IPAddressInformation.IsDnsEligible Propiedad

Definición

Espacio de nombres:

System.Net.NetworkInformation

Ensamblado:

System.Net.NetworkInformation.dll

Obtiene un valor Boolean que indica si la dirección del protocolo Internet (IP) es válida para aparecer en una base de datos de servidor del Sistema de nombres de dominio (DNS).

public:
 abstract property bool IsDnsEligible { bool get(); };

[System.Runtime.Versioning.SupportedOSPlatform("windows")]
public abstract bool IsDnsEligible { get; }

[<System.Runtime.Versioning.SupportedOSPlatform("windows")>]
member this.IsDnsEligible : bool

Public MustOverride ReadOnly Property IsDnsEligible As Boolean

Valor de propiedad

Boolean

true si la dirección puede aparecer en una base de datos DNS; en caso contrario, false.

Atributos

SupportedOSPlatformAttribute

Ejemplos

En el ejemplo de código siguiente se muestran las direcciones de difusión de las interfaces de red en el equipo local.

void DisplayAnycastAddresses()
{
    int count = 0;
            
    Console::WriteLine( "Anycast Addresses" );
    array<NetworkInterface^>^adapters = NetworkInterface::GetAllNetworkInterfaces();
    System::Collections::IEnumerator^ myEnum13 = adapters->GetEnumerator();
    while ( myEnum13->MoveNext() )
    {
        NetworkInterface ^ adapter = safe_cast<NetworkInterface ^>(myEnum13->Current);
        IPInterfaceProperties ^ adapterProperties = adapter->GetIPProperties();
        IPAddressInformationCollection ^ anyCast = adapterProperties->AnycastAddresses;
        if ( anyCast->Count > 0 )
        {
            Console::WriteLine( adapter->Description );
            System::Collections::IEnumerator^ myEnum14 = anyCast->GetEnumerator();
            while ( myEnum14->MoveNext() )
            {
                IPAddressInformation ^ any = safe_cast<IPAddressInformation ^>(myEnum14->Current);
                Console::WriteLine( "  Anycast Address .......................... : {0} {1} {2}", 
                    any->Address, any->IsTransient ? "Transient" : "", 
                    any->IsDnsEligible ? "DNS Eligible" : "" );
                count++;
            } 
            Console::WriteLine();
        }
    }
    if (count == 0)
    {
        Console::WriteLine("  No anycast addresses were found.");
        Console::WriteLine();
    }
}

public static void DisplayAnycastAddresses()
{
    int count = 0;

    Console.WriteLine("Anycast Addresses");
    NetworkInterface[] adapters  = NetworkInterface.GetAllNetworkInterfaces();
    foreach (NetworkInterface adapter in adapters)
    {
        IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
        IPAddressInformationCollection anyCast = adapterProperties.AnycastAddresses;
        if (anyCast.Count >0)
        {

            Console.WriteLine(adapter.Description);
            foreach (IPAddressInformation any in anyCast)
            {
                Console.WriteLine("  Anycast Address .......................... : {0} {1} {2}",
                    any.Address,
                    any.IsTransient ? "Transient" : "",
                    any.IsDnsEligible ? "DNS Eligible" : ""
                );
                count++;
            }
            Console.WriteLine();
        }
    }
    if (count == 0)
    {
        Console.WriteLine("  No anycast addressses were found.");
        Console.WriteLine();
    }
}

Public Shared Sub DisplayAnycastAddresses() 
    Dim count as Integer = 0
    
    Console.WriteLine("Anycast Addresses")
    Dim adapters As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
    Dim adapter As NetworkInterface
    For Each adapter In  adapters
        Dim adapterProperties As IPInterfaceProperties = adapter.GetIPProperties()
        Dim anyCast As IPAddressInformationCollection = adapterProperties.AnycastAddresses
        If anyCast.Count > 0 Then
            Console.WriteLine(adapter.Description)
            Dim any As IPAddressInformation
            For Each any In  anyCast
                Console.WriteLine("  Anycast Address .......................... : {0} {1} {2}", any.Address, IIf(any.IsTransient, "Transient", ""), IIf(any.IsDnsEligible, "DNS Eligible", ""))
            'TODO: For performance reasons this should be changed to nested IF statements
            'TODO: For performance reasons this should be changed to nested IF statements
                count += 1
            Next any
            Console.WriteLine()
        End If
    Next adapter

    if count = 0 then
        Console.WriteLine("  No anycast addresses were found.")
        Console.WriteLine()
    End if
End Sub

Comentarios

Las direcciones del intervalo 169.254.0.0 a 169.254.255.255 no son aptas para DNS. Estas direcciones están reservadas para el direccionamiento IP privado automático (APIPA).