IPHostEntry.HostName プロパティとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

IPHostEntry.HostName プロパティ

ホストの DNS 名を取得または設定します。

名前空間: System.Net
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Property HostName As
 String

Visual Basic (使用法)

Dim instance As IPHostEntry
Dim value As String

value = instance.HostName

instance.HostName = value

public string HostName { get;
 set; }

C++

public:
property String^ HostName {
    String^ get ();
    void set (String^ value);
}

/** @property */
public String get_HostName ()

/** @property */
public void set_HostName (String value)

JScript

public function get HostName
 () : String

public function set HostName
 (value : String)

プロパティ値
サーバーのプライマリホスト名を格納する文字列。

解説

HostName プロパティは、サーバーのプライマリホスト名を格納します。サーバーの DNS エントリが追加のエイリアスを定義している場合は、Aliases プロパティでその情報を取得できます。

使用例

HostName プロパティを使用して、プライマリホスト名を取得する例を次に示します。

Visual Basic

Public Sub GetIpAddressList(hostString As
 [String])
    Try
        ' Get 'IPHostEntry' object which contains information like host
 name, IP addresses, aliases
    ' for specified url
        Dim hostInfo As IPHostEntry = Dns.GetHostByName(hostString)
        Console.WriteLine(("Host name : " + hostInfo.HostName))
        Console.WriteLine("IP address List : ")
        Dim index As Integer
        For index = 0 To hostInfo.AddressList.Length
 - 1
            Console.WriteLine(hostInfo.AddressList(index))
        Next index
    Catch e As SocketException
        Console.WriteLine("SocketException caught!!!")
        Console.WriteLine(("Source : " + e.Source))
        Console.WriteLine(("Message : " + e.Message))
    Catch e As ArgumentNullException
        Console.WriteLine("ArgumentNullException 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 'GetIpAddressList

public void GetIpAddressList(String hostString)
{
    try 
    {
        // Get 'IPHostEntry' object containing information like host
 name, IP addresses, aliases for a host.
        IPHostEntry hostInfo = Dns.GetHostByName(hostString);
        Console.WriteLine("Host name : " + hostInfo.HostName);
        Console.WriteLine("IP address List : ");
        for(int index=0; index < hostInfo.AddressList.Length;
 index++)
        {
            Console.WriteLine(hostInfo.AddressList[index]);
        }
    }
    catch(SocketException e) 
    {
        Console.WriteLine("SocketException caught!!!");
        Console.WriteLine("Source : " + e.Source);
        Console.WriteLine("Message : " + e.Message);
    }
    catch(ArgumentNullException e)
    {
        Console.WriteLine("ArgumentNullException 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);
    }
}

C++

void GetIpAddressList( String^ hostString )
{
   try
   {
      // Get 'IPHostEntry' object containing information
      // like host name, IP addresses, aliases for a host.
      IPHostEntry^ hostInfo = Dns::GetHostByName( hostString );
      Console::WriteLine( "Host name : {0}", hostInfo->HostName );
      Console::WriteLine( "IP address List : " );
      for ( int index = 0; index < hostInfo->AddressList->Length;
 index++ )
         Console::WriteLine( hostInfo->AddressList[ index ] );
   }
   catch ( SocketException^ e ) 
   {
      Console::WriteLine( "SocketException caught!!!" );
      Console::WriteLine( "Source : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }
   catch ( ArgumentNullException^ e ) 
   {
      Console::WriteLine( "ArgumentNullException 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 );
   }
}

    public void GetIpAddressList(String hostString)
    {
        try {
            // Get 'IPHostEntry' object containing information like
 host name,
            //IP addresses, aliases for a host.
            IPHostEntry hostInfo = Dns.GetHostByName(hostString);

            Console.WriteLine("Host name : " + hostInfo.get_HostName());
            Console.WriteLine("IP address List : ");
            for (int index = 0; index <
 hostInfo.get_AddressList().
                length; index++) {
                Console.WriteLine(hostInfo.get_AddressList().get_Item(index));
            }
        }
        catch (SocketException e) {
            Console.WriteLine("SocketException caught!!!");
            Console.WriteLine("Source : " + e.get_Source());
            Console.WriteLine("Message : " + e.get_Message());
        }
        catch (ArgumentNullException e) {
            Console.WriteLine("ArgumentNullException caught!!!");
            Console.WriteLine("Source : " + e.get_Source());
            Console.WriteLine("Message : " + e.get_Message());
        }
        catch (System.Exception e) {
            Console.WriteLine("Exception caught!!!");
            Console.WriteLine("Source : " + e.get_Source());
            Console.WriteLine("Message : " + e.get_Message());
        }
    } //GetIpAddressList
} //HostInfoSample