IPAddressInformation.IsDnsEligible 屬性
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得 Boolean 值，指出網際網路通訊協定 (IP) 位址出現在網域名稱系統 (DNS) 伺服器資料庫中是否有效。
public:
abstract property bool IsDnsEligible { bool get(); };C#
[System.Runtime.Versioning.SupportedOSPlatform("windows")]
public abstract bool IsDnsEligible { get; }C#
public abstract bool IsDnsEligible { get; }[<System.Runtime.Versioning.SupportedOSPlatform("windows")>]
member this.IsDnsEligible : boolmember this.IsDnsEligible : boolPublic MustOverride ReadOnly Property IsDnsEligible As Boolean如果位址可以出現在 DNS 資料庫中則為 true，否則為 false。
- 屬性
下列程式代碼範例會顯示本機電腦上的網路介面的任何廣播位址。
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();
}
}
C#
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
範圍 169.254.0.0 到 169.254.255.255 中的位址不符合 DNS 資格。 這些位址會保留給自動私人IP尋址 (APIPA) 。
| 產品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 |
| .NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 2.0, 2.1 |
