
}

try {
    IPHostEntry hostInfo = Dns.GetHostByName(hostName);

    // 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 (System.Exception e) {
    Console.WriteLine("Exception caught!!!");
    Console.WriteLine("Source : " + e.get_Source());
    Console.WriteLine("Message : " + e.get_Message());
}

.NET Framework-Sicherheit

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

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