NamedPermissionSet Class
Defines a permission set that has a name and description associated with it. This class cannot be inherited.
Assembly: mscorlib (in mscorlib.dll)
Named permission sets are used in security policy administration to specify the permissions to be granted to code that belongs to certain code groups. Names are strings of alphanumeric characters. Description strings can consist of any printable characters. For more information, see Named Permission Sets.
The following code example shows the use of members of the NamedPermissionSet class.
Imports System Imports System.Reflection Imports System.Security Imports System.Security.Permissions Imports System.Security.Policy Imports System.IO Imports System.Collections Public Class Form1 Inherits System.Windows.Forms.Form #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 TextBox1 As System.Windows.Forms.TextBox Friend WithEvents Button1 As System.Windows.Forms.Button Friend WithEvents Button2 As System.Windows.Forms.Button <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.TextBox1 = New System.Windows.Forms.TextBox Me.Button1 = New System.Windows.Forms.Button Me.Button2 = New System.Windows.Forms.Button Me.SuspendLayout() ' 'TextBox1 ' Me.TextBox1.Location = New System.Drawing.Point(16, 40) Me.TextBox1.Multiline = True Me.TextBox1.Name = "TextBox1" Me.TextBox1.ScrollBars = System.Windows.Forms.ScrollBars.Both Me.TextBox1.Size = New System.Drawing.Size(752, 336) Me.TextBox1.TabIndex = 0 Me.TextBox1.Text = "" ' 'Button1 ' Me.Button1.Location = New System.Drawing.Point(440, 440) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(80, 24) Me.Button1.TabIndex = 1 Me.Button1.Text = "Run Demo" ' 'Button2 ' Me.Button2.Location = New System.Drawing.Point(568, 440) Me.Button2.Name = "Button2" Me.Button2.Size = New System.Drawing.Size(88, 24) Me.Button2.TabIndex = 2 Me.Button2.Text = "Exit" ' 'Form1 ' Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(808, 502) Me.Controls.Add(Me.Button2) Me.Controls.Add(Me.Button1) Me.Controls.Add(Me.TextBox1) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub #End Region Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click PermissionSetDemo() End Sub Private Sub PermissionSetDemo() TextBox1.AppendText("Executing NamedPermissionSetDemo") Try ' Create a new named permission set and add it to Machine policy. Dim namedPS1 As NamedPermissionSet namedPS1 = CreateCompanyPermission() TextBox1.AppendText(("The name of the custom named permission set is " + namedPS1.Name + ControlChars.Lf)) TextBox1.AppendText(("The description of the custom named permission set is " + namedPS1.Description + ControlChars.Lf)) DisplayPermissions(namedPS1) Dim namedPS2 As New NamedPermissionSet("MyPermssionSetCopy") ' Perform a ToXml/FromXml round trip. namedPS2.FromXml(namedPS1.ToXml()) TextBox1.AppendText(ControlChars.Lf + "Result of the ToXml/FromXml round trip:") ' For simplicity the results are displayed using a method call. DisplayPermissions(namedPS2) ' Create and display a copy of a permission set. Dim namedPS3 As NamedPermissionSet = CType(namedPS2.Copy(), NamedPermissionSet) TextBox1.AppendText("Is the copy equal to the original? " + namedPS2.Equals(namedPS3).ToString()) Dim namedPS4 As New NamedPermissionSet("Second copy", namedPS3) TextBox1.AppendText(("The name of the new permission set is " + namedPS4.Name + ControlChars.Lf)) ' Show that the new named permission set has the same permissions as the original. DisplayPermissions(namedPS4) ' The hash code for two instances of the same permission might be different, hence a hash code should not be used to ' compare two named permission sets. TextBox1.AppendText("The hash code of the original permission set is " + namedPS2.GetHashCode().ToString()) TextBox1.AppendText("The hash code of the copy is " + namedPS4.GetHashCode().ToString()) Catch e As Exception TextBox1.AppendText(("Exception thrown: " + e.Message.ToString())) End Try End Sub 'PermissionSetDemo Private Function DisplayPermissions(ByVal namedPS1 As NamedPermissionSet) As Boolean ' Display results of namedPS.GetEnumerator. Dim psEnumerator As IEnumerator = namedPS1.GetEnumerator() While psEnumerator.MoveNext() TextBox1.AppendText(CType(psEnumerator.Current, IPermission).ToXml().ToString()) End While Return True End Function 'DisplayPermissions ' The following method uses the LocalIntranet permission set to create ' a custom permission set named MyCompany. The new permission set is ' added to local Machine policy. The custom named permission set is returned. Private Function CreateCompanyPermission() As NamedPermissionSet Dim policyEnumerator As IEnumerator = SecurityManager.PolicyHierarchy() ' Move through the policy levels to the Machine policy level. While policyEnumerator.MoveNext() Dim currentLevel As PolicyLevel = CType(policyEnumerator.Current, PolicyLevel) If currentLevel.Label = "Machine" Then ' Enumerate the permission sets in the Machine policy level. Dim namedPermissions As IList = currentLevel.NamedPermissionSets Dim namedPermission As IEnumerator = namedPermissions.GetEnumerator() ' Locate the LocalIntranet permission set. While namedPermission.MoveNext() If CType(namedPermission.Current, NamedPermissionSet).Name = "LocalIntranet" Then ' The current permission set is a copy of the LocalIntranet permission set. ' It can be modified to provide the permissions for the new permission set. ' Rename the copy to the name chosen for the new permission set. CType(namedPermission.Current, NamedPermissionSet).Name = "MyCompany" CType(namedPermission.Current, NamedPermissionSet).Description = "My custom named permission set" Dim permissions As IEnumerator = CType(namedPermission.Current, NamedPermissionSet).GetEnumerator() ' Remove the current security permission from the permission set and replace it ' with a new security permission that does not have the right to assert permissions. While permissions.MoveNext() If permissions.Current.GetType().ToString() = "System.Security.Permissions.SecurityPermission" Then ' Remove the current security permission. CType(namedPermission.Current, NamedPermissionSet).RemovePermission(permissions.Current.GetType()) ' Add a new security permission that only allows execution. CType(namedPermission.Current, NamedPermissionSet).AddPermission(New SecurityPermission(SecurityPermissionFlag.Execution)) Exit While End If End While Try ' If you run this application twice, the following instruction throws ' an exception because the named permission set already exists. ' You can remove the custom named permission set using either Caspole.exe or the ' .NET Framework Configuration tool (Mscorcfg.msc). currentLevel.AddNamedPermissionSet(CType(namedPermission.Current, NamedPermissionSet)) SecurityManager.SavePolicy() Return CType(namedPermission.Current, NamedPermissionSet) ' Catch the exception for a duplicate permission set. Catch e As System.ArgumentException TextBox1.AppendText(e.Message + ControlChars.Lf) Return CType(namedPermission.Current, NamedPermissionSet) End Try End If End While End If End While ' The following code is executed only if the LocalIntranet permission set has been removed. Return New NamedPermissionSet("Nothing") End Function 'CreateCompanyPermission Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Form1.ActiveForm.Close() End Sub End Class 'NamedPermissionSetDemo
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.