IsolatedStorageFilePermission.ToXml メソッド

.NET Framework クラス ライブラリ リファレンス

IsolatedStorageFilePermission.ToXml メソッド

アクセス許可とその現在の状態を表す XML エンコーディングを作成します。

名前空間: System.Security.Permissions
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

<ComVisibleAttribute(False)> _
Public Overrides Function
 ToXml As SecurityElement

Visual Basic (使用法)

Dim instance As IsolatedStorageFilePermission
Dim returnValue As SecurityElement

returnValue = instance.ToXml

C#

[ComVisibleAttribute(false)] 
public override SecurityElement ToXml ()

C++

[ComVisibleAttribute(false)] 
public:
virtual SecurityElement^ ToXml () override

J#

/** @attribute ComVisibleAttribute(false) */ 
public SecurityElement ToXml ()

JScript

ComVisibleAttribute(false) 
public override function ToXml () : SecurityElement

戻り値
状態情報を含む、アクセス許可の XML エンコーディング。

解説

ToXml メソッドにより、IsolatedStorageFilePermission はセキュリティ目的で XML エンコードされます。

使用例

ToXml メソッドの使用方法を次のコード例に示します。このコード例は、IsolatedStorageFilePermission クラスのトピックで取り上げているコード例の一部分です。

Visual Basic

Private Sub To_FromXmlDemo()
    Console.WriteLine(ControlChars.Lf + "To_FromXML demo.")
    Dim firstPermission As New
 IsolatedStorageFilePermission(PermissionState.Unrestricted)
    Console.WriteLine(("First permission: " + firstPermission.ToString()))
    Dim se As SecurityElement = firstPermission.ToXml()
    Dim secondPermission As New
 IsolatedStorageFilePermission(PermissionState.None)
    Console.WriteLine(("Second permission: " + secondPermission.ToString()))
    secondPermission.FromXml(se)
    Dim thirdPermission As IsolatedStorageFilePermission
 = CType(secondPermission.Intersect(firstPermission), IsolatedStorageFilePermission)
    Console.WriteLine(("Intersection of first permission and second
 permission: " + thirdPermission.ToString()))

    Try
        If False = thirdPermission.IsUnrestricted()
 Then
            Console.WriteLine("To_FromXml demo failed: The ToXml,
 FromXml roundtrip did not succeed.")
        End If
    Catch e As Exception
        Console.WriteLine("To_FromXml demo failed: An exception
 was thrown when checking the intersection")
        Console.WriteLine("of the permissions after the XML roundtrip.")
        Console.WriteLine(e.ToString())

        Console.WriteLine(e.ToString())
    End Try
End Sub 'To_FromXmlDemo

C#

private void To_FromXmlDemo()
{
    Console.WriteLine
        ("\nTo_FromXML demo.");
    IsolatedStorageFilePermission firstPermission = new IsolatedStorageFilePermission(PermissionState.Unrestricted);
    Console.WriteLine
        ("First permission: " + firstPermission.ToString());
    SecurityElement se = firstPermission.ToXml();
    IsolatedStorageFilePermission secondPermission = new IsolatedStorageFilePermission(PermissionState.None);
    Console.WriteLine
        ("Second permission: " + secondPermission.ToString());
    secondPermission.FromXml(se);
    IsolatedStorageFilePermission thirdPermission = (IsolatedStorageFilePermission)secondPermission.Intersect(firstPermission);
    Console.WriteLine
        ("Intersection of first permission and second permission: " + thirdPermission.ToString());

    try
    {
        if (false == thirdPermission.IsUnrestricted())
        {
            Console.WriteLine
                ("To_FromXml demo failed: The ToXml, FromXml roundtrip did not
 succeed.");
        }
    }
    catch (Exception e)
    {
        Console.WriteLine("To_FromXml demo failed: An exception was thrown when
 checking the intersection");
        Console.WriteLine("of the permissions after the XML roundtrip.");
        Console.WriteLine(e.ToString());

        Console.WriteLine(e.ToString());
    }

}

C++

void To_FromXmlDemo()
{
   Console::WriteLine( "\nTo_FromXML demo." );
   IsolatedStorageFilePermission^ firstPermission = gcnew IsolatedStorageFilePermission(
 PermissionState::Unrestricted );
   Console::WriteLine( "First permission: {0}", firstPermission );
   SecurityElement^ se = firstPermission->ToXml();
   IsolatedStorageFilePermission^ secondPermission = gcnew IsolatedStorageFilePermission(
 PermissionState::None );
   Console::WriteLine( "Second permission: {0}", secondPermission );
   secondPermission->FromXml( se );
   IsolatedStorageFilePermission^ thirdPermission = dynamic_cast<IsolatedStorageFilePermission^>(secondPermission->Intersect(
 firstPermission ));
   Console::WriteLine( "Intersection of first permission and second permission:
 {0}", thirdPermission );
   try
   {
      if ( false == thirdPermission->IsUnrestricted()
 )
      {
         Console::WriteLine( "To_FromXml demo failed: The ToXml, FromXml roundtrip
 did not succeed." );
      }
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "To_FromXml demo failed: An exception was thrown when
 checking the intersection" );
      Console::WriteLine( "of the permissions after the XML roundtrip."
 );
      Console::WriteLine( e );
      Console::WriteLine( e );
   }

}

J#

private void To_FromXmlDemo()
{
    Console.WriteLine("\nTo_FromXML demo.");
    IsolatedStorageFilePermission firstPermission = 
        new IsolatedStorageFilePermission(PermissionState.Unrestricted);
    Console.WriteLine(("First permission: " + firstPermission.ToString()));
    SecurityElement se = firstPermission.ToXml();
    IsolatedStorageFilePermission secondPermission = 
        new IsolatedStorageFilePermission(PermissionState.None);
    Console.WriteLine(("Second permission: " 
        + secondPermission.ToString()));
    secondPermission.FromXml(se);
    IsolatedStorageFilePermission thirdPermission = 
        ((IsolatedStorageFilePermission)
        (secondPermission.Intersect(firstPermission)));
    Console.WriteLine(("Intersection of first permission and " 
        + "second permission: " + thirdPermission.ToString()));

    try {
        if (false == thirdPermission.IsUnrestricted())
 {
            Console.WriteLine("To_FromXml demo failed: The ToXml, " 
                + "FromXml roundtrip did not succeed.");
        }
    }
    catch (System.Exception e) {
        Console.WriteLine("To_FromXml demo failed: An exception " 
            + "was thrown when checking the intersection");
        Console.WriteLine("of the permissions after the XML roundtrip.");
        Console.WriteLine(e.ToString());
        Console.WriteLine(e.ToString());
    }
} //To_FromXmlDemo   

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
IsolatedStorageFilePermission クラス
IsolatedStorageFilePermission メンバ
System.Security.Permissions 名前空間