FileIOPermission.GetPathList(FileIOPermissionAccess) Метод

Определение

Пространство имен:

System.Security.Permissions

Сборка:

System.Security.Permissions.dll

Сборка:

mscorlib.dll

Возвращает все файлы и каталоги с заданным FileIOPermissionAccess.

public:
 cli::array <System::String ^> ^ GetPathList(System::Security::Permissions::FileIOPermissionAccess access);

public string[] GetPathList (System.Security.Permissions.FileIOPermissionAccess access);

member this.GetPathList : System.Security.Permissions.FileIOPermissionAccess -> string[]

Public Function GetPathList (access As FileIOPermissionAccess) As String()

Параметры

access

FileIOPermissionAccess

Одно из значений FileIOPermissionAccess, представляющее один тип доступа к файлам.

Возвращаемое значение

String[]

Массив, содержащий пути к файлам и каталогам, к которым предоставлен доступ, заданный параметром access.

Исключения

ArgumentException

access не является допустимым значением FileIOPermissionAccess.

-или- access имеет значение AllAccess, которое представляет несколько типов доступа к файлам, или NoAccess, которое не представляет ни один тип доступа к файлам.

Примеры

В следующем примере кода показано использование GetPathList метода. Этот пример является частью более крупного примера, предоставленного FileIOPermission для класса.

bool SetGetPathListDemo()
{
   try
   {
      Console::WriteLine( "********************************************************\n" );
      FileIOPermission^ fileIOPerm1;
      Console::WriteLine( "Creating a FileIOPermission with AllAccess rights for 'C:\\Examples\\Test\\TestFile.txt" );
      
      fileIOPerm1 = gcnew FileIOPermission( FileIOPermissionAccess::AllAccess,"C:\\Examples\\Test\\TestFile.txt" );
      
      Console::WriteLine( "Adding 'C:\\Temp' to the write access list, and \n 'C:\\Examples\\Test' to read access." );
      fileIOPerm1->AddPathList( FileIOPermissionAccess::Write, "C:\\Temp" );
      fileIOPerm1->AddPathList( FileIOPermissionAccess::Read, "C:\\Examples\\Test" );
      array<String^>^paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read );
      Console::WriteLine( "Read access before SetPathList = " );
      IEnumerator^ myEnum = paths->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         String^ path = safe_cast<String^>(myEnum->Current);
         Console::WriteLine( "\t{0}", path );
      }

      Console::WriteLine( "Setting the read access list to \n'C:\\Temp'" );
      fileIOPerm1->SetPathList( FileIOPermissionAccess::Read, "C:\\Temp" );
      paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read );
      Console::WriteLine( "Read access list after SetPathList = " );
      IEnumerator^ myEnum1 = paths->GetEnumerator();
      while ( myEnum1->MoveNext() )
      {
         String^ path = safe_cast<String^>(myEnum1->Current);
         Console::WriteLine( "\t{0}", path );
      }

      paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Write );
      Console::WriteLine( "Write access list after SetPathList = " );
      IEnumerator^ myEnum2 = paths->GetEnumerator();
      while ( myEnum2->MoveNext() )
      {
         String^ path = safe_cast<String^>(myEnum2->Current);
         Console::WriteLine( "\t{0}", path );
      }

      Console::WriteLine( "Write access = \n{0}", fileIOPerm1->GetPathList( FileIOPermissionAccess::AllAccess ) );
   }
   catch ( ArgumentException^ e ) 
   {
      
      // FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
      Console::WriteLine( "An ArgumentException occurred as a result of using AllAccess. This property cannot be used as a parameter in GetPathList because it represents more than one type of file variable access. : \n{0}", e );
   }

   return true;
}

private bool SetGetPathListDemo()
{
    try
    {
        Console.WriteLine("********************************************************\n");

        FileIOPermission fileIOPerm1;
        Console.WriteLine("Creating a FileIOPermission with AllAccess rights for 'C:\\Examples\\Test\\TestFile.txt");
        fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\\Examples\\Test\\TestFile.txt");
        Console.WriteLine("Adding 'C:\\Temp' to the write access list, and \n 'C:\\Examples\\Test' to read access.");
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\\Temp");
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\\Examples\\Test");
        string[] paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
        Console.WriteLine("Read access before SetPathList = ");
        foreach (string path in paths)
        {
            Console.WriteLine("\t" + path);
        }
        Console.WriteLine("Setting the read access list to \n'C:\\Temp'");
        fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\\Temp");
        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
        Console.WriteLine("Read access list after SetPathList = ");
        foreach (string path in paths)
        {
            Console.WriteLine("\t" + path);
        }

        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write);
        Console.WriteLine("Write access list after SetPathList = ");
        foreach (string path in paths)
        {
            Console.WriteLine("\t" + path);
        }

        Console.WriteLine("Write access = \n" +
            fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess));
    }
    catch (ArgumentException e)
    {
        // FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
        Console.WriteLine("An ArgumentException occurred as a result of using AllAccess. "
            + "This property cannot be used as a parameter in GetPathList "
            + "because it represents more than one type of file variable access. : \n" + e);
    }

    return true;
}

Private Function SetGetPathListDemo() As Boolean
    Try
        Console.WriteLine("********************************************************" & ControlChars.Lf)

        Dim fileIOPerm1 As FileIOPermission
        Console.WriteLine("Creating a FileIOPermission with AllAccess rights for 'C:\Examples\Test\TestFile.txt")
        fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\Examples\Test\TestFile.txt")
        Console.WriteLine("Adding 'C:\Temp' to the write access list, and " & ControlChars.Lf & " 'C:\Examples\Test' to read access.")
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\Temp")
        fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\Examples\Test")
        Dim paths As String() = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
        Console.WriteLine("Read access before SetPathList = ")
        Dim path As String
        For Each path In paths
            Console.WriteLine((ControlChars.Tab & path))
        Next path
        Console.WriteLine("Setting the read access list to " & ControlChars.Lf & "'C:\Temp'")
        fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\Temp")
        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
        Console.WriteLine("Read access list after SetPathList = ")
        For Each path In paths
            Console.WriteLine((ControlChars.Tab & path))
        Next path

        paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write)
        Console.WriteLine("Write access list after SetPathList = ")
        For Each path In paths
            Console.WriteLine((ControlChars.Tab & path))
        Next path

        Dim pathList() As String
        pathList = fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess)

    Catch e As ArgumentException
        ' FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
        Console.WriteLine(("An ArgumentException occurred as a result of using AllAccess. " & "This property cannot be used as a parameter in GetPathList " & "because it represents more than one type of file variable access. : " & ControlChars.Lf & e.ToString()))
    End Try

    Return True
End Function 'SetGetPathListDemo

Комментарии

Используйте этот метод, чтобы получить состояние текущего разрешения. Чтобы получить состояние обоих Read и Write доступа, требуются два вызова этого метода.

Примечание

Параметр access ограничен значениями, представляющими FileIOPermissionAccessотдельные типы доступа к файлам. Эти значения: Read, и AppendWritePathDiscovery. Допустимые значения access не включаются NoAccess и AllAccessне представляют отдельных типов доступа к файлам.