DuplicateAddressDetectionState 列舉
定義
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。
指定 IP 位址的目前狀態。
public enum class DuplicateAddressDetectionStatepublic enum DuplicateAddressDetectionStatetype DuplicateAddressDetectionState = Public Enum DuplicateAddressDetectionState- 繼承
欄位
| Deprecated | 3 | 此位址是有效的，但其使用存留期 (Lease Lifetime) 已將要結束，所以不應該由應用程式使用。 |
| Duplicate | 2 | 此位址不是唯一的。 這個位址不應指派給網路介面。 |
| Invalid | 0 | 此位址無效。 無效的位址已過期且不再指派給介面，所以應用程式不應傳送資料封包到該位址。 |
| Preferred | 4 | 此位址有效且其使用不受限制。 |
| Tentative | 1 | 針對位址進行的重複位址偵測程序評估尚未成功完成。 應用程式不應使用該位址，因為它尚未生效且傳送給它的封包會遭捨棄。 |
範例
下列程式代碼範例會決定單播地址資訊。
void DisplayUnicastAddresses()
{
Console::WriteLine( "Unicast Addresses" );
array<NetworkInterface^>^adapters = NetworkInterface::GetAllNetworkInterfaces();
System::Collections::IEnumerator^ myEnum17 = adapters->GetEnumerator();
while ( myEnum17->MoveNext() )
{
NetworkInterface ^ adapter = safe_cast<NetworkInterface ^>(myEnum17->Current);
IPInterfaceProperties ^ adapterProperties = adapter->GetIPProperties();
UnicastIPAddressInformationCollection ^ uniCast = adapterProperties->UnicastAddresses;
if ( uniCast->Count > 0 )
{
Console::WriteLine( adapter->Description );
String^ lifeTimeFormat = "dddd, MMMM dd, yyyy hh:mm:ss tt";
System::Collections::IEnumerator^ myEnum18 = uniCast->GetEnumerator();
while ( myEnum18->MoveNext() )
{
UnicastIPAddressInformation ^ uni = safe_cast<UnicastIPAddressInformation ^>(myEnum18->Current);
DateTime when;
Console::WriteLine( " Unicast Address ......................... : {0}",
uni->Address );
Console::WriteLine( " Prefix Origin ........................ : {0}",
uni->PrefixOrigin );
Console::WriteLine( " Suffix Origin ........................ : {0}",
uni->SuffixOrigin );
Console::WriteLine( " Duplicate Address Detection .......... : {0}",
uni->DuplicateAddressDetectionState );
// Format the lifetimes as Sunday, February 16, 2003 11:33:44 PM
// if en-us is the current culture.
// Calculate the date and time at the end of the lifetimes.
when = DateTime::UtcNow + TimeSpan::FromSeconds( (double)uni->AddressValidLifetime );
when = when.ToLocalTime();
Console::WriteLine( " Valid Life Time ...................... : {0}",
when.ToString( lifeTimeFormat, System::Globalization::CultureInfo::CurrentCulture ) );
when = DateTime::UtcNow + TimeSpan::FromSeconds( (double)uni->AddressPreferredLifetime );
when = when.ToLocalTime();
Console::WriteLine( " Preferred life time .................. : {0}",
when.ToString( lifeTimeFormat, System::Globalization::CultureInfo::CurrentCulture ) );
when = DateTime::UtcNow + TimeSpan::FromSeconds( (double)uni->DhcpLeaseLifetime );
when = when.ToLocalTime();
Console::WriteLine( " DHCP Leased Life Time ................ : {0}",
when.ToString( lifeTimeFormat, System::Globalization::CultureInfo::CurrentCulture ) );
}
Console::WriteLine();
}
}
}
public static void DisplayUnicastAddresses()
{
Console.WriteLine("Unicast Addresses");
NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in adapters)
{
IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
UnicastIPAddressInformationCollection uniCast = adapterProperties.UnicastAddresses;
if (uniCast.Count >0)
{
Console.WriteLine(adapter.Description);
string lifeTimeFormat = "dddd, MMMM dd, yyyy hh:mm:ss tt";
foreach (UnicastIPAddressInformation uni in uniCast)
{
DateTime when;
Console.WriteLine(" Unicast Address ......................... : {0}", uni.Address);
Console.WriteLine(" Prefix Origin ........................ : {0}", uni.PrefixOrigin);
Console.WriteLine(" Suffix Origin ........................ : {0}", uni.SuffixOrigin);
Console.WriteLine(" Duplicate Address Detection .......... : {0}",
uni.DuplicateAddressDetectionState);
// Format the lifetimes as Sunday, February 16, 2003 11:33:44 PM
// if en-us is the current culture.
// Calculate the date and time at the end of the lifetimes.
when = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressValidLifetime);
when = when.ToLocalTime();
Console.WriteLine(" Valid Life Time ...................... : {0}",
when.ToString(lifeTimeFormat,System.Globalization.CultureInfo.CurrentCulture)
);
when = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressPreferredLifetime);
when = when.ToLocalTime();
Console.WriteLine(" Preferred life time .................. : {0}",
when.ToString(lifeTimeFormat,System.Globalization.CultureInfo.CurrentCulture)
);
when = DateTime.UtcNow + TimeSpan.FromSeconds(uni.DhcpLeaseLifetime);
when = when.ToLocalTime();
Console.WriteLine(" DHCP Leased Life Time ................ : {0}",
when.ToString(lifeTimeFormat,System.Globalization.CultureInfo.CurrentCulture)
);
}
Console.WriteLine();
}
}
}
Public Shared Sub DisplayUnicastAddresses()
Console.WriteLine("Unicast Addresses")
Dim adapters As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
Dim adapter As NetworkInterface
For Each adapter In adapters
Dim adapterProperties As IPInterfaceProperties = adapter.GetIPProperties()
Dim uniCast As UnicastIPAddressInformationCollection = adapterProperties.UnicastAddresses
If uniCast.Count > 0 Then
Console.WriteLine(adapter.Description)
Dim lifeTimeFormat As String = "dddd, MMMM dd, yyyy hh:mm:ss tt"
Dim uni As UnicastIPAddressInformation
For Each uni In uniCast
Dim [when] As DateTime
Console.WriteLine(" Unicast Address ......................... : {0}", uni.Address)
Console.WriteLine(" Prefix Origin ........................ : {0}", uni.PrefixOrigin)
Console.WriteLine(" Suffix Origin ........................ : {0}", uni.SuffixOrigin)
Console.WriteLine(" Duplicate Address Detection .......... : {0}", uni.DuplicateAddressDetectionState)
' Format the lifetimes as Sunday, February 16, 2003 11:33:44 PM
' if en-us is the current culture.
' Calculate the date and time at the end of the lifetimes.
[when] = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressValidLifetime)
[when] = [when].ToLocalTime()
Console.WriteLine(" Valid Life Time ...................... : {0}", [when].ToString(lifeTimeFormat, System.Globalization.CultureInfo.CurrentCulture))
[when] = DateTime.UtcNow + TimeSpan.FromSeconds(uni.AddressPreferredLifetime)
[when] = [when].ToLocalTime()
Console.WriteLine(" Preferred life time .................. : {0}", [when].ToString(lifeTimeFormat, System.Globalization.CultureInfo.CurrentCulture))
[when] = DateTime.UtcNow + TimeSpan.FromSeconds(uni.DhcpLeaseLifetime)
[when] = [when].ToLocalTime()
Console.WriteLine(" DHCP Leased Life Time ................ : {0}", [when].ToString(lifeTimeFormat, System.Globalization.CultureInfo.CurrentCulture))
Next uni
Console.WriteLine()
End If
Next adapter
End Sub
備註
為了協助確保網路上的所有介面都有唯一的位址，介面主機負責在單播位址上執行「重複位址偵測」演算法。 此演算法的目的是要嘗試防止網路上的非唯一位址。 此程式定義於IETF RFC 1971 中。
和 MulticastIPAddressInformation 類別會使用此UnicastIPAddressInformation列舉。 當您擷取 物件的單播地址資訊時，會傳回這個類別的 NetworkInterface 實例。
