Dns.GetHostByName(String) Método

Referencia

Definición

Espacio de nombres:: System.Net

Ensamblado:: System.Net.NameResolution.dll

Ensamblado:: System.dll

Ensamblado:: netstandard.dll

Importante

Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.

Precaución

GetHostByName is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202

Precaución

GetHostByName has been deprecated. Use GetHostEntry instead.

Precaución

GetHostByName is obsoleted for this type, please use GetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202

Precaución

Use GetHostEntry instead

Obtiene la información de DNS para el nombre de host DNS especificado.

public:
 static System::Net::IPHostEntry ^ GetHostByName(System::String ^ hostName);

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

[System.Obsolete("GetHostByName has been deprecated. Use GetHostEntry instead.")]
public static System.Net.IPHostEntry GetHostByName (string hostName);

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

public static System.Net.IPHostEntry GetHostByName (string hostName);

[System.Obsolete("Use GetHostEntry instead")]
public static System.Net.IPHostEntry GetHostByName (string hostName);

[<System.Obsolete("GetHostByName is obsoleted for this type, please use GetHostEntry instead. https://go.microsoft.com/fwlink/?linkid=14202")>]
static member GetHostByName : string -> System.Net.IPHostEntry

[<System.Obsolete("GetHostByName has been deprecated. Use GetHostEntry instead.")>]
static member GetHostByName : string -> System.Net.IPHostEntry

[<System.Obsolete("GetHostByName is obsoleted for this type, please use GetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")>]
static member GetHostByName : string -> System.Net.IPHostEntry

static member GetHostByName : string -> System.Net.IPHostEntry

[<System.Obsolete("Use GetHostEntry instead")>]
static member GetHostByName : string -> System.Net.IPHostEntry

Public Shared Function GetHostByName (hostName As String) As IPHostEntry

Parámetros

hostName: String

Nombre DNS del host.

Devoluciones

IPHostEntry

Objeto IPHostEntry que contiene información de host para la dirección especificada en hostName.

Atributos: ObsoleteAttribute

Excepciones

ArgumentNullException

hostName es null.

ArgumentOutOfRangeException

La longitud de hostName es mayor que 255 caracteres.

SocketException

Se detectó un error al resolver hostName.

Ejemplos

En el ejemplo siguiente se usa el GetHostByName método para obtener la información de DNS del nombre de host DNS especificado.

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.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);
 }

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 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

Comentarios

El GetHostByName método consulta el servidor DNS de Internet para obtener información de host. Si pasa una cadena vacía como nombre de host, este método recupera el nombre de host estándar del equipo local.

Para el acceso asincrónico a la información de DNS, use los BeginGetHostByName métodos y EndGetHostByName .

Si la propiedad se establece trueen , este Ipv6Element.Enabled método no rellena la Aliases propiedad de la IPHostEntry instancia devuelta y siempre estará vacía.

Nota

Este miembro emite información de seguimiento al habilitar el seguimiento de red en la aplicación. Para obtener más información, consulte Seguimiento de red en el .NET Framework.

Se aplica a

Dns.GetHostByName(String) Método

Definición

Parámetros

Devoluciones

Excepciones

Ejemplos

Comentarios

Se aplica a

Recursos adicionales