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ZoneIdentityPermission Class

Defines the identity permission for the zone from which the code originates. This class cannot be inherited.

For a list of all members of this type, see ZoneIdentityPermission Members.

System.Object
   System.Security.CodeAccessPermission
      System.Security.Permissions.ZoneIdentityPermission

[Visual Basic]
<Serializable>
NotInheritable Public Class ZoneIdentityPermission
   Inherits CodeAccessPermission
[C#]
[Serializable]
public sealed class ZoneIdentityPermission : CodeAccessPermission
[C++]
[Serializable]
public __gc __sealed class ZoneIdentityPermission : public
   CodeAccessPermission
[JScript]
public
   Serializable
class ZoneIdentityPermission extends CodeAccessPermission

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Remarks

This permission can determine whether calling code is from a certain zone. Zones are configured according to the Microsoft Internet Explorer options, and are mapped from URL by Internet Explorer's IInternetSecurityManager and related APIs. Only exact zone matches are defined for the permission; a URL can only belong to one zone.

  • Local intranet zone: The Local intranet zone is used for content located on a company's intranet. Because the servers are within a company's firewall, content on the intranet is assigned a higher level of trust.
  • Trusted sites zone: The Trusted sites zone is used for content located on Web sites that are considered more reputable or trustworthy than other sites on the Internet. Users can use this zone to assign a higher level of trust to specific Internet sites. The URLs of these trusted Web sites need to be mapped into this zone by the user. By default, sites in the Trusted sites zone receive no higher trust than those in the Internet zone. A user or company needs to change the level of trust granted to this zone if they want the sites it contains to be given a higher level of trust.
  • Internet zone: The Internet zone is used for the Web sites on the Internet that do not belong to another zone. The default settings allow code downloaded from these sites only minimal access to resources on the user's computer. Web sites that are not mapped into other zones automatically fall into this zone.
  • Restricted sites zone: The Restricted sites zone is used for Web sites that contain content that could cause, or could have previously caused, problems when downloaded. This zone could be used to prevent code downloaded from these sites from running on the user's computer. The URLs of these untrusted Web sites need to be mapped into this zone by the user.
  • Local Machine zone: The Local Machine zone is an implicit zone that is used for content that exists on the user's computer. The content found on the user's computer, except for content cached by Internet Explorer on the local system, is treated with a very high level of trust.

Example

[Visual Basic] 
' This sample demonstrates the IsSubsetOf, Union, Intersect, Copy, ToXml and FromXml methods 
' of the ZoneIdentityPermission class.
Imports System
Imports System.Security
Imports System.Security.Permissions
Imports Microsoft.VisualBasic

<Assembly: CLSCompliant(True)> 

Module Module1

    Public Class ZoneIdentityDemo

        ' IsSubsetOf determines whether the current permission is a subset of the specified permission.
        Private Function IsSubsetOfDemo() As Boolean
            Dim returnValue As Boolean = True
            Dim zone1, zone2 As SecurityZone
            Dim zoneIdPerm1, zoneIdPerm2 As ZoneIdentityPermission
            Dim zoneGen1 As New zoneGenerator()
            Dim zoneGen2 As New zoneGenerator()
            zoneGen1.ResetIndex()
            While zoneGen1.CreateZone(zoneIdPerm1, zone1)
                If zoneIdPerm1 Is Nothing Then
                    GoTo ContinueWhile1
                End If
                zoneGen2.ResetIndex()
                Console.WriteLine("********************************************************" & ControlChars.Cr)

                While zoneGen2.CreateZone(zoneIdPerm2, zone2)
                    If zoneIdPerm2 Is Nothing Then
                        GoTo ContinueWhile2
                    End If
                    Try
                        If zoneIdPerm1.IsSubsetOf(zoneIdPerm2) Then
                            Console.WriteLine((zoneIdPerm1.SecurityZone.ToString() & _
                            " is a subset of " & zoneIdPerm2.SecurityZone.ToString()))
                        Else
                            Console.WriteLine((zoneIdPerm1.SecurityZone.ToString() & _
                            " is not a subset of " & zoneIdPerm2.SecurityZone.ToString()))
                        End If
                    Catch e As Exception
                        Console.WriteLine(("An exception was thrown for subset :" & _
                        zoneIdPerm1.ToString() & ControlChars.Cr & zoneIdPerm2.ToString() & _
                        ControlChars.Cr & e.ToString()))
                        returnValue = False
                    End Try
ContinueWhile2:
                End While
ContinueWhile1:
            End While
            Return returnValue
        End Function 'IsSubsetOfDemo

        ' Union creates a new permission that is the union of the current permission and the specified permission.
        Private Function UnionDemo() As Boolean
            Dim returnValue As Boolean = True
            Dim zone1, zone2 As SecurityZone
            Dim zoneIdPerm1, zoneIdPerm2 As ZoneIdentityPermission
            Dim zoneIdPerm3 As IPermission
            Dim zoneGen1 As New zoneGenerator()
            Dim zoneGen2 As New zoneGenerator()
            zoneGen1.ResetIndex()
            While zoneGen1.CreateZone(zoneIdPerm1, zone1)
                If zoneIdPerm1 Is Nothing Then
                    GoTo ContinueWhile1
                End If
                Console.WriteLine("**********************************************************" & ControlChars.Cr)
                zoneGen2.ResetIndex()

                While zoneGen2.CreateZone(zoneIdPerm2, zone2)
                    If zoneIdPerm2 Is Nothing Then
                        GoTo ContinueWhile2
                    End If
                    zoneIdPerm3 = CType(zoneIdPerm1.Union(zoneIdPerm2), ZoneIdentityPermission)
                    zoneIdPerm3 = zoneIdPerm1.Union(zoneIdPerm2)

                    If zoneIdPerm3 Is Nothing Then
                        Console.WriteLine(("The union of " & zone1.ToString() & " and " & _
                        zone2.ToString() & " is null."))
                    Else
                        Console.WriteLine(("The union of " & zoneIdPerm1.SecurityZone.ToString() & " and " _
                        & zoneIdPerm2.SecurityZone.ToString() & " = " _
                        & CType(zoneIdPerm3, Object).SecurityZone.ToString()))
                    End If
ContinueWhile2:
                End While
ContinueWhile1:
            End While


            Return returnValue
        End Function 'UnionDemo

        ' Intersect creates and returns a new permission that is the intersection of the current 
        ' permission and the permission specified.
        Private Function IntersectDemo() As Boolean
            Dim returnValue As Boolean = True
            Dim zone1, zone2 As SecurityZone
            Dim zoneIdPerm1, zoneIdPerm2, zoneIdPerm3 As ZoneIdentityPermission
            Dim zoneGen1 As New zoneGenerator()
            Dim zoneGen2 As New zoneGenerator()
            zoneGen1.ResetIndex()
            While zoneGen1.CreateZone(zoneIdPerm1, zone1)
                If zoneIdPerm1 Is Nothing Then
                    GoTo ContinueWhile1
                End If
                Console.WriteLine("**********************************************************" & ControlChars.Cr)
                zoneGen2.ResetIndex()

                While zoneGen2.CreateZone(zoneIdPerm2, zone2)
                    If zoneIdPerm2 Is Nothing Then
                        GoTo ContinueWhile2
                    End If
                    zoneIdPerm3 = CType(zoneIdPerm1.Intersect(zoneIdPerm2), ZoneIdentityPermission)
                    If Not (zoneIdPerm3 Is Nothing) Then
                        Console.WriteLine(("The intersection of " & zone1.ToString() & " and " & _
                        zone2.ToString() & " = " & CType(zoneIdPerm3, Object).SecurityZone.ToString()))
                    Else
                        Console.WriteLine(("The intersection of " & zone1.ToString() & " and " & _
                        zone2.ToString() & " is null."))
                    End If
ContinueWhile2:
                End While
ContinueWhile1:
            End While

            Return returnValue
        End Function 'IntersectDemo

        'Copy creates and returns an identical copy of the current permission.
        Private Function CopyDemo() As Boolean

            Dim returnValue As Boolean = True

            Dim zone1 As SecurityZone
            Dim zoneIdPerm1, zoneIdPerm2 As ZoneIdentityPermission

            Dim zoneGen1 As New zoneGenerator()
            Dim zoneGen2 As New zoneGenerator()

            zoneGen1.ResetIndex()
            While zoneGen1.CreateZone(zoneIdPerm1, zone1)
                If zoneIdPerm1 Is Nothing Then
                    GoTo ContinueWhile1
                End If
                zoneGen2.ResetIndex()
                Console.WriteLine("********************************************************" & ControlChars.Cr)
                Try
                    zoneIdPerm2 = CType(zoneIdPerm1.Copy(), ZoneIdentityPermission)
                    Console.WriteLine(("Result of copy = " & zoneIdPerm2.ToString()))

                Catch e As Exception
                    Console.WriteLine(("Copy failed :" & zoneIdPerm1.ToString() & e.ToString()))
                    GoTo ContinueWhile1
                End Try
ContinueWhile1:
            End While
            Return returnValue
        End Function 'CopyDemo

        ' 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 Function ToFromXmlDemo() As Boolean

            Dim returnValue As Boolean = True

            Dim zone1 As SecurityZone
            Dim zoneIdPerm1, zoneIdPerm2 As ZoneIdentityPermission
            Dim zoneGen1 As New zoneGenerator()
            Dim zoneGen2 As New zoneGenerator()
            zoneGen1.ResetIndex()
            While zoneGen1.CreateZone(zoneIdPerm1, zone1)
                If zoneIdPerm1 Is Nothing Then
                    GoTo ContinueWhile1
                End If
                Console.WriteLine("********************************************************" & ControlChars.Cr)
                zoneGen2.ResetIndex()
                Try
                    zoneIdPerm2 = New ZoneIdentityPermission(PermissionState.None)
                    zoneIdPerm2.FromXml(zoneIdPerm1.ToXml())
                    Console.WriteLine(("Result of ToFromXml = " & zoneIdPerm2.ToString()))

                Catch e As Exception
                    Console.WriteLine(("ToFromXml failed :" & zoneIdPerm1.ToString() & e.ToString()))
                    GoTo ContinueWhile1
                End Try
ContinueWhile1:
            End While

            Return returnValue
        End Function 'ToFromXmlDemo

        ' Invoke all demos.
        Public Function RunDemo() As Boolean
            Dim returnCode As Boolean = True
            Dim tempReturnCode As Boolean

            ' Call the IsSubsetOf demo.
            If IsSubsetOfDemo() Then
                Console.Out.WriteLine("IsSubsetOf demo completed successfully.")
                tempReturnCode = True
            Else
                Console.Out.WriteLine("IsSubsetOf demo failed.")
                tempReturnCode = False
            End If
            returnCode = tempReturnCode And returnCode

            ' Call the Union demo.
            If UnionDemo() Then
                Console.Out.WriteLine("Union demo completed successfully.")
                tempReturnCode = True
            Else
                Console.Out.WriteLine("Union demo failed.")
                tempReturnCode = False
            End If
            returnCode = tempReturnCode And returnCode

            ' Call the Intersect demo.    
            If IntersectDemo() Then
                Console.Out.WriteLine("Intersect demo completed successfully.")
                tempReturnCode = True
            Else
                Console.Out.WriteLine("Intersect demo failed.")
                tempReturnCode = False
            End If
            returnCode = tempReturnCode And returnCode


            ' Call the Copy demo.    
            If CopyDemo() Then
                Console.Out.WriteLine("Copy demo completed successfully.")
                tempReturnCode = True
            Else
                Console.Out.WriteLine("Copy demo failed.")
                tempReturnCode = False
            End If
            returnCode = tempReturnCode And returnCode

            ' Call the ToFromXml demo.    
            If ToFromXmlDemo() Then
                Console.Out.WriteLine("ToFromXml demo completed successfully.")
                tempReturnCode = True
            Else
                Console.Out.WriteLine("ToFromXml demo failed.")
                tempReturnCode = False
            End If
            returnCode = tempReturnCode And returnCode

            Return returnCode
        End Function

        ' Test harness.
        Public Overloads Shared Sub Main(ByVal args() As [String])
            Try
                Dim democase As New ZoneIdentityDemo()
                Dim returnCode As Boolean = democase.RunDemo()
                If returnCode Then
                    Console.Out.WriteLine("ZoneIdentityPermission demo completed successfully.")
                    Console.Out.WriteLine("Press the Enter key to exit.")
                    Dim consoleInput As String = Console.ReadLine()
                    System.Environment.ExitCode = 100
                Else
                    Console.Out.WriteLine("ZoneIdentityPermission demo failed.")
                    Console.Out.WriteLine("Press the Enter key to exit.")
                    Dim consoleInput As String = Console.ReadLine()
                    System.Environment.ExitCode = 101
                End If
            Catch e As Exception
                Console.Out.WriteLine("ZoneIdentityPermission demo failed.")
                Console.WriteLine(e.ToString())
                Console.Out.WriteLine("Press the Enter key to exit.")
                Dim consoleInput As String = Console.ReadLine()
                System.Environment.ExitCode = 101
            End Try
        End Sub 'Main
    End Class 'ZoneIdentityDemo
 _


    ' This class generates ZoneIdentityPermission objects.
    Friend Class ZoneGenerator


        Private myZone As SecurityZone() = {SecurityZone.NoZone, _
        SecurityZone.Internet, _
        SecurityZone.Intranet, _
        SecurityZone.MyComputer, _
        SecurityZone.Untrusted, _
        SecurityZone.Trusted}

        Private zoneIndex As Integer = 0


        Public Sub New()
            ResetIndex()
        End Sub 'New


        Public Sub ResetIndex()
            zoneIndex = 0
        End Sub 'ResetIndex

        ' CreateZone creates ZoneIdentityPermission objects.
        Public Function CreateZone(ByRef zonePerm As ZoneIdentityPermission, ByRef zone As SecurityZone) As Boolean

            If zoneIndex >= myZone.Length Then
                zonePerm = New ZoneIdentityPermission(PermissionState.None)
                zone = SecurityZone.NoZone
                zoneIndex = zoneIndex + 1
                Return False
            End If
            zone = myZone(zoneIndex)
            zoneIndex = zoneIndex + 1
            Try
                zonePerm = New ZoneIdentityPermission(zone)
                Return True
            Catch e As Exception
                Console.WriteLine(("Cannot create ZoneIdentityPermission: " & zone & " " & e.ToString()))
                zonePerm = New ZoneIdentityPermission(PermissionState.None)
                zone = SecurityZone.NoZone
                Return True
            End Try
        End Function 'CreateZone
    ' End of ZoneGenerator.
End Module

[C#] 
// This sample demonstrates the IsSubsetOf, Union, Intersect, Copy, ToXml and FromXml methods 
// of the ZoneIdentityPermission class.

using System;
using System.Security; 
using System.Security.Permissions; 

[assembly:CLSCompliant(true)]

public class ZoneIdentityDemo
{
// IsSubsetOf determines whether the current permission is a subset of the specified permission.
    private bool IsSubsetOfDemo()
    {
        bool returnValue = true;
        SecurityZone zone1,zone2;
        ZoneIdentityPermission zoneIdPerm1,zoneIdPerm2;
        ZoneGenerator zoneGen1 = new ZoneGenerator();
        ZoneGenerator zoneGen2 = new ZoneGenerator();
        zoneGen1.ResetIndex();
        while(zoneGen1.CreateZone(out zoneIdPerm1, out zone1)) 
        {
            if(zoneIdPerm1 == null) continue;
            zoneGen2.ResetIndex();
            Console.WriteLine("********************************************************\n");

            while(zoneGen2.CreateZone(out zoneIdPerm2, out zone2)) 
            {
                if(zoneIdPerm2 == null) continue;
                try
                {            
                    if (zoneIdPerm1.IsSubsetOf(zoneIdPerm2))
                    {
                        Console.WriteLine(zoneIdPerm1.SecurityZone + " is a subset of " + 
                            zoneIdPerm2.SecurityZone);
                    }
                    else
                    {
                        Console.WriteLine(zoneIdPerm1.SecurityZone + " is not a subset of " + 
                            zoneIdPerm2.SecurityZone);
                    }
                }
                catch(Exception e) 
                {
                    Console.WriteLine("An exception was thrown for subset :" + zoneIdPerm1 + "\n" + 
                        zoneIdPerm2 +"\n" + e);
                    returnValue=false;
                }
            }
        }
        return returnValue;
    }
// Union creates a new permission that is the union of the current permission and the specified permission.
    private bool UnionDemo()
    {
        bool returnValue = true;
        SecurityZone zone1,zone2;
        ZoneIdentityPermission zoneIdPerm1,zoneIdPerm2;
        IPermission zoneIdPerm3;
        ZoneGenerator zoneGen1 = new ZoneGenerator();
        ZoneGenerator zoneGen2 = new ZoneGenerator();
        zoneGen1.ResetIndex();
        while(zoneGen1.CreateZone(out zoneIdPerm1, out zone1)) 
        {
            if(zoneIdPerm1 == null) continue;
            Console.WriteLine("**********************************************************\n");
            zoneGen2.ResetIndex();

            while(zoneGen2.CreateZone(out zoneIdPerm2, out zone2)) 
            {
                if(zoneIdPerm2 == null) continue;
                zoneIdPerm3 = (ZoneIdentityPermission)zoneIdPerm1.Union(zoneIdPerm2);
                zoneIdPerm3 = zoneIdPerm1.Union(zoneIdPerm2);

                if(zoneIdPerm3 == null)  
                {
                    Console.WriteLine("The union of " +  zone1 + " and " + zone2 + " is null." );
                }
                else
                {
                    Console.WriteLine("The union of " + zoneIdPerm1.SecurityZone + " and " + 
                        zoneIdPerm2.SecurityZone + " = " + 
                        ((ZoneIdentityPermission)zoneIdPerm3).SecurityZone.ToString());
                }

            }
        }

        return returnValue;

    }
// Intersect creates and returns a new permission that is the intersection of the current 
// permission and the permission specified.
    private bool IntersectDemo()
    {
        bool returnValue = true;
        SecurityZone zone1,zone2;
        ZoneIdentityPermission zoneIdPerm1,zoneIdPerm2,zoneIdPerm3;
        ZoneGenerator zoneGen1 = new ZoneGenerator();
        ZoneGenerator zoneGen2 = new ZoneGenerator();
        zoneGen1.ResetIndex();
        while(zoneGen1.CreateZone(out zoneIdPerm1, out zone1)) 
        {
            if(zoneIdPerm1 == null) continue;
            Console.WriteLine("**********************************************************\n");
            zoneGen2.ResetIndex();

            while(zoneGen2.CreateZone(out zoneIdPerm2, out zone2)) 
            {
                if(zoneIdPerm2 == null) continue;
    
                zoneIdPerm3 = (ZoneIdentityPermission)zoneIdPerm1.Intersect(zoneIdPerm2);
                if (zoneIdPerm3 != null)
                {
                    Console.WriteLine("The intersection of " + zone1 + " and " + zone2 + " = " + 
                        ((ZoneIdentityPermission)zoneIdPerm3).SecurityZone.ToString());
                }
                else
                {
                    Console.WriteLine("The intersection of " + zone1 + " and " + zone2 + " is null." );
                }
            }
        }

        return returnValue;
    }
//Copy creates and returns an identical copy of the current permission.
    private bool CopyDemo()
    {

        bool returnValue = true;

        SecurityZone zone1;
        ZoneIdentityPermission zoneIdPerm1,zoneIdPerm2;

        ZoneGenerator zoneGen1 = new ZoneGenerator();
        ZoneGenerator zoneGen2 = new ZoneGenerator();

        zoneGen1.ResetIndex();
        while(zoneGen1.CreateZone(out zoneIdPerm1, out zone1)) 
        {
            if(zoneIdPerm1 == null) continue;
            zoneGen2.ResetIndex();
            Console.WriteLine("********************************************************\n");
            try
            {            
                zoneIdPerm2 = (ZoneIdentityPermission)zoneIdPerm1.Copy();
                Console.WriteLine("Result of copy = " + zoneIdPerm2.ToString());

            }
            catch(Exception e) 
            {
                Console.WriteLine("Copy failed :" + zoneIdPerm1.ToString() + 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 bool ToFromXmlDemo()
    {

        bool returnValue = true;

        SecurityZone zone1;
        ZoneIdentityPermission zoneIdPerm1,zoneIdPerm2;
        ZoneGenerator zoneGen1 = new ZoneGenerator();
        ZoneGenerator zoneGen2 = new ZoneGenerator();
        zoneGen1.ResetIndex();
        while(zoneGen1.CreateZone(out zoneIdPerm1, out zone1)) 
        {
            if(zoneIdPerm1 == null) continue;
            Console.WriteLine("********************************************************\n");
            zoneGen2.ResetIndex();
        try
            {            
                zoneIdPerm2= new ZoneIdentityPermission(PermissionState.None);
                zoneIdPerm2.FromXml(zoneIdPerm1.ToXml());
                Console.WriteLine("Result of ToFromXml = " +
                    zoneIdPerm2.ToString());
    
            }
            catch(Exception e) 
            {
                Console.WriteLine("ToFromXml failed :" + zoneIdPerm1.ToString() + e);
                continue;
            }
        }

        return returnValue;

    }
// Invoke all demos.
    public bool RunDemo()
    {
        bool returnCode = true;
        bool tempReturnCode;

        // Call the IsSubsetOf demo.
        if(tempReturnCode= IsSubsetOfDemo())Console.Out.WriteLine("IsSubsetOf demo completed successfully.");
        else Console.Out.WriteLine("IsSubsetOf demo failed.");
        returnCode=tempReturnCode && returnCode;

        // Call the Union demo.
        if(tempReturnCode= UnionDemo())Console.Out.WriteLine("Union demo completed successfully.");
        else Console.Out.WriteLine("Union demo failed.");
        returnCode=tempReturnCode && returnCode;

        // Call the Intersect demo.    
        if(tempReturnCode= IntersectDemo())Console.Out.WriteLine("Intersect demo completed successfully.");
        else Console.Out.WriteLine("Intersect demo failed.");
        returnCode=tempReturnCode && returnCode;


        // Call the Copy demo.    
        if(tempReturnCode= CopyDemo())Console.Out.WriteLine("Copy demo completed successfully.");
        else Console.Out.WriteLine("Copy demo failed.");
        returnCode=tempReturnCode && returnCode;

        // Call the ToFromXml demo.    
        if(tempReturnCode= ToFromXmlDemo())Console.Out.WriteLine("ToFromXml demo completed successfully.");
        else Console.Out.WriteLine("ToFromXml demo failed.");
        returnCode=tempReturnCode && returnCode;

        return (  returnCode );    
    }
// Test harness.
    public static void Main(String[] args) 
    {
        try
        {
            ZoneIdentityDemo democase = new ZoneIdentityDemo();
            bool returnCode = democase.RunDemo();
            if (returnCode)
            {
                Console.Out.WriteLine("ZoneIdentityPermission demo completed successfully.");
                Console.Out.WriteLine("Press the Enter key to exit.");
                string consoleInput = Console.ReadLine();
                System.Environment.ExitCode = 100;
            }
            else
            {
                Console.Out.WriteLine("ZoneIdentityPermission demo failed.");
                Console.Out.WriteLine("Press the Enter key to exit.");
                string consoleInput = Console.ReadLine();
                System.Environment.ExitCode = 101;
            }
        }
        catch(Exception e)
        {
            Console.Out.WriteLine("ZoneIdentityPermission demo failed.");
            Console.WriteLine(e.ToString());
            Console.Out.WriteLine("Press the Enter key to exit.");
            string consoleInput = Console.ReadLine();
            System.Environment.ExitCode = 101;
        }
    }
}


// This class generates ZoneIdentityPermission objects.

internal  class ZoneGenerator
{


    private SecurityZone[] myZone = 
{SecurityZone.NoZone,SecurityZone.Internet,SecurityZone.Intranet,SecurityZone.MyComputer,SecurityZone.Untrusted,SecurityZone.Trusted};

    private int zoneIndex = 0;

    public ZoneGenerator()
    {
        ResetIndex();
    }

    public void ResetIndex()
    {
        zoneIndex = 0;
    }
// CreateZone creates ZoneIdentityPermission objects.
    public bool CreateZone(out ZoneIdentityPermission zonePerm, out SecurityZone zone)
    {

        if(zoneIndex >= myZone.Length) 
        {
            zonePerm = new ZoneIdentityPermission(PermissionState.None);
            zone=SecurityZone.NoZone;
            zoneIndex++;
            return false;
        }
        zone = myZone[zoneIndex++];
        try
        {
            zonePerm = new ZoneIdentityPermission(zone);
            return true;
        } 
        catch(Exception e)
        {
            Console.WriteLine("Cannot create ZoneIdentityPermission: " + zone +" "+e);
            zonePerm = new ZoneIdentityPermission(PermissionState.None);
            zone=SecurityZone.NoZone;
            return true;
        }
    }
} // End of ZoneGenerator.

[C++] 
// This sample demonstrates the IsSubsetOf, Union, Intersect, Copy, ToXml and FromXml methods
// of the ZoneIdentityPermission class.

#using <mscorlib.dll>

using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::Runtime::InteropServices;

[assembly:CLSCompliant(true)];

// This class generates ZoneIdentityPermission objects.
__gc class ZoneGenerator {
private:
   SecurityZone myZone[];
   int  zoneIndex;

public:
   ZoneGenerator() {
      SecurityZone temp[] = {SecurityZone::NoZone, SecurityZone::Internet, SecurityZone::Intranet, SecurityZone::MyComputer, SecurityZone::Untrusted, SecurityZone::Trusted};
      myZone = temp;
      ResetIndex();
   };

   void ResetIndex() {
      zoneIndex = 0;
   };

   // CreateZone creates ZoneIdentityPermission objects.
public:
   bool CreateZone([Out] ZoneIdentityPermission** zonePerm, [Out] SecurityZone* zone) {

      if (zoneIndex >= myZone->Length) {
         *zonePerm = new ZoneIdentityPermission(PermissionState::None);
         *zone=SecurityZone::NoZone;
         zoneIndex++;
         return false;
      };
      *zone = myZone[zoneIndex++];
      try {
         *zonePerm = new ZoneIdentityPermission(*zone);
         return true;
      } catch (Exception* e) {
         Console::WriteLine(S"Cannot create ZoneIdentityPermission: {0} {1}", __box(*zone), e);
         *zonePerm = new ZoneIdentityPermission(PermissionState::None);
         *zone=SecurityZone::NoZone;
         return false;
      };
   };
}; // End of ZoneGenerator.

public __gc class ZoneIdentityDemo {
   // IsSubsetOf determines whether the current permission is a subset of the specified permission.
private:
   bool IsSubsetOfDemo() {
      bool returnValue = true;
      SecurityZone zone1, zone2;
      ZoneIdentityPermission* zoneIdPerm1, * zoneIdPerm2;
      ZoneGenerator* zoneGen1 = new ZoneGenerator();
      ZoneGenerator* zoneGen2 = new ZoneGenerator();
      zoneGen1->ResetIndex();
      while(zoneGen1->CreateZone(&zoneIdPerm1, &zone1)) {
         if (zoneIdPerm1 == 0) continue;
         zoneGen2->ResetIndex();
         Console::WriteLine(S"********************************************************\n");

         while(zoneGen2->CreateZone(&zoneIdPerm2, &zone2)) {
            if (zoneIdPerm2 == 0) continue;
            try {
               if (zoneIdPerm1->IsSubsetOf(zoneIdPerm2)) {
                  Console::WriteLine(S"{0} is a subset of {1}",
                     __box(zoneIdPerm1->SecurityZone), __box(zoneIdPerm2->SecurityZone));
               } else {
                  Console::WriteLine(S"{0} is not a subset of {1}",
                     __box(zoneIdPerm1->SecurityZone), __box(zoneIdPerm2->SecurityZone));
               }
            } catch (Exception* e) {
               Console::WriteLine(S"An exception was thrown for subset : {0}\n{1}\n{2}",
                  zoneIdPerm1, zoneIdPerm2, e);
               returnValue=false;
            }
         }
      }
      return returnValue;
   }

   // Union creates a new permission that is the union of the current permission and the specified permission.
private:
   bool UnionDemo() {
      bool returnValue = true;
      SecurityZone zone1, zone2;
      ZoneIdentityPermission* zoneIdPerm1, *zoneIdPerm2;
      IPermission* zoneIdPerm3;
      ZoneGenerator* zoneGen1 = new ZoneGenerator();
      ZoneGenerator* zoneGen2 = new ZoneGenerator();
      zoneGen1->ResetIndex();
      while(zoneGen1->CreateZone(&zoneIdPerm1, &zone1)) {
         if (zoneIdPerm1 == 0) continue;
         Console::WriteLine(S"**********************************************************\n");
         zoneGen2->ResetIndex();

         while(zoneGen2->CreateZone(&zoneIdPerm2, &zone2)) {
            if (zoneIdPerm2 == 0) continue;
            zoneIdPerm3 = zoneIdPerm1->Union(zoneIdPerm2);

            if (zoneIdPerm3 == 0) {
               Console::WriteLine(S"The union of {0} and {1} is null.",
                  __box(zone1), __box(zone2));
            } else {
               Console::WriteLine(S"The union of {0} and {1} = {2}",
                  __box(zoneIdPerm1->SecurityZone), __box(zoneIdPerm2->SecurityZone),
                  __box((dynamic_cast<ZoneIdentityPermission*>(zoneIdPerm3))->SecurityZone));
            }
         }
      }
      return returnValue;
   }

   // Intersect creates and returns a new permission that is the intersection of the current
   // permission and the permission specified.
private:
   bool IntersectDemo() {
      bool returnValue = true;
      SecurityZone zone1, zone2;
      ZoneIdentityPermission* zoneIdPerm1, *zoneIdPerm2, *zoneIdPerm3;
      ZoneGenerator* zoneGen1 = new ZoneGenerator();
      ZoneGenerator* zoneGen2 = new ZoneGenerator();
      zoneGen1->ResetIndex();
      while(zoneGen1->CreateZone(&zoneIdPerm1, &zone1)) {
         if (zoneIdPerm1 == 0) continue;
         Console::WriteLine(S"**********************************************************\n");
         zoneGen2->ResetIndex();

         while(zoneGen2->CreateZone(&zoneIdPerm2, &zone2)) {
            if (zoneIdPerm2 == 0) continue;

            zoneIdPerm3 = dynamic_cast<ZoneIdentityPermission*>(zoneIdPerm1->Intersect(zoneIdPerm2));
            if (zoneIdPerm3 != 0) {
               Console::WriteLine(S"The intersection of {0} and {1} = {2}", __box(zone1),
                  __box(zone2),
                  __box((dynamic_cast<ZoneIdentityPermission*>(zoneIdPerm3))->SecurityZone));
            } else {
               Console::WriteLine(S"The intersection of {0} and {1} is null.", __box(zone1), __box(zone2));
            }
         }
      }
      return returnValue;
   }
   //Copy creates and returns an identical copy of the current permission.
private:
   bool CopyDemo() {

      bool returnValue = true;

      SecurityZone zone1;
      ZoneIdentityPermission* zoneIdPerm1, *zoneIdPerm2;

      ZoneGenerator* zoneGen1 = new ZoneGenerator();
      ZoneGenerator* zoneGen2 = new ZoneGenerator();

      zoneGen1->ResetIndex();
      while(zoneGen1->CreateZone(&zoneIdPerm1, &zone1)) {
         if (zoneIdPerm1 == 0) continue;
         zoneGen2->ResetIndex();
         Console::WriteLine(S"********************************************************\n");
         try {
            zoneIdPerm2 = dynamic_cast<ZoneIdentityPermission*>(zoneIdPerm1->Copy());
            Console::WriteLine(S"Result of copy = {0}", zoneIdPerm2);
         } catch (Exception* e) {
            Console::WriteLine(S"Copy failed : {0}{1}", zoneIdPerm1, 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:
   bool ToFromXmlDemo() {

      bool returnValue = true;

      SecurityZone zone1;
      ZoneIdentityPermission* zoneIdPerm1, *zoneIdPerm2;
      ZoneGenerator* zoneGen1 = new ZoneGenerator();
      ZoneGenerator* zoneGen2 = new ZoneGenerator();
      zoneGen1->ResetIndex();
      while(zoneGen1->CreateZone(&zoneIdPerm1, &zone1)) {
         if (zoneIdPerm1 == 0) continue;
         Console::WriteLine(S"********************************************************\n");
         zoneGen2->ResetIndex();
         try {
            zoneIdPerm2 = new ZoneIdentityPermission(PermissionState::None);
            zoneIdPerm2->FromXml(zoneIdPerm1->ToXml());
            Console::WriteLine(S"Result of ToFromXml = {0}", zoneIdPerm2);
         } catch (Exception* e) {
            Console::WriteLine(S"ToFromXml failed : {0}{1}", zoneIdPerm1, e);
            continue;
         }
      }

      return returnValue;

   }
   // Invoke all demos.
public:
   bool RunDemo() {
      bool returnCode = true;
      bool tempReturnCode;

      // Call the IsSubsetOf demo.
      if (tempReturnCode= IsSubsetOfDemo())
         Console::WriteLine(S"IsSubsetOf demo completed successfully.");
      else
         Console::WriteLine(S"IsSubsetOf demo failed.");
      returnCode=tempReturnCode && returnCode;
      // Call the Union demo.
      if (tempReturnCode= UnionDemo())
         Console::WriteLine(S"Union demo completed successfully.");
      else
         Console::WriteLine(S"Union demo failed.");
      returnCode=tempReturnCode && returnCode;

      // Call the Intersect demo.
      if (tempReturnCode= IntersectDemo())
         Console::WriteLine(S"Intersect demo completed successfully.");
      else
         Console::WriteLine(S"Intersect demo failed.");
      returnCode=tempReturnCode && returnCode;

      // Call the Copy demo.
      if (tempReturnCode= CopyDemo())
         Console::WriteLine(S"Copy demo completed successfully.");
      else
         Console::WriteLine(S"Copy demo failed.");
      returnCode=tempReturnCode && returnCode;

      // Call the ToFromXml demo.
      if (tempReturnCode= ToFromXmlDemo())
         Console::WriteLine(S"ToFromXml demo completed successfully.");
      else
         Console::WriteLine(S"ToFromXml demo failed.");
      returnCode=tempReturnCode && returnCode;

      return (returnCode);
   }
};

// Test harness.
int main() {
   try {
      ZoneIdentityDemo* democase = new ZoneIdentityDemo();
      bool returnCode = democase->RunDemo();
      if (returnCode) {
         Console::WriteLine(S"ZoneIdentityPermission demo completed successfully.");
         Console::WriteLine(S"Press the Enter key to exit.");
         Console::ReadLine();
         System::Environment::ExitCode = 100;
      } else {
         Console::WriteLine(S"ZoneIdentityPermission demo failed.");
         Console::WriteLine(S"Press the Enter key to exit.");
         Console::ReadLine();
         System::Environment::ExitCode = 101;
      }
   } catch (Exception* e) {
      Console::WriteLine(S"ZoneIdentityPermission demo failed.");
      Console::WriteLine(e);
      Console::WriteLine(S"Press the Enter key to exit.");
      Console::ReadLine();
      System::Environment::ExitCode = 101;
   }
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Security.Permissions

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: Mscorlib (in Mscorlib.dll)

See Also

ZoneIdentityPermission Members | System.Security.Permissions Namespace | Permissions | Requesting Permissions | ZoneIdentityPermissionAttribute | Zone | ZoneMembershipCondition

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