FileIOPermission.FromXml メソッドとは? わかりやすく解説

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FileIOPermission.FromXml メソッド

XML エンコーディングから、指定した状態のアクセス許可再構築ます。

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

Public Overrides Sub FromXml
 ( _
    esd As SecurityElement _
)
Dim instance As FileIOPermission
Dim esd As SecurityElement

instance.FromXml(esd)
public override void FromXml (
    SecurityElement esd
)
public:
virtual void FromXml (
    SecurityElement^ esd
) override
public void FromXml (
    SecurityElement esd
)
public override function FromXml (
    esd : SecurityElement
)

パラメータ

esd

アクセス許可再構築使用する XML エンコーディング

例外例外
例外種類条件

ArgumentNullException

esd パラメータnull 参照 (Visual Basic では Nothing) です。

ArgumentException

esd パラメータ有効なアクセス許可要素ではありません。

または

esd パラメータバージョン番号には互換性がありません。

使用例使用例
    Private Function ToFromXmlDemo() As
 Boolean

        Dim returnValue As Boolean
 = True

        Dim fileIO1 As String
 = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission

        Dim fileIOGen1 As New
 FileIOGenerator()
        Dim fileIOGen2 As New
 FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1)
            End If
            Console.WriteLine("********************************************************"
 & ControlChars.Lf)
            fileIOGen2.ResetIndex()
            Try
                fileIOPerm2 = New FileIOPermission(PermissionState.None)
                fileIOPerm2.FromXml(fileIOPerm1.ToXml())
                Console.WriteLine(("Result of ToFromXml = "
 & fileIOPerm2.ToString() & ControlChars.Lf))

            Catch e As Exception
                Console.WriteLine(("ToFromXml failed :"
 & fileIOPerm1.ToString() & e.ToString()))
                GoTo ContinueWhile1
            End Try
ContinueWhile1:
        End While

        Return returnValue
    End Function 'ToFromXmlDemo
private bool ToFromXmlDemo()
{

    bool returnValue = true;

    string fileIO1;
    FileIOPermission fileIOPerm1, fileIOPerm2;

    FileIOGenerator fileIOGen1 = new FileIOGenerator();
    FileIOGenerator fileIOGen2 = new FileIOGenerator();

    fileIOGen1.ResetIndex();
    while (fileIOGen1.CreateFilePath( out fileIO1 ))
    {
        if (fileIO1 == "")
            fileIOPerm1 = new FileIOPermission(PermissionState.None);
        else
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read,
 fileIO1);

        Console.WriteLine("********************************************************\n");
        fileIOGen2.ResetIndex();
        try
        {
            fileIOPerm2 = new FileIOPermission(PermissionState.None);
            fileIOPerm2.FromXml(fileIOPerm1.ToXml());
            Console.WriteLine("Result of ToFromXml = " + fileIOPerm2.ToString()
 + "\n");

        }
        catch (Exception e)
        {
            Console.WriteLine("ToFromXml failed :" + fileIOPerm1.ToString()
 + e);
            continue;
        }
    }

    return returnValue;

}
bool ToFromXmlDemo()
{
   bool returnValue = true;
   String^ fileIO1;
   FileIOPermission^ fileIOPerm1;
   FileIOPermission^ fileIOPerm2;
   FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
   FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
   fileIOGen1->ResetIndex();
   while ( fileIOGen1->CreateFilePath( &fileIO1 ) )
   {
      if (fileIO1 == "")
          fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
       else
           fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO1);

      Console::WriteLine( "********************************************************\n"
 );
      fileIOGen2->ResetIndex();
      try
      {
         fileIOPerm2 = gcnew FileIOPermission( PermissionState::None );
         fileIOPerm2->FromXml( fileIOPerm1->ToXml() );
         Console::WriteLine( "Result of ToFromXml = {0}\n", fileIOPerm2
 );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "ToFromXml failed :{0}{1}", fileIOPerm1, e
 );
         continue;
      }

   }

   return returnValue;
}


// ToXml creates an XML encoding of the permission and its current state;
// FromXml reconstructs a permission with the specified state from the
 XML
// encoding.
private boolean ToFromXmlDemo() 
{
    boolean returnValue = true;
    String fileIO1[] = new String[1];
    FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
    FileIOPermission fileIOPerm2[] = new FileIOPermission[1];

    FileIOGenerator fileIOGen1 =  new FileIOGenerator();
    FileIOGenerator fileIOGen2 =  new FileIOGenerator();
    
    fileIOGen1.ResetIndex();
    while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1, 
        FileIOPermissionAccess.Read)) {
        if (fileIOPerm1[0] == null) {
            continue ;
        }
        Console.WriteLine("**********************************" 
            + "**********************\n");
        fileIOGen2.ResetIndex();
        try {
            fileIOPerm2[0] = new FileIOPermission(PermissionState.None);
            fileIOPerm2[0].FromXml(fileIOPerm1[0].ToXml());
            Console.WriteLine(("Result of ToFromXml = " 
                + fileIOPerm2[0].ToString() + "\n"));
        } 
        catch(System.Exception  e) {
            Console.WriteLine(("ToFromXml failed :" 
                + fileIOPerm1[0].ToString() + e));
            continue ;
        }
    }
    return returnValue ;
} //ToFromXmlDemo    
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
FileIOPermission クラス
FileIOPermission メンバ
System.Security.Permissions 名前空間



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