FileCodeGroup 類別

定義

命名空間:

System.Security.Policy

組件:

System.Security.Permissions.dll

套件:

System.Security.Permissions v9.0.0-rc.2.24473.5

來源:

FileCodeGroup.cs

警告

Code Access Security is not supported or honored by the runtime.

將許可權授與程式代碼元件中位於程式代碼元件中的檔案，以將符合成員資格條件的程式代碼元件授與許可權。 無法繼承這個類別。

public ref class FileCodeGroup sealed : System::Security::Policy::CodeGroup

[System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class FileCodeGroup : System.Security.Policy.CodeGroup

[<System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type FileCodeGroup = class
    inherit CodeGroup

Public NotInheritable Class FileCodeGroup
Inherits CodeGroup

繼承

Object

CodeGroup

FileCodeGroup

屬性

ObsoleteAttribute

範例

下列範例示範如何使用 FileCodeGroup 類別的成員。

using namespace System;
using namespace System::Security;
using namespace System::Security::Policy;
using namespace System::Security::Permissions;
using namespace System::Reflection;

ref class Members
{
public:
   [STAThread]
   static void Main()
   {
      FileCodeGroup^ fileCodeGroup = constructDefaultGroup();
      
      // Create a deep copy of the FileCodeGroup.
      FileCodeGroup^ copyCodeGroup =
         dynamic_cast<FileCodeGroup^>(fileCodeGroup->Copy());

      CompareTwoCodeGroups( fileCodeGroup, copyCodeGroup );
      addPolicy(  &fileCodeGroup );
      addXmlMember(  &fileCodeGroup );
      updateMembershipCondition(  &fileCodeGroup );
      addChildCodeGroup(  &fileCodeGroup );
      Console::Write( L"Comparing the resolved code group " );
      Console::WriteLine( L"with the initial code group." );
      FileCodeGroup^ resolvedCodeGroup =
         ResolveGroupToEvidence( fileCodeGroup );
      if ( CompareTwoCodeGroups( fileCodeGroup, resolvedCodeGroup ) )
      {
         PrintCodeGroup( resolvedCodeGroup );
      }
      else
      {
         PrintCodeGroup( fileCodeGroup );
      }

      Console::WriteLine( L"This sample completed successfully; press Enter to exit." );
      Console::ReadLine();
   }

private:
   // Construct a new FileCodeGroup with Read, Write, Append
   // and PathDiscovery access.
   static FileCodeGroup^ constructDefaultGroup()
   {
      // Construct a new file code group that has complete access to
      // files in the specified path.
      FileCodeGroup^ fileCodeGroup = gcnew FileCodeGroup(
         gcnew AllMembershipCondition,FileIOPermissionAccess::AllAccess );

      // Set the name of the file code group.
      fileCodeGroup->Name = L"TempCodeGroup";

      // Set the description of the file code group.
      fileCodeGroup->Description = L"Temp folder permissions group";

      // Retrieve the string representation of the  fileCodeGroup�s
      // attributes. FileCodeGroup does not use AttributeString, so the
      // value should be null.
      if ( fileCodeGroup->AttributeString != nullptr )
      {
         throw gcnew NullReferenceException(
            L"The AttributeString property should be null." );
      }

      return fileCodeGroup;
   }

   // Add file permission to restrict write access to all files on the
   // local machine.
   static void addPolicy( interior_ptr<FileCodeGroup^> fileCodeGroup )
   {
      // Set the PolicyStatement property to a policy with read access to
      // the root directory of drive C.
      FileIOPermission^ rootFilePermissions =
         gcnew FileIOPermission( PermissionState::None );
      rootFilePermissions->AllLocalFiles =
         FileIOPermissionAccess::Read;
      rootFilePermissions->SetPathList(
         FileIOPermissionAccess::Read, L"C:\\" );
      NamedPermissionSet^ namedPermissions =
         gcnew NamedPermissionSet( L"RootPermissions" );
      namedPermissions->AddPermission( rootFilePermissions );
      ( *fileCodeGroup )->PolicyStatement =
         gcnew PolicyStatement( namedPermissions );
   }

   // Set the membership condition of the specified FileCodeGroup
   // to the Intranet zone.
   static void updateMembershipCondition( interior_ptr<FileCodeGroup^> fileCodeGroup )
   {
      ZoneMembershipCondition^ zoneCondition =
         gcnew ZoneMembershipCondition( SecurityZone::Intranet );
      ( *fileCodeGroup )->MembershipCondition = zoneCondition;
   }

   // Add a child group with read-access file permission to the specified
   // code group.
   static void addChildCodeGroup( interior_ptr<FileCodeGroup^> fileCodeGroup )
   {
      // Create a file code group with read-access permission.
      FileCodeGroup^ tempFolderCodeGroup = gcnew FileCodeGroup(
         gcnew AllMembershipCondition,FileIOPermissionAccess::Read );
      
      // Set the name of the child code group and add it to
      // the specified code group.
      tempFolderCodeGroup->Name = L"Read-only group";
      ( *fileCodeGroup )->AddChild( tempFolderCodeGroup );
   }

   // Compare the two specified file code groups for equality.
   static bool CompareTwoCodeGroups( FileCodeGroup^ firstCodeGroup,
      FileCodeGroup^ secondCodeGroup )
   {
      if ( firstCodeGroup->Equals( secondCodeGroup ) )
      {
         Console::WriteLine( L"The two code groups are equal." );
         return true;
      }
      else
      {
         Console::WriteLine( L"The two code groups are not equal." );
         return false;
      }
   }

   // Retrieve the resolved policy based on Evidence from the executing
   // assembly found in the specified code group.
   static String^ ResolveEvidence( CodeGroup^ fileCodeGroup )
   {
      String^ policyString = L"";
      
      // Resolve the policy based on evidence in the executing assembly.
      Assembly^ assembly = Members::typeid->Assembly;
      Evidence^ executingEvidence = assembly->Evidence;
      PolicyStatement^ policy = fileCodeGroup->Resolve( executingEvidence );

      if ( policy != nullptr )
      {
         policyString = policy->ToString();
      }

      return policyString;
   }

   // Retrieve the resolved code group based on the Evidence from
   // the executing assembly found in the specified code group.
   static FileCodeGroup^ ResolveGroupToEvidence( FileCodeGroup^ fileCodeGroup )
   {
      // Resolve matching code groups to the executing assembly.
      Assembly^ assembly = Members::typeid->Assembly;
      Evidence^ evidence = assembly->Evidence;
      CodeGroup^ codeGroup = fileCodeGroup->ResolveMatchingCodeGroups( evidence );

      return dynamic_cast<FileCodeGroup^>(codeGroup);
   }

   // If a domain attribute is not found in the specified FileCodeGroup,
   // add a child XML element identifying a custom membership condition.
   static void addXmlMember( interior_ptr<FileCodeGroup^> fileCodeGroup )
   {
      SecurityElement^ xmlElement = ( *fileCodeGroup )->ToXml();

      SecurityElement^ rootElement = gcnew SecurityElement( L"CodeGroup" );
      if ( xmlElement->Attribute(L"domain") == nullptr )
      {
         SecurityElement^ newElement = gcnew SecurityElement(
            L"CustomMembershipCondition" );
         newElement->AddAttribute( L"class", L"CustomMembershipCondition" );
         newElement->AddAttribute( L"version", L"1" );
         newElement->AddAttribute( L"domain", L"contoso.com" );
         rootElement->AddChild( newElement );
         ( *fileCodeGroup )->FromXml( rootElement );
      }

      Console::WriteLine( L"Added a custom membership condition:" );
      Console::WriteLine( rootElement );
   }

   // Print the properties of the specified code group to the console.
   static void PrintCodeGroup( CodeGroup^ codeGroup )
   {
      // Compare the type of the specified object with the FileCodeGroup
      // type.
      if (  !codeGroup->GetType()->Equals( FileCodeGroup::typeid ) )
      {
         throw gcnew ArgumentException( L"Expected the FileCodeGroup type." );
      }

      String^ codeGroupName = codeGroup->Name;
      String^ membershipCondition = codeGroup->MembershipCondition->ToString();
      
      String^ permissionSetName = codeGroup->PermissionSetName;

      int hashCode = codeGroup->GetHashCode();

      String^ mergeLogic = L"";
      
      if ( codeGroup->MergeLogic->Equals( L"Union" ) )
      {
         mergeLogic = L" with Union merge logic";
      }
      
      // Retrieve the class path for FileCodeGroup.
      String^ fileGroupClass = codeGroup->ToString();
      
      // Write summary to the console window.
      Console::WriteLine( L"\n*** {0} summary ***", fileGroupClass );
      Console::Write( L"A FileCodeGroup named " );
      Console::Write( L"{0}{1}", codeGroupName, mergeLogic );
      Console::Write( L" has been created with hash code{0}.", hashCode );
      Console::Write( L"This code group contains a {0}", membershipCondition );
      Console::Write( L" membership condition with the " );
      Console::Write( L"{0} permission set. ", permissionSetName );
      Console::Write( L"The code group has the following security policy: " );
      Console::WriteLine( ResolveEvidence( codeGroup ) );
      int childCount = codeGroup->Children->Count;
      if ( childCount > 0 )
      {
         Console::Write( L"There are {0}", childCount );
         Console::WriteLine( L" child code groups in this code group." );
         
         // Iterate through the child code groups to display their names
         // and remove them from the specified code group.
         for ( int i = 0; i < childCount; i++ )
         {
            // Get child code group as type FileCodeGroup.
            FileCodeGroup^ childCodeGroup =
               dynamic_cast<FileCodeGroup^>(codeGroup->Children->default[ i ]);
            
            Console::Write( L"Removing the {0}.", childCodeGroup->Name );
            // Remove child code group.

            codeGroup->RemoveChild( childCodeGroup );
         }
         Console::WriteLine();
      }
      else
      {
         Console::Write( L"There are no child code groups" );
         Console::WriteLine( L" in this code group." );
      }
   }
};

int main()
{
   Members::Main();
}

//
// This sample produces the following output:
//
// The two code groups are equal.
// Added a custom membership condition:
// <CustomMembershipCondition class="CustomMembershipCondition"
//                                version="1"
//                                domain="contoso.com"/>
// Comparing the resolved code group with the initial code group.
// The two code groups are not equal.
//
// *** System.Security.Policy.FileCodeGroup summary ***
// A FileCodeGroup named  with Union merge logic has been created with hash
// code 113151473. This code group contains a Zone - Intranet membership
// condition with the Same directory FileIO - NoAccess permission set. The
// code group has the following security policy:
// There are 1 child code groups in this code group.
// Removing the Read-only group.
// This sample completed successfully; press Enter to exit.

using System;
using System.Security;
using System.Security.Policy;
using System.Security.Permissions;
using System.Reflection;

class Members
{
    [STAThread]
    static void Main(string[] args)
    {
        FileCodeGroup fileCodeGroup = constructDefaultGroup();
        
        // Create a deep copy of the FileCodeGroup.
        FileCodeGroup copyCodeGroup = (FileCodeGroup)fileCodeGroup.Copy();

        CompareTwoCodeGroups(fileCodeGroup, copyCodeGroup);

        addPolicy(ref fileCodeGroup);
        addXmlMember(ref fileCodeGroup);
        updateMembershipCondition(ref fileCodeGroup);
        addChildCodeGroup(ref fileCodeGroup);

        Console.Write("Comparing the resolved code group ");
        Console.WriteLine("with the initial code group.");
        FileCodeGroup resolvedCodeGroup =
            ResolveGroupToEvidence(fileCodeGroup);
        if (CompareTwoCodeGroups(fileCodeGroup, resolvedCodeGroup))
        {
            PrintCodeGroup(resolvedCodeGroup);
        }
        else
        {
            PrintCodeGroup(fileCodeGroup);
        }
        
        Console.WriteLine("This sample completed successfully; " +
            "press Enter to exit.");
        Console.ReadLine();
    }

    // Construct a new FileCodeGroup with Read, Write, Append 
    // and PathDiscovery access.
    private static FileCodeGroup constructDefaultGroup()
    {
        // Construct a new file code group that has complete access to
        // files in the specified path.
        FileCodeGroup fileCodeGroup = 
            new FileCodeGroup(
            new AllMembershipCondition(),
            FileIOPermissionAccess.AllAccess);

        // Set the name of the file code group.
        fileCodeGroup.Name = "TempCodeGroup";

        // Set the description of the file code group.
        fileCodeGroup.Description = "Temp folder permissions group";

        // Retrieve the string representation of the  fileCodeGroup’s 
        // attributes. FileCodeGroup does not use AttributeString, so the
        // value should be null.
        if (fileCodeGroup.AttributeString != null)
        {
            throw new NullReferenceException(
                "The AttributeString property should be null.");
        }

        return fileCodeGroup;
    }

    // Add file permission to restrict write access to all files on the
    // local machine.
    private static void addPolicy(ref FileCodeGroup fileCodeGroup)
    {
        // Set the PolicyStatement property to a policy with read access to
        // the root directory of drive C.
        FileIOPermission rootFilePermissions = 
            new FileIOPermission(PermissionState.None);
        rootFilePermissions.AllLocalFiles = FileIOPermissionAccess.Read;
        rootFilePermissions.SetPathList(FileIOPermissionAccess.Read,"C:\\");

        NamedPermissionSet namedPermissions =
            new NamedPermissionSet("RootPermissions");
        namedPermissions.AddPermission(rootFilePermissions);
        
        fileCodeGroup.PolicyStatement =
            new PolicyStatement(namedPermissions);
    }

    // Set the membership condition of the specified FileCodeGroup 
    // to the Intranet zone.
    private static void updateMembershipCondition(
        ref FileCodeGroup fileCodeGroup)
    {
        ZoneMembershipCondition zoneCondition =
            new ZoneMembershipCondition(SecurityZone.Intranet);
        fileCodeGroup.MembershipCondition = zoneCondition;
    }

    // Add a child group with read-access file permission to the specified 
    // code group.
    private static void addChildCodeGroup(ref FileCodeGroup fileCodeGroup)
    {
        // Create a file code group with read-access permission.
        FileCodeGroup tempFolderCodeGroup = new FileCodeGroup(
            new AllMembershipCondition(), 
            FileIOPermissionAccess.Read);

        // Set the name of the child code group and add it to 
        // the specified code group.
        tempFolderCodeGroup.Name = "Read-only group";
        fileCodeGroup.AddChild(tempFolderCodeGroup);
    }

    // Compare the two specified file code groups for equality.
    private static bool CompareTwoCodeGroups(
        FileCodeGroup firstCodeGroup, FileCodeGroup secondCodeGroup)
    {
        if (firstCodeGroup.Equals(secondCodeGroup))
        {
            Console.WriteLine("The two code groups are equal.");
            return true;
        }
        else 
        {
            Console.WriteLine("The two code groups are not equal.");
            return false;
        }
    }

    // Retrieve the resolved policy based on Evidence from the executing 
    // assembly found in the specified code group.
    private static string ResolveEvidence(CodeGroup fileCodeGroup)
    {
        string policyString = "";

        // Resolve the policy based on evidence in the executing assembly.
        Assembly assembly = typeof(Members).Assembly;
        Evidence executingEvidence = assembly.Evidence;

        PolicyStatement policy = fileCodeGroup.Resolve(executingEvidence);

        if (policy != null)
        {
            policyString = policy.ToString();
        }

        return policyString;
    }

    // Retrieve the resolved code group based on the Evidence from 
    // the executing assembly found in the specified code group.
    private static FileCodeGroup ResolveGroupToEvidence(
        FileCodeGroup fileCodeGroup)
    {
        // Resolve matching code groups to the executing assembly.
        Assembly assembly = typeof(Members).Assembly;
        Evidence evidence = assembly.Evidence;
        CodeGroup codeGroup = 
            fileCodeGroup.ResolveMatchingCodeGroups(evidence);

        return (FileCodeGroup)codeGroup;
    }

    // If a domain attribute is not found in the specified FileCodeGroup,
    // add a child XML element identifying a custom membership condition.
    private static void addXmlMember(ref FileCodeGroup fileCodeGroup)
    {
        SecurityElement xmlElement = fileCodeGroup.ToXml();

        SecurityElement rootElement = new SecurityElement("CodeGroup");

        if (xmlElement.Attribute("domain") == null) 
        {
            SecurityElement newElement = 
                new SecurityElement("CustomMembershipCondition");
            newElement.AddAttribute("class","CustomMembershipCondition");
            newElement.AddAttribute("version","1");
            newElement.AddAttribute("domain","contoso.com");

            rootElement.AddChild(newElement);

            fileCodeGroup.FromXml(rootElement);
        }

        Console.WriteLine("Added a custom membership condition:");
        Console.WriteLine(rootElement.ToString());
    }

    // Print the properties of the specified code group to the console.
    private static void PrintCodeGroup(CodeGroup codeGroup)
    {
        // Compare the type of the specified object with the FileCodeGroup
        // type.
        if (!codeGroup.GetType().Equals(typeof(FileCodeGroup)))
        {
            throw new ArgumentException("Expected the FileCodeGroup type.");
        }
        
        string codeGroupName = codeGroup.Name;
        string membershipCondition = codeGroup.MembershipCondition.ToString();
        string permissionSetName = codeGroup.PermissionSetName;

        int hashCode = codeGroup.GetHashCode();

        string mergeLogic = "";
        if (codeGroup.MergeLogic.Equals("Union"))
        {
            mergeLogic = " with Union merge logic";
        }

        // Retrieve the class path for FileCodeGroup.
        string fileGroupClass = codeGroup.ToString();

        // Write summary to the console window.
        Console.WriteLine("\n*** " + fileGroupClass + " summary ***");
        Console.Write("A FileCodeGroup named ");
        Console.Write(codeGroupName + mergeLogic);
        Console.Write(" has been created with hash code" + hashCode + ".");
        Console.Write("This code group contains a " + membershipCondition);
        Console.Write(" membership condition with the ");
        Console.Write(permissionSetName + " permission set. ");

        Console.Write("The code group has the following security policy: ");
        Console.WriteLine(ResolveEvidence(codeGroup));

        int childCount = codeGroup.Children.Count;
        if (childCount > 0 )
        {
            Console.Write("There are " + childCount);
            Console.WriteLine(" child code groups in this code group.");

            // Iterate through the child code groups to display their names
            // and remove them from the specified code group.
            for (int i=0; i < childCount; i++)
            {
                // Get child code group as type FileCodeGroup.
                FileCodeGroup childCodeGroup = 
                    (FileCodeGroup)codeGroup.Children[i];
                
                Console.Write("Removing the " + childCodeGroup.Name + ".");
                // Remove child code group.
                codeGroup.RemoveChild(childCodeGroup);
            }

            Console.WriteLine();
        }
        else
        {
            Console.Write("There are no child code groups");
            Console.WriteLine(" in this code group.");
        }
    }
}
//
// This sample produces the following output:
//
// The two code groups are equal.
// Added a custom membership condition:
// <CustomMembershipCondition class="CustomMembershipCondition"
//                                version="1"
//                                domain="contoso.com"/>
// Comparing the resolved code group with the initial code group.
// The two code groups are not equal.
// 
// *** System.Security.Policy.FileCodeGroup summary ***
// A FileCodeGroup named  with Union merge logic has been created with hash
// code 113151473. This code group contains a Zone - Intranet membership
// condition with the Same directory FileIO - NoAccess permission set. The
// code group has the following security policy:
// There are 1 child code groups in this code group.
// Removing the Read-only group.
// This sample completed successfully; press Enter to exit.

Imports System.Security
Imports System.Security.Policy
Imports System.Security.Permissions
Imports System.Reflection
Imports System.Windows.Forms

Public Class Form1
    Inherits System.Windows.Forms.Form

    ' Event handler for Run button.
    Private Sub Button1_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click

        tbxOutput.Cursor = Cursors.WaitCursor
        tbxOutput.Text = ""

        Dim fileCodeGroup As FileCodeGroup = constructDefaultGroup()

        ' Create a deep copy of the FileCodeGroup;
        Dim copyCodeGroup As FileCodeGroup = _
            CType(fileCodeGroup.Copy(), FileCodeGroup)

        CompareTwoCodeGroups(fileCodeGroup, copyCodeGroup)

        addPolicy(fileCodeGroup)
        addXmlMember(fileCodeGroup)
        updateMembershipCondition(fileCodeGroup)
        addChildCodeGroup(fileCodeGroup)

        WriteLine("Comparing the resolved code group with the initial " + _
            "code group:")
        Dim resolvedCodeGroup As FileCodeGroup
        resolvedCodeGroup = ResolveGroupToEvidence(fileCodeGroup)

        If (CompareTwoCodeGroups(fileCodeGroup, resolvedCodeGroup)) Then
            PrintCodeGroup(resolvedCodeGroup)
        Else
            PrintCodeGroup(fileCodeGroup)
        End If

        ' Reset the cursor and conclude application.
        tbxOutput.AppendText(vbCrLf + "This sample completed " + _
            "successfully; press Exit to continue.")
        tbxOutput.Cursor = Cursors.Default
    End Sub
    ' Construct a new FileCodeGroup with read, write, append and 
    ' discovery access.
    Private Function constructDefaultGroup() As FileCodeGroup
        ' Construct a file code group with read, write, append and 
        ' discovery access.
        Dim fileCodeGroup As New FileCodeGroup( _
            New AllMembershipCondition, _
            FileIOPermissionAccess.AllAccess)

        ' Set the name of the file code group.
        fileCodeGroup.Name = "TempCodeGroup"

        ' Set the description of the file code group.
        fileCodeGroup.Description = "Temp folder permissions group"

        ' Retrieve the string representation of the Policy's attributes.
        ' FileCodeGroup does not use AttributeString, so the value should
        ' be null.
        If (Not fileCodeGroup.AttributeString Is Nothing) Then
            Throw New NullReferenceException( _
                "AttributeString property is not empty")
        End If

        Return fileCodeGroup
    End Function

    ' Add file permission to restrict write access to all files on the 
    ' local machine.
    Private Sub addPolicy(ByRef fileCodeGroup As FileCodeGroup)
        ' Set the PolicyStatement property to a policy with
        ' read access to c:\.
        Dim rootFilePermissions As New FileIOPermission(PermissionState.None)
        rootFilePermissions.AllLocalFiles = FileIOPermissionAccess.Read
        rootFilePermissions.SetPathList(FileIOPermissionAccess.Read, "C:\\")

        Dim namedPermissions As New NamedPermissionSet("RootPermissions")
        namedPermissions.AddPermission(rootFilePermissions)

        fileCodeGroup.PolicyStatement = New PolicyStatement(namedPermissions)
    End Sub

    ' Set the membership condition of the specified FileCodeGroup to 
    ' Intranet zone.
    Private Sub updateMembershipCondition( _
        ByRef fileCodeGroup As FileCodeGroup)

        ' Set the membership condition to the Intranet zone.
        Dim zoneCondition As _
            New ZoneMembershipCondition(SecurityZone.Intranet)

        fileCodeGroup.MembershipCondition = zoneCondition
    End Sub

    ' Add a child group with read-access file permissions to the specified
    ' code group.
    Private Sub addChildCodeGroup(ByRef fileCodeGroup As FileCodeGroup)
        ' Create a file code group with read access.
        Dim tempFolderCodeGroup As New FileCodeGroup( _
            New AllMembershipCondition, _
            FileIOPermissionAccess.Read)

        ' Set the name of the child code group and add it to the specified 
        ' code group.
        tempFolderCodeGroup.Name = "Read-only group"
        fileCodeGroup.AddChild(tempFolderCodeGroup)
    End Sub

    ' Compare two specified FileCodeGroups for equality.
    Private Function CompareTwoCodeGroups( _
        ByVal firstCodeGroup As FileCodeGroup, _
        ByVal secondCodeGroup As FileCodeGroup) As Boolean

        ' Compare two FileCodeGroups for equality.
        If (firstCodeGroup.Equals(secondCodeGroup)) Then
            WriteLine("The two code groups are equal.")
            Return True
        Else
            WriteLine("The two code groups are not equal.")
            Return False
        End If

    End Function

    ' Retrieve the resolved policy based on the executing evidence found 
    ' in the specified code group.
    Private Function ResolveEvidence( _
        ByVal fileCodeGroup As CodeGroup) As String

        Dim policyString As String = ""

        ' Resolve the policy based on the executing assemlby's evidence.
        Dim executingAssembly As [Assembly]
        executingAssembly = Me.GetType().Assembly

        Dim executingEvidence As Evidence = executingAssembly.Evidence

        Dim policy As PolicyStatement
        policy = fileCodeGroup.Resolve(executingEvidence)

        If (Not policy Is Nothing) Then
            policyString = policy.ToString()
        End If

        Return policyString
    End Function

    ' Retrieve the resolved code group based on the executing evidence found
    ' in the specified code group.
    Private Function ResolveGroupToEvidence( _
        ByVal fileCodeGroup As FileCodeGroup) As FileCodeGroup

        ' Resolve matching code groups to the executing assembly.
        Dim executingAssembly As [Assembly]
        executingAssembly = Me.GetType().Assembly

        Dim evidence As Evidence = executingAssembly.Evidence

        Dim codeGroup As CodeGroup
        codeGroup = fileCodeGroup.ResolveMatchingCodeGroups(evidence)

        Return CType(codeGroup, FileCodeGroup)
    End Function

    ' If domain attribute is not found in specified FileCodeGroup, 
    ' add a child Xml element identifying a custom membership condition.
    Private Sub addXmlMember(ByRef fileCodeGroup As FileCodeGroup)
        Dim xmlElement As SecurityElement = fileCodeGroup.ToXml()

        Dim rootElement As New SecurityElement("CodeGroup")
        If (xmlElement.Attribute("domain") Is Nothing) Then
            Dim newElement As New SecurityElement("CustomMembershipCondition")
            newElement.AddAttribute("class", "CustomMembershipCondition")
            newElement.AddAttribute("version", "1")
            newElement.AddAttribute("domain", "contoso.com")

            rootElement.AddChild(newElement)

            fileCodeGroup.FromXml(rootElement)

        End If

        WriteLine("Added a custom membership condition:")
        WriteLine(rootElement.ToString())
    End Sub

    ' Print the properties of the specified code group to the output textbox.
    Private Sub PrintCodeGroup(ByVal codeGroup As CodeGroup)
        ' Compare specified object's type with the FileCodeGroup type.
        If (Not codeGroup.GetType() Is GetType(FileCodeGroup)) Then
            Throw New ArgumentException("Excepted FileCodeGroup type")
        End If

        Dim codeGroupName As String = codeGroup.Name
        Dim membershipCondition As String
        membershipCondition = codeGroup.MembershipCondition.ToString()

        Dim permissionSetName As String = codeGroup.PermissionSetName

        Dim hashCode As Integer = codeGroup.GetHashCode()

        Dim mergeLogic As String = ""
        If (codeGroup.MergeLogic.Equals("Union")) Then
            mergeLogic = " with Union merge logic"
        End If

        ' Retrieve the class path for FileCodeGroup.
        Dim fileGroupClass As String = codeGroup.ToString()

        ' Write summary to console window.
        WriteLine(vbCrLf + "*** " + fileGroupClass + " summary ***")
        Write("A FileCodeGroup named " + codeGroupName + mergeLogic)
        Write(" has been created with hash code(" + hashCode.ToString())
        Write("). It contains a " + membershipCondition)
        Write(" membership condition with the ")
        Write(permissionSetName + " permission set. ")

        WriteLine("It has the following policy: " + _
            ResolveEvidence(codeGroup))
        Dim childCount As Integer = codeGroup.Children.Count
        If (childCount > 0) Then
            Write("There are " + childCount.ToString())
            WriteLine(" child elements in the code group:")

            ' Iterate through the child code groups to display their names and
            '  remove them from the specified code group.
            For i As Int16 = 0 To childCount - 1 Step 1
                ' Get child code group as type FileCodeGroup.
                Dim childCodeGroup As FileCodeGroup
                childCodeGroup = CType(codeGroup.Children(i), FileCodeGroup)

                Write("Removing the " + childCodeGroup.Name + ".")
                ' Remove child codegroup.
                codeGroup.RemoveChild(childCodeGroup)
            Next

            WriteLine("")

        Else
            WriteLine("There are no children found in the code group:")

        End If
    End Sub
    ' Write message to the output textbox.
    Private Sub Write(ByVal message As String)
        tbxOutput.AppendText(message)

    End Sub
    ' Write message with carriage return to the output textbox.
    Private Sub WriteLine(ByVal message As String)
        tbxOutput.AppendText(message + vbCrLf)

    End Sub


    ' Event handler for Exit button.
    Private Sub Button2_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click

        Application.Exit()
    End Sub
#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Panel2 As System.Windows.Forms.Panel
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Panel2 = New System.Windows.Forms.Panel
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.tbxOutput = New System.Windows.Forms.RichTextBox
        Me.Panel2.SuspendLayout()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        '
        'Panel2
        '
        Me.Panel2.Controls.Add(Me.Button1)
        Me.Panel2.Controls.Add(Me.Button2)
        Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel2.DockPadding.All = 20
        Me.Panel2.Location = New System.Drawing.Point(0, 320)
        Me.Panel2.Name = "Panel2"
        Me.Panel2.Size = New System.Drawing.Size(616, 64)
        Me.Panel2.TabIndex = 1
        '
        'Button1
        '
        Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button1.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(446, 20)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(75, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "&Run"
        '
        'Button2
        '
        Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button2.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button2.Location = New System.Drawing.Point(521, 20)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(75, 24)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "E&xit"
        '
        'Panel1
        '
        Me.Panel1.Controls.Add(Me.tbxOutput)
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.Panel1.DockPadding.All = 20
        Me.Panel1.Location = New System.Drawing.Point(0, 0)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(616, 320)
        Me.Panel1.TabIndex = 2
        '
        'tbxOutput
        '
        Me.tbxOutput.AccessibleDescription = _
            "Displays output from application."
        Me.tbxOutput.AccessibleName = "Output textbox."
        Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
        Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
        Me.tbxOutput.Name = "tbxOutput"
        Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
        Me.tbxOutput.TabIndex = 1
        Me.tbxOutput.Text = "Click the Run button to run the application."
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(616, 384)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.Panel2)
        Me.Name = "Form1"
        Me.Text = "FileCodeGroup"
        Me.Panel2.ResumeLayout(False)
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region
End Class
'
' This sample produces the following output:
'
' The two code groups are equal.
' Added a custom membership condition:
'    <CustomMembershipCondition class="CustomMembershipCondition"
'                               version="1"
'                               domain="contoso.com"/>
' 
' Comparing the resolved code group with the initial code group:
' The two code groups are not equal.
' 
' *** System.Security.Policy.FileCodeGroup summary ***
' A FileCodeGroup named  with Union merge logic has been created with hash
' code (113152269). It contains a Zone - Intranet membership condition with
' the Same directory FileIO - NoAccess permission set. Has the following
' policy: 
' There are 1 child elements in the code group:
' Removing the Read-only group.
' 
' This sample completed successfully; press Exit to continue.

備註

謹慎

所有 .NET Framework 和 .NET 版本都已被取代代碼存取安全性 （CAS）。 使用 CAS 相關 API 時，最新版本的 .NET 不會接受 CAS 批注併產生錯誤。 開發人員應該尋求替代方式來完成安全性工作。

程式代碼群組是程式代碼存取安全策略的建置組塊。 每個原則層級都包含可以有子程式代碼群組的根程式代碼群組。 每個子程式代碼群組可以有自己的子程式代碼群組;此行為會延伸到任意數目的層級，形成樹狀結構。 每個程式代碼群組都有成員資格條件，可判斷給定元件是否根據該元件的辨識項屬於它。 只有成員資格條件符合指定元件及其子程式代碼群組的程式代碼群組才會套用原則。

FileCodeGroup 具有與 UnionCodeGroup相同的子系比對語意。 不過，FileCodeGroup 傳回許可權集合，其中包含動態計算 FileIOPermission，授與程式代碼執行所在目錄的檔案存取權;UnionCodeGroup 只會傳回靜態許可權集。 授與的檔案存取類型會當做參數傳遞至建構函式。

此程式代碼群組只會比對透過檔案通訊協定執行的元件，也就是具有指向檔案或 UNC 路徑之 URL 的元件。

建構函式

FileCodeGroup(IMembershipCondition, FileIOPermissionAccess)

已淘汰. 初始化 FileCodeGroup 類別的新實例。

屬性

AttributeString	已淘汰. 取得程式代碼群組之原則語句屬性的字串表示。
Children	已淘汰. 取得或設定程式代碼群組子程式代碼群組的已排序列表。 (繼承來源 CodeGroup)
Description	已淘汰. 取得或設定程式代碼群組的描述。 (繼承來源 CodeGroup)
MembershipCondition	已淘汰. 取得或設定程式代碼群組的成員資格條件。 (繼承來源 CodeGroup)
MergeLogic	已淘汰. 取得合併邏輯。
Name	已淘汰. 取得或設定程式代碼群組的名稱。 (繼承來源 CodeGroup)
PermissionSetName	已淘汰. 取得程式代碼群組的具名許可權集合名稱。
PolicyStatement	已淘汰. 取得或設定與程式代碼群組相關聯的原則語句。 (繼承來源 CodeGroup)

方法

AddChild(CodeGroup)	已淘汰. 將子程式代碼群組新增至目前的程式代碼群組。 (繼承來源 CodeGroup)
Copy()	已淘汰. 製作目前程式代碼群組的深層複本。
CreateXml(SecurityElement, PolicyLevel)	已淘汰. 在衍生類別中覆寫時，串行化衍生程式代碼群組特有的屬性和內部狀態，並將串行化新增至指定的 SecurityElement。 (繼承來源 CodeGroup)
Equals(CodeGroup, Boolean)	已淘汰. 判斷指定的程式代碼群組是否相當於目前的程式代碼群組，如果指定的話，也會檢查子程式代碼群組。 (繼承來源 CodeGroup)
Equals(Object)	已淘汰. 判斷指定的程式代碼群組是否等於目前的程式代碼群組。
FromXml(SecurityElement, PolicyLevel)	已淘汰. 從 XML 編碼重新建構具有指定狀態和原則層級的安全性物件。 (繼承來源 CodeGroup)
FromXml(SecurityElement)	已淘汰. 從 XML 編碼重新建構具有指定狀態的安全性物件。 (繼承來源 CodeGroup)
GetHashCode()	已淘汰. 取得目前程式代碼群組的哈希碼。
GetType()	已淘汰. 取得目前實例的 Type。 (繼承來源 Object)
MemberwiseClone()	已淘汰. 建立目前 Object的淺層複本。 (繼承來源 Object)
ParseXml(SecurityElement, PolicyLevel)	已淘汰. 在衍生類別中覆寫時，從指定的 SecurityElement重新建構衍生程式代碼群組特有的屬性和內部狀態。 (繼承來源 CodeGroup)
RemoveChild(CodeGroup)	已淘汰. 拿掉指定的子程式代碼群組。 (繼承來源 CodeGroup)
Resolve(Evidence)	已淘汰. 針對一組辨識項，解析程式代碼群組及其子系的原則。
ResolveMatchingCodeGroups(Evidence)	已淘汰. 解析相符的程式代碼群組。
ToString()	已淘汰. 傳回表示目前 物件的字串。 (繼承來源 Object)
ToXml()	已淘汰. 建立安全性物件的 XML 編碼及其目前狀態。 (繼承來源 CodeGroup)
ToXml(PolicyLevel)	已淘汰. 建立安全性物件的 XML 編碼方式、其目前狀態，以及程式代碼所在的原則層級。 (繼承來源 CodeGroup)