IPAddress.IsLoopback(IPAddress) 메서드

정의

지정된 IP 주소가 루프백 주소인지 여부를 나타냅니다.Indicates whether the specified IP address is the loopback address.

public:
 static bool IsLoopback(System::Net::IPAddress ^ address);
public static bool IsLoopback (System.Net.IPAddress address);
static member IsLoopback : System.Net.IPAddress -> bool
Public Shared Function IsLoopback (address As IPAddress) As Boolean

매개 변수

address
IPAddress

IP 주소입니다.An IP address.

반환

address가 루프백 주소이면 true이고, 그렇지 않으면 false입니다.true if address is the loopback address; otherwise, false.

예제

다음 코드 예제에서는 IsLoopback 메서드를 사용 하 여 지정 된 주소가 루프백 주소 인지 여부를 확인 합니다.The following code example uses the IsLoopback method to determine whether the specified address is a loopback address.

#using <System.dll>

using namespace System;
using namespace System::Net;
using namespace System::Net::Sockets;

// This method calls the IPAddress::Parse method to check if the
// passed ipAddress parameter is in the correct format.
// Then it checks whether it represents a loopback address.
// Finally, it displays the results.
void parse( String^ ipAddress )
{
   String^ loopBack = " is not a loopback address.";
   try
   {
      
      // Perform syntax check by parsing the address string entered by the user.
      IPAddress^ address = IPAddress::Parse( ipAddress );
      
      // Perform semantic check by verifying that the address is a valid IPv4
      // or IPv6 loopback address.
      if ( IPAddress::IsLoopback( address ) && address->AddressFamily == AddressFamily::InterNetworkV6 )
            loopBack = String::Concat( " is an IPv6 loopback address whose internal format is: ", address, "." );
      else
      if ( IPAddress::IsLoopback( address ) && address->AddressFamily == AddressFamily::InterNetwork )
            loopBack = String::Concat( " is an IPv4 loopback address whose internal format is: ", address, "." );
      
      // Display the results.
      Console::WriteLine( "Your input address: \" {0} \" {1}", ipAddress, loopBack );
   }
   catch ( FormatException^ e ) 
   {
      Console::WriteLine( "FormatException 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 );
   }

}

int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   if ( args->Length == 1 )
   {
      
      // No parameters entered. Display program usage.
      Console::WriteLine( "Please enter an IP address." );
      Console::WriteLine( "Usage:   >ipaddress_isloopback any IPv4 or IPv6 address." );
      Console::WriteLine( "Example: >ipaddress_isloopback 127.0.0.1" );
      Console::WriteLine( "Example: >ipaddress_isloopback 0:0:0:0:0:0:0:1" );
   }
   else
      parse( args[ 1 ] );

   
   // Parse the address string entered by the user.
}


using System;
using System.Net;
using System.Net.Sockets;

class IsLoopbackTest
{

  private static void Main(string[] args) 
  {
    
    if (args.Length == 0)
    {
      // No parameters entered. Display program usage.
      Console.WriteLine("Please enter an IP address.");
      Console.WriteLine("Usage:   >ipaddress_isloopback any IPv4 or IPv6 address.");
      Console.WriteLine("Example: >ipaddress_isloopback 127.0.0.1");
      Console.WriteLine("Example: >ipaddress_isloopback 0:0:0:0:0:0:0:1");
      return;
    }
    else
      // Parse the address string entered by the user.
      parse(args[0]);
   
  }

  // This method calls the IPAddress.Parse method to check if the 
  // passed ipAddress parameter is in the correct format.
  // Then it checks whether it represents a loopback address.
  // Finally, it displays the results.
  private static void parse(string ipAddress)
  {
    string loopBack=" is not a loopback address.";

    try
    {
      // Perform syntax check by parsing the address string entered by the user.
      IPAddress address = IPAddress.Parse(ipAddress);

      // Perform semantic check by verifying that the address is a valid IPv4 
      // or IPv6 loopback address. 
      if(IPAddress.IsLoopback(address)&& address.AddressFamily == AddressFamily.InterNetworkV6)
        loopBack =  " is an IPv6 loopback address " +
                    "whose internal format is: " + address.ToString() + ".";
      else
        if(IPAddress.IsLoopback(address) && address.AddressFamily == AddressFamily.InterNetwork)
          loopBack = " is an IPv4 loopback address " +
                     "whose internal format is: " + address.ToString() + ".";

      // Display the results.
      Console.WriteLine("Your input address: " + "\"" + ipAddress + "\"" + loopBack);
    }

    catch(FormatException e)
    {
      Console.WriteLine("FormatException 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);
    }

   }
}
Imports System.Net
Imports System.Net.Sockets

 _

Class IsLoopbackTest
   
   'Entry point which delegates to C-style main Private Function
   Public Overloads Shared Sub Main()
      Main(System.Environment.GetCommandLineArgs())
   End Sub
   
   
   Overloads Private Shared Sub Main(args() As String)
      
       If args.Length = 1 Then
         ' No parameters entered. Display program usage.
         Console.WriteLine("Please enter an IP address.")
         Console.WriteLine("Usage:   >ipaddress_isloopback any IPv4 or IPv6 address.")
         Console.WriteLine("Example: >ipaddress_isloopback 127.0.0.1")
         Console.WriteLine("Example: >ipaddress_isloopback 0:0:0:0:0:0:0:1")
         Return
      ' Parse the address string entered by the user.
      Else
        parse(args(1))
      End If 
   End Sub
   
   
   ' This method calls the IPAddress.Parse method to check whether the 
   ' passed ipAddress parameter is in the correct format.
   ' Then it checks whether it represents a loopback address.
   ' Finally, it displays the results.
   Private Shared Sub parse(ipAdd As String)
      Dim loopBack As String = " is not a loopback address."
      
      Try
         ' Perform syntax check by parsing the address string entered by the user.
         Dim address As IPAddress = IPAddress.Parse(ipAdd)
         
         ' Perform semantic check by verifying that the address is a valid IPv4 
         ' or IPv6 loopback address. 
         If IPAddress.IsLoopback(address) And address.AddressFamily = AddressFamily.InterNetworkV6 Then
            loopBack = " is an IPv6 loopback address " + "whose internal format is: " + address.ToString() + "."
         Else
            If IPAddress.IsLoopback(address) And address.AddressFamily = AddressFamily.InterNetwork Then
               loopBack = " is an IPv4 loopback address " + "whose internal format is: " + address.ToString() + "."
            End If
         End If 
         ' Display the results.
         Console.WriteLine(("Your input address: " + """" + ipAdd + """" + loopBack))
      
      Catch e As FormatException
         Console.WriteLine("FormatException 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
   End Sub
End Class

설명

IsLoopback 메서드는 addressLoopback와 비교 하 고 두 IP 주소가 동일한 경우 true을 반환 합니다.The IsLoopback method compares address to Loopback and returns true if the two IP addresses are the same.

I p v 4의 경우 IsLoopback 메서드는 Loopback (127.0.0.1) 뿐만 아니라 127 (X, Y, 0-255 Z) 형식의 IP 주소에 대 한 true 반환 합니다.In the case of IPv4, that the IsLoopback method returns true for any IP address of the form 127.X.Y.Z (where X, Y, and Z are in the range 0-255), not just Loopback (127.0.0.1).

적용 대상