DnsPermission.FromXml メソッド

.NET Framework クラス ライブラリ リファレンス

DnsPermission.FromXml メソッド

XML エンコーディングから DnsPermission インスタンスを再構築します。

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

Visual Basic (宣言)

Public Overrides Sub FromXml
 ( _
    securityElement As SecurityElement _
)

Visual Basic (使用法)

Dim instance As DnsPermission
Dim securityElement As SecurityElement

instance.FromXml(securityElement)

C#

public override void FromXml (
    SecurityElement securityElement
)

C++

public:
virtual void FromXml (
    SecurityElement^ securityElement
) override

J#

public void FromXml (
    SecurityElement securityElement
)

JScript

public override function FromXml (
    securityElement : SecurityElement
)

パラメータ

securityElement

DnsPermission インスタンスの再構築に使用する XML エンコーディング。

例外

例外の種類	条件
ArgumentNullException	securityElement が null 参照 (Visual Basic では Nothing) です。
ArgumentException	securityElement が DnsPermission ではありません。

解説

FromXml メソッドは、SecurityElement クラスで定義される XML エンコーディングから DnsPermission インスタンスを再構築します。

ToXml メソッドを使用して、ステータス情報を含む DnsPermission インスタンスを XML でエンコードします。

使用例

XML エンコーディングから DnsPermission インスタンスを再構築する例を次に示します。

Visual Basic

Public Sub ConstructDnsPermission()
    Try
        ' Create a DnsPermission instance.
        Dim permission As New
 DnsPermission(PermissionState.None)
        ' Create a SecurityElement instance by calling the ToXml method
 on the
        ' DnsPermission instance and print its attributes, 
        ' which hold the  XML encoding of the DnsPermission instance.
        Console.WriteLine("Attributes and Values of
 'DnsPermission' instance :")
        PrintKeysAndValues(permission.ToXml().Attributes)
        
        ' Create a SecurityElement instacnce .
        Dim securityElementObj As New
 SecurityElement("IPermission")
        ' Add attributes and values of the SecurityElement instance
 corresponding to
        ' teh permission instance.
        securityElementObj.AddAttribute("version",
 "1")
        securityElementObj.AddAttribute("Unrestricted",
 "true")
        securityElementObj.AddAttribute("class", "System.Net.DnsPermission")
        
        ' Reconstruct a DnsPermission instance from an XML encoding.
        Dim permission1 As New
 DnsPermission(PermissionState.None)
        permission1.FromXml(securityElementObj)
        
        ' Print the attributes and values of the constructed DnsPermission
 object.
        Console.WriteLine("After reconstruction Attributes and
 Values of new DnsPermission instance :")
        PrintKeysAndValues(permission1.ToXml().Attributes)
    Catch e As NullReferenceException
        Console.WriteLine("NullReferenceException caught!!!")
        Console.WriteLine(("Source : " + e.Source))
        Console.WriteLine(("Message : " + e.Message))
    Catch e As SecurityException
        Console.WriteLine("SecurityException 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 'ConstructDnsPermission


Private Sub PrintKeysAndValues(myList As
 Hashtable)
    ' Get the enumerator that can iterate through the hash table.
    Dim myEnumerator As IDictionaryEnumerator
 = myList.GetEnumerator()
    Console.WriteLine(ControlChars.Tab + "-KEY-" +
 ControlChars.Tab + "-VALUE-")
    While myEnumerator.MoveNext()
        Console.WriteLine(ControlChars.Tab + "{0}:"
 + ControlChars.Tab + "{1}", myEnumerator.Key, myEnumerator.Value)
    End While
    Console.WriteLine()
End Sub 'PrintKeysAndValues

C#

public void ConstructDnsPermission() {
  try 
  {
    // Create a DnsPermission instance.
    DnsPermission permission = new DnsPermission(PermissionState.None);
    // Create a SecurityElement instance by calling the ToXml method
 on the 
    // DnsPermission instance.
    // Print its attributes, which hold the  XML encoding of the DnsPermission
    // instance.
    Console.WriteLine("Attributes and Values of 'DnsPermission' instance :");
    PrintKeysAndValues(permission.ToXml().Attributes);

    // Create a SecurityElement instance.
    SecurityElement securityElementObj = new SecurityElement("IPermission");
    // Add attributes and values of the SecurityElement instance corresponding
 to
    // the permission instance. 
    securityElementObj.AddAttribute("version", "1");
    securityElementObj.AddAttribute("Unrestricted", "true");
    securityElementObj.AddAttribute("class","System.Net.DnsPermission");
                     
    // Reconstruct a DnsPermission instance from an XML encoding.
      DnsPermission permission1 = new DnsPermission(PermissionState.None);
    permission1.FromXml(securityElementObj);

    // Print the attributes and values of the constructed DnsPermission
 object.
    Console.WriteLine("After reconstruction Attributes and Values of new
 DnsPermission instance :");
    PrintKeysAndValues(permission1.ToXml().Attributes);
  }
  catch(NullReferenceException e) 
  {
    Console.WriteLine("NullReferenceException caught!!!");
    Console.WriteLine("Source : " + e.Source);
    Console.WriteLine("Message : " + e.Message);
  }
  catch(SecurityException e) 
  {
    Console.WriteLine("SecurityException 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);
  }
}

private void PrintKeysAndValues(Hashtable myList)
 {
   // Get the enumerator that can iterate through the hash table.
   IDictionaryEnumerator myEnumerator = myList.GetEnumerator();
   Console.WriteLine("\t-KEY-\t-VALUE-");
   while (myEnumerator.MoveNext())
      Console.WriteLine("\t{0}:\t{1}", myEnumerator.Key, myEnumerator.Value);
      Console.WriteLine();
}

C++

public:
   void ConstructDnsPermission()
   {
      try
      {
         // Create a DnsPermission instance.
         DnsPermission^ permission = gcnew DnsPermission( PermissionState::None );
         // Create a SecurityElement instance by calling the ToXml method
 on the
         // DnsPermission instance.
         // Print its attributes, which hold the  XML encoding of the
 DnsPermission
         // instance.
         Console::WriteLine( "Attributes and Values of 'DnsPermission' instance
 :" );
         PrintKeysAndValues( permission->ToXml()->Attributes );
         
         // Create a SecurityElement instance.
         SecurityElement^ securityElementObj = gcnew SecurityElement( "IPermission"
 );
         // Add attributes and values of the SecurityElement instance corresponding
 to
         // the permission instance.
         securityElementObj->AddAttribute( "version", "1"
 );
         securityElementObj->AddAttribute( "Unrestricted", "true"
 );
         securityElementObj->AddAttribute( "class",
 "System.Net.DnsPermission" );
         
         // Reconstruct a DnsPermission instance from an XML encoding.
         DnsPermission^ permission1 = gcnew DnsPermission( PermissionState::None
 );
         permission1->FromXml( securityElementObj );
         
         // Print the attributes and values of the constructed DnsPermission
 Object*.
         Console::WriteLine( "After reconstruction Attributes and Values of
 new DnsPermission instance :" );
         PrintKeysAndValues( permission1->ToXml()->Attributes );
      }
      catch ( NullReferenceException^ e ) 
      {
         Console::WriteLine( "NullReferenceException caught!!!" );
         Console::WriteLine( "Source : {0}", e->Source );
         Console::WriteLine( "Message : {0}", e->Message );
      }
      catch ( SecurityException^ e ) 
      {
         Console::WriteLine( "SecurityException 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 );
      }
   }

private:
   void PrintKeysAndValues( Hashtable^ myList )
   {
      // Get the enumerator that can iterate through the hash table.
      IDictionaryEnumerator^ myEnumerator = myList->GetEnumerator();
      Console::WriteLine( "\t-KEY-\t-VALUE-" );
      while ( myEnumerator->MoveNext() )
      {
         Console::WriteLine( "\t {0}:\t {1}", myEnumerator->Key, myEnumerator->Value
 );
      }
      Console::WriteLine();
   }

J#

public void ConstructDnsPermission()
{
    try {
        // Create a DnsPermission instance.
        DnsPermission permission = 
            new DnsPermission(PermissionState.None);

        // Create a SecurityElement instance by calling the ToXml 
        // method on the DnsPermission instance.
        // Print its attributes, which hold the  XML encoding of the
 
        // DnsPermission instance.
        Console.WriteLine("Attributes and Values of 'DnsPermission' "
            + "instance :");
        PrintKeysAndValues(permission.ToXml().get_Attributes());

        // Create a SecurityElement instance.
        SecurityElement securityElementObj = 
            new SecurityElement("IPermission");

        // Add attributes and values of the SecurityElement instance
 
        // corresponding to the permission instance. 
        securityElementObj.AddAttribute("version", "1");
        securityElementObj.AddAttribute("Unrestricted", "true");
        securityElementObj.AddAttribute("class", 
            "System.Net.DnsPermission");

        // Reconstruct a DnsPermission instance from an XML encoding.
        DnsPermission permission1 = 
            new DnsPermission(PermissionState.None);
        permission1.FromXml(securityElementObj);

        // Print the attributes and values of the constructed
        // DnsPermission object.
        Console.WriteLine("After reconstruction Attributes and Values "
            + "of new DnsPermission instance :");
        PrintKeysAndValues(permission1.ToXml().get_Attributes());
    }
    catch (NullReferenceException e) {
        Console.WriteLine("NullReferenceException caught!!!");
        Console.WriteLine("Source : " + e.get_Source());
        Console.WriteLine("Message : " + e.get_Message());
    }
    catch (SecurityException e) {
        Console.WriteLine("SecurityException 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());
    }
} //ConstructDnsPermission

private void PrintKeysAndValues(Hashtable myList)
{
    // Get the enumerator that can iterate through the hash table.
    IDictionaryEnumerator myEnumerator = myList.GetEnumerator();
    Console.WriteLine("\t-KEY-\t-VALUE-");
    while (myEnumerator.MoveNext()) {
        Console.WriteLine("\t{0}:\t{1}", myEnumerator.get_Key(),
            myEnumerator.get_Value());
    }
    Console.WriteLine();
} //PrintKeysAndValues

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
DnsPermission クラス
DnsPermission メンバ
System.Net 名前空間
SecurityElement