FileIOPermissionAttribute(SecurityAction) Constructor

public:
 FileIOPermissionAttribute(System::Security::Permissions::SecurityAction action);

public FileIOPermissionAttribute (System.Security.Permissions.SecurityAction action);

new System.Security.Permissions.FileIOPermissionAttribute : System.Security.Permissions.SecurityAction -> System.Security.Permissions.FileIOPermissionAttribute

Public Sub New (action As SecurityAction)

Parámetros

Excepciones

Ejemplos

En el ejemplo de código siguiente se crean varias instancias de la FileIOPermissionAttribute clase para establecer distintos niveles de permisos de E/S de archivo.

// This sample demonstrates the use of the FileIOPermissionAttribute class.
// The sample follows the recommended procedure of first granting PermitOnly permissions, 
// then using a Deny on that set of granted permissions.  
using namespace System;
using namespace System::Reflection;
using namespace System::Security::Permissions;
using namespace System::Security;
using namespace System::IO;
void PermitOnlyMethod();
void PermitOnlyTestMethod();
void TestFailed();


// This method demonstrates the use of the FileIOPermissionAttribute to create a PermitOnly permission.
// Set the Read property.
[FileIOPermissionAttribute(SecurityAction::PermitOnly,Read="C:\\")]
// Set the PathDiscovery property.
[FileIOPermissionAttribute(SecurityAction::PermitOnly,
PathDiscovery="C:\\Documents and Settings\\All Users")]
// Set the Append property.
[FileIOPermissionAttribute(SecurityAction::PermitOnly,
Append="C:\\Documents and Settings\\All Users\\Application Data")]
// Set the Write property.
[FileIOPermissionAttribute(SecurityAction::PermitOnly,
Write="C:\\Documents and Settings\\All Users\\Application Data\\Microsoft")]
// Set the All property.
[FileIOPermissionAttribute(SecurityAction::PermitOnly,
All="C:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network")]

void PermitOnlyMethod()
{
   Console::WriteLine( "Executing PermitOnlyMethod." );
   Console::WriteLine( "PermitOnly the Read permission for drive C." );
   Console::WriteLine( "PermitOnly the PathDiscovery permission for \n\tC:\\Documents and Settings\\All Users." );
   Console::WriteLine( "PermitOnly the Append permission for \n\tC:\\Documents and Settings\\All Users\\Application Data." );
   Console::WriteLine( "PermitOnly the Write permission for  \n\tC:\\Documents and Settings\\All Users\\Application Data\\Microsoft." );
   Console::WriteLine( "PermitOnly the All permission for \n\tC:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network." );
   PermitOnlyTestMethod();
}

void PermitOnlyTestMethod()
{
    Console::WriteLine("Executing PermitOnlyTestMethod.");
    try
    {
        PermissionSet^ ps = gcnew PermissionSet(PermissionState::None);
        ps->AddPermission(gcnew FileIOPermission(FileIOPermissionAccess::Write,
            "C:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network\\SomeFile"));
        Console::WriteLine("Demanding permission to write " +
            "'C:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network\\SomeFile'");
        ps->Demand();
        Console::WriteLine("Demand succeeded.");
        ps->AddPermission(
            gcnew FileIOPermission(FileIOPermissionAccess::Write,
            "C:\\"));
        Console::WriteLine("Demanding permission to write to drive C.");

        // This demand should cause an exception.
        ps->Demand();
        // The TestFailed method is called if an exception is not thrown.
        TestFailed();
     }
    catch (Exception^ e)
    {
        Console::WriteLine("An exception was thrown because of a write demand: " + e->Message);
    }
}

void TestFailed()
{
   Console::WriteLine( "Executing TestFailed." );
   Console::WriteLine( "Throwing an exception." );
   throw gcnew Exception;
}

int main()
{
   try
   {
      PermitOnlyMethod();
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e->Message );
   }
}

// This sample demonstrates the use of the FileIOPermissionAttribute class.
// The sample follows the recommended procedure of first granting PermitOnly permissions,
// then using a Deny on that set of granted permissions.

using System;
using System.Reflection;
using System.Security.Permissions;
using System.Security;
using System.IO;

class MyClass
{

    // This method demonstrates the use of the FileIOPermissionAttribute to create a PermitOnly permission.
    // Set the Read property.
    [FileIOPermissionAttribute(SecurityAction.PermitOnly, Read = "C:\\")]
    // Set the PathDiscovery property.
    [FileIOPermissionAttribute(SecurityAction.PermitOnly,
         PathDiscovery = "C:\\Documents and Settings\\All Users")]
    // Set the Append property.
    [FileIOPermissionAttribute(SecurityAction.PermitOnly,
         Append = "C:\\Documents and Settings\\All Users\\Application Data")]
    // Set the Write property.
    [FileIOPermissionAttribute(SecurityAction.PermitOnly,
         Write = "C:\\Documents and Settings\\All Users\\Application Data\\Microsoft")]
    // Set the All property.
    [FileIOPermissionAttribute(SecurityAction.PermitOnly,
         All = "C:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network")]
    public static void PermitOnlyMethod()
    {
        Console.WriteLine("Executing PermitOnlyMethod.");
        Console.WriteLine("PermitOnly the Read permission for drive C.");
        Console.WriteLine("PermitOnly the PathDiscovery permission for \n\tC:\\Documents and Settings\\All Users.");
        Console.WriteLine("PermitOnly the Append permission for \n\tC:\\Documents and Settings\\All Users\\Application Data.");
        Console.WriteLine("PermitOnly the Write permission for \n\tC:\\Documents and Settings\\All Users\\Application Data\\Microsoft.");
        Console.WriteLine("PermitOnly the All permission for \n\tC:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network.");

        PermitOnlyTestMethod();
    }

    public static void PermitOnlyTestMethod()
    {
        Console.WriteLine("Executing PermitOnlyTestMethod.");
        try
        {
            PermissionSet ps = new PermissionSet(PermissionState.None);
            ps.AddPermission(new FileIOPermission(FileIOPermissionAccess.Write,
                "C:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network\\SomeFile"));
            Console.WriteLine("Demanding permission to write " +
                "'C:\\Documents and Settings\\All Users\\Application Data\\Microsoft\\Network\\SomeFile'");
            ps.Demand();
            Console.WriteLine("Demand succeeded.");
            ps.AddPermission(
                new FileIOPermission(FileIOPermissionAccess.Write,
                "C:\\"));
            Console.WriteLine("Demanding permission to write to drive C.");

            // This demand should cause an exception.
            ps.Demand();
            // The TestFailed method is called if an exception is not thrown.
            TestFailed();
        }
        catch (Exception e)
        {
            Console.WriteLine("An exception was thrown because of a write demand: " + e.Message);
        }
    }

    public static void TestFailed()
    {
        Console.WriteLine("Executing TestFailed.");
        Console.WriteLine("Throwing an exception.");
        throw new Exception();
    }

    static void Main(string[] args)
    {
        try
        {
            PermitOnlyMethod();
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message.ToString());
        }
    }
}

' This sample demonstrates the use of the FileIOPermissionAttribute class.
' The sample follows the recommended procedure of first granting PermitOnly permissions, 
' then using a Deny on that set of granted permissions.  
Imports System.Reflection
Imports System.Security.Permissions
Imports System.Security
Imports System.IO

Class [MyClass]


    ' This method demonstrates the use of the FileIOPermissionAttribute to create a PermitOnly permission.
    ' Set the Read, PathDiscovery, Append, Write, and All properties.
    <FileIOPermissionAttribute(SecurityAction.PermitOnly, Read:="C:\"), _
    FileIOPermissionAttribute(SecurityAction.PermitOnly, _
    PathDiscovery:="C:\Documents and Settings\All Users"), _
    FileIOPermissionAttribute(SecurityAction.PermitOnly, _
    Append:="C:\Documents and Settings\All Users\Application Data"), _
    FileIOPermissionAttribute(SecurityAction.PermitOnly, _
        Write:="C:\Documents and Settings\All Users\Application Data\Microsoft"), _
    FileIOPermissionAttribute(SecurityAction.PermitOnly, _
        All:="C:\Documents and Settings\All Users\Application Data\Microsoft\Network")> _
    Public Shared Sub PermitOnlyMethod()
        Console.WriteLine("Executing PermitOnlyMethod.")
        Console.WriteLine("PermitOnly the Read permission for drive C.")
        Console.WriteLine("PermitOnly the PathDiscovery permission for " & ControlChars.Lf & ControlChars.Tab & "C:\Documents and Settings\All Users.")
        Console.WriteLine("PermitOnly the Append permission for " & ControlChars.Lf & ControlChars.Tab & "C:\Documents and Settings\All Users\Application Data.")
        Console.WriteLine("PermitOnly the Write permission for  " & ControlChars.Lf & ControlChars.Tab & "C:\Documents and Settings\All Users\Application Data\Microsoft.")
        Console.WriteLine("PermitOnly the All permission for " & ControlChars.Lf & ControlChars.Tab & "C:\Documents and Settings\All Users\Application Data\Microsoft\Network.")

        PermitOnlyTestMethod()
    End Sub


    Public Shared Sub PermitOnlyTestMethod()
        Console.WriteLine("Executing PermitOnlyTestMethod.")
        Try
            Dim ps As New PermissionSet(PermissionState.None)
            ps.AddPermission(New FileIOPermission(FileIOPermissionAccess.Write, "C:\Documents and Settings\All Users\Application Data\Microsoft\Network\SomeFile"))
            Console.WriteLine(("Demanding permission to write " & "'C:\Documents and Settings\All Users\Application Data\Microsoft\Network\SomeFile'"))
            ps.Demand()
            Console.WriteLine("Demand succeeded.")
            ps.AddPermission(New FileIOPermission(FileIOPermissionAccess.Write, "C:\"))
            Console.WriteLine("Demanding permission to write to drive C.")

            ' This demand should cause an exception.
            ps.Demand()
            ' The TestFailed method is called if an exception is not thrown.
            TestFailed()
        Catch e As Exception
            Console.WriteLine(("An exception was thrown because of a write demand: " & e.Message))
        End Try
    End Sub


    Public Shared Sub TestFailed()
        Console.WriteLine("Executing TestFailed.")
        Console.WriteLine("Throwing an exception.")
        Throw New Exception()
    End Sub

    Overloads Shared Sub Main(ByVal args() As String)
        Try
            PermitOnlyMethod()
        Catch e As Exception
            Console.WriteLine(e.Message.ToString())
        End Try
    End Sub
End Class

Se aplica a