IPAddressInformation.IsDnsEligible Свойство

Определение

Пространство имен:

System.Net.NetworkInformation

Сборка:

System.Net.NetworkInformation.dll

Возвращает значение типа Boolean, указывающее, является ли IP-адрес допустимым, чтобы попасть в базу данных DNS-сервера.

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

Значение свойства

Boolean

Значение true, если адрес может попасть в базу данных DNS; в противном случае — false.

Атрибуты

SupportedOSPlatformAttribute

Примеры

В следующем примере кода отображаются адреса anycast для сетевых интерфейсов на локальном компьютере.

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

Комментарии

Адреса в диапазоне от 169.254.0.0 до 169.254.255.255 не допускаются к DNS. Эти адреса зарезервированы для автоматической адресации частных IP-адресов (APIPA).