ReflectionPermission Class
Assembly: mscorlib (in mscorlib.dll)
'Declaration <SerializableAttribute> _ <ComVisibleAttribute(True)> _ Public NotInheritable Class ReflectionPermission Inherits CodeAccessPermission Implements IUnrestrictedPermission 'Usage Dim instance As ReflectionPermission
/** @attribute SerializableAttribute() */ /** @attribute ComVisibleAttribute(true) */ public final class ReflectionPermission extends CodeAccessPermission implements IUnrestrictedPermission
SerializableAttribute ComVisibleAttribute(true) public final class ReflectionPermission extends CodeAccessPermission implements IUnrestrictedPermission
Type is the root of the System.Reflection functionality. Without ReflectionPermission, code can only access the public members of loaded assemblies. This includes, but is not limited to, unrestricted access to Object.GetType, access to public exported types through Type.GetType, and access to GetTypeFromHandle. Some properties of Type, such as FullName and Attributes, are accessible without ReflectionPermission.
Code with the appropriate ReflectionPermission has access to the public, protected, and even private members of any loaded Type. This includes access to Module, Assembly, BaseType, and GetInterfaces.
Caution |
|---|
| Because ReflectionPermission can provide access to private class members and metadata, it is recommended that ReflectionPermission not be granted to Internet code. |
Imports System Imports System.Security Imports System.Security.Permissions Imports Microsoft.VisualBasic <Assembly: CLSCompliant(True)> Public Class ReflectionPermissionDemo ' IsSubsetOf determines whether the current permission is a subset of the specified permission. Private Function IsSubsetOfDemo() As Boolean Dim returnValue As Boolean = True Dim reflection1, reflection2 As ReflectionPermissionFlag Dim reflectionPerm1, reflectionPerm2 As ReflectionPermission Dim reflectionGen1 As New ReflectionGenerator() Dim reflectionGen2 As New ReflectionGenerator() reflectionGen1.ResetIndex() While reflectionGen1.CreateReflection(reflection1) reflectionPerm1 = New ReflectionPermission(reflection1) reflectionGen2.ResetIndex() Console.WriteLine("********************************************************" & ControlChars.Lf) While reflectionGen2.CreateReflection(reflection2) reflectionPerm2 = New ReflectionPermission(reflection2) Try If reflectionPerm1.IsSubsetOf(reflectionPerm2) Then Console.WriteLine((reflectionPerm1.Flags.ToString() & " is a subset of " _ & reflectionPerm2.Flags.ToString())) Else Console.WriteLine((reflectionPerm1.Flags.ToString() & " is not a subset of " _ & reflectionPerm2.Flags.ToString())) End If Catch e As Exception Console.WriteLine(("An exception was thrown for subset :" & reflectionPerm1.ToString() _ & ControlChars.Lf & reflectionPerm2.ToString() & ControlChars.Lf & 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 reflection1, reflection2 As ReflectionPermissionFlag Dim reflectionPerm1, reflectionPerm2 As ReflectionPermission Dim reflectionPerm3 As IPermission Dim reflectionGen1 As New ReflectionGenerator() Dim reflectionGen2 As New ReflectionGenerator() reflectionGen1.ResetIndex() While reflectionGen1.CreateReflection(reflection1) reflectionPerm1 = New ReflectionPermission(reflection1) Console.WriteLine("**********************************************************" & ControlChars.Lf) reflectionGen2.ResetIndex() While reflectionGen2.CreateReflection(reflection2) reflectionPerm2 = New ReflectionPermission(reflection2) reflectionPerm3 = CType(reflectionPerm1.Union(reflectionPerm2), ReflectionPermission) reflectionPerm3 = reflectionPerm1.Union(reflectionPerm2) If reflectionPerm3 Is Nothing Then Console.WriteLine(("The union of " & reflection1.ToString() & " and " _ & reflection2.ToString() & " is null.")) Else Console.WriteLine(("The union of " & reflectionPerm1.Flags.ToString() & " and " _ & reflectionPerm2.Flags.ToString() & " = " _ & CType(reflectionPerm3, ReflectionPermission).Flags.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 reflection1, reflection2 As ReflectionPermissionFlag Dim reflectionPerm1, reflectionPerm2, reflectionPerm3 As ReflectionPermission Dim reflectionGen1 As New ReflectionGenerator() Dim reflectionGen2 As New ReflectionGenerator() reflectionGen1.ResetIndex() While reflectionGen1.CreateReflection(reflection1) reflectionPerm1 = New ReflectionPermission(reflection1) Console.WriteLine("**********************************************************" & ControlChars.Lf) reflectionGen2.ResetIndex() While reflectionGen2.CreateReflection(reflection2) reflectionPerm2 = New ReflectionPermission(reflection2) reflectionPerm3 = CType(reflectionPerm1.Intersect(reflectionPerm2), ReflectionPermission) If Not (reflectionPerm3 Is Nothing) Then Console.WriteLine(("The intersection of " & reflection1.ToString() & " and " _ & reflection2.ToString() & " = " _ & CType(reflectionPerm3, ReflectionPermission).Flags.ToString())) Else Console.WriteLine(("The intersection of " & reflection1.ToString() & " and " _ & reflection2.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 reflection1 As ReflectionPermissionFlag Dim reflectionPerm1, reflectionPerm2 As ReflectionPermission Dim reflectionGen1 As New ReflectionGenerator() Dim reflectionGen2 As New ReflectionGenerator() reflectionGen1.ResetIndex() While reflectionGen1.CreateReflection(reflection1) reflectionPerm1 = New ReflectionPermission(reflection1) reflectionGen2.ResetIndex() Console.WriteLine("********************************************************" & ControlChars.Lf) Try reflectionPerm2 = CType(reflectionPerm1.Copy(), ReflectionPermission) Console.WriteLine(("Result of copy = " & reflectionPerm2.ToString())) Catch e As Exception Console.WriteLine(("Copy failed :" & reflectionPerm1.ToString() & e.ToString())) 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 reflection1 As ReflectionPermissionFlag Dim reflectionPerm1, reflectionPerm2 As ReflectionPermission Dim reflectionGen1 As New ReflectionGenerator() Dim reflectionGen2 As New ReflectionGenerator() reflectionGen1.ResetIndex() While reflectionGen1.CreateReflection(reflection1) reflectionPerm1 = New ReflectionPermission(reflection1) Console.WriteLine("********************************************************" & ControlChars.Lf) reflectionGen2.ResetIndex() Try reflectionPerm2 = New ReflectionPermission(PermissionState.None) reflectionPerm2.FromXml(reflectionPerm1.ToXml()) Console.WriteLine(("Result of ToFromXml = " & reflectionPerm2.ToString())) Catch e As Exception Console.WriteLine(("ToFromXml failed :" & reflectionPerm1.ToString() & e.ToString())) 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. tempReturnCode = IsSubsetOfDemo() If tempReturnCode Then Console.Out.WriteLine("IsSubsetOf demo completed successfully.") Else Console.Out.WriteLine("IsSubsetOf demo failed.") End If returnCode = tempReturnCode AndAlso returnCode ' Call the Union demo. tempReturnCode = UnionDemo() If tempReturnCode Then Console.Out.WriteLine("Union demo completed successfully.") Else Console.Out.WriteLine("Union demo failed.") End If returnCode = tempReturnCode AndAlso returnCode ' Call the Intersect demo. tempReturnCode = IntersectDemo() If tempReturnCode Then Console.Out.WriteLine("Intersect demo completed successfully.") Else Console.Out.WriteLine("Intersect demo failed.") End If returnCode = tempReturnCode AndAlso returnCode ' Call the Copy demo. tempReturnCode = CopyDemo() If tempReturnCode Then Console.Out.WriteLine("Copy demo completed successfully.") Else Console.Out.WriteLine("Copy demo failed.") End If returnCode = tempReturnCode AndAlso returnCode ' Call the ToFromXml demo. tempReturnCode = ToFromXmlDemo() If tempReturnCode Then Console.Out.WriteLine("ToFromXml demo completed successfully.") Else Console.Out.WriteLine("ToFromXml demo failed.") End If returnCode = tempReturnCode AndAlso returnCode Return returnCode End Function 'runDemo ' Test harness. Public Overloads Shared Sub Main(ByVal args() As [String]) Try Dim democase As New ReflectionPermissionDemo() Dim returnCode As Boolean = democase.runDemo() If returnCode Then Console.Out.WriteLine("ReflectionPermission 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("ReflectionPermission 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("ReflectionPermission 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 'ReflectionPermissionDemo ' This class generates ReflectionPermission objects. Friend Class ReflectionGenerator Private myReflection As ReflectionPermissionFlag() = {ReflectionPermissionFlag.AllFlags, ReflectionPermissionFlag.MemberAccess, ReflectionPermissionFlag.NoFlags, ReflectionPermissionFlag.ReflectionEmit, ReflectionPermissionFlag.TypeInformation} Private reflectionIndex As Integer = 0 Public Sub New() ResetIndex() End Sub 'New Public Sub ResetIndex() reflectionIndex = 0 End Sub 'ResetIndex ' CreateReflection creates a ReflectionPermission object. Public Function CreateReflection(ByRef reflection As ReflectionPermissionFlag) As Boolean If reflectionIndex >= myReflection.Length Then reflection = ReflectionPermissionFlag.NoFlags reflectionIndex &= 1 Return False End If reflection = myReflection(reflectionIndex) reflectionIndex = reflectionIndex + 1 Return True End Function End Class
import System.*;
import System.Security.*;
import System.Security.Permissions.*;
/** @assembly CLSCompliant(true)
*/
public class ReflectionPermissionDemo
{
// IsSubsetOf determines whether the current permission is a
// subset of the specified permission.
private boolean IsSubsetOfDemo()
{
boolean returnValue = true;
ReflectionPermissionFlag reflection1[] =
new ReflectionPermissionFlag[1] ;
ReflectionPermissionFlag reflection2[] =
new ReflectionPermissionFlag[1] ;
ReflectionPermission reflectionPerm1[] =
new ReflectionPermission[1] ;
ReflectionPermission reflectionPerm2[] =
new ReflectionPermission[1];
ReflectionGenerator reflectionGen1 =
new ReflectionGenerator();
ReflectionGenerator reflectionGen2 =
new ReflectionGenerator();
reflectionGen1.ResetIndex();
while(reflectionGen1.CreateReflection(reflectionPerm1, reflection1)) {
if (reflectionPerm1[0] == null) {
continue ;
}
reflectionGen2.ResetIndex();
Console.WriteLine("***************************************"
+ "*****************\n");
while(reflectionGen2.CreateReflection(
reflectionPerm2, reflection2)) {
if (reflectionPerm2[0] == null) {
continue ;
}
try {
if ( reflectionPerm1[0].IsSubsetOf(reflectionPerm2[0])) {
Console.WriteLine((reflectionPerm1[0].get_Flags()
+ " is a subset of " +
reflectionPerm2[0].get_Flags()));
}
else {
Console.WriteLine((reflectionPerm1[0].get_Flags()
+ " is not a subset of "
+ reflectionPerm2[0].get_Flags()));
}
}
catch(System.Exception e) {
Console.WriteLine(("An exception was "
+ "thrown for subset :" + reflectionPerm1[0] + "\n"
+ reflectionPerm2[0] + "\n" + e));
returnValue = false;
}
}
}
return returnValue ;
} //IsSubsetOfDemo
// Union creates a new permission that is the union of the
// current permission and the specified permission.
private boolean UnionDemo()
{
boolean returnValue = true;
ReflectionPermissionFlag reflection1[] =
new ReflectionPermissionFlag[1];
ReflectionPermissionFlag reflection2[] =
new ReflectionPermissionFlag[1];
ReflectionPermission reflectionPerm1[] =
new ReflectionPermission[1];
ReflectionPermission reflectionPerm2[] =
new ReflectionPermission[1];
IPermission reflectionPerm3;
ReflectionGenerator reflectionGen1 =
new ReflectionGenerator();
ReflectionGenerator reflectionGen2 =
new ReflectionGenerator();
reflectionGen1.ResetIndex();
while(reflectionGen1.CreateReflection(reflectionPerm1, reflection1)) {
if (reflectionPerm1[0] == null) {
continue ;
}
Console.WriteLine("*******************************************"
+ "***************\n");
reflectionGen2.ResetIndex();
while(reflectionGen2.CreateReflection(reflectionPerm2,
reflection2)) {
if (reflectionPerm2[0] == null) {
continue ;
}
reflectionPerm3 =((ReflectionPermission)(
reflectionPerm1[0].Union(reflectionPerm2[0])));
reflectionPerm3 = reflectionPerm1[0].Union(reflectionPerm2[0]);
if (reflectionPerm3 == null) {
Console.WriteLine(("The union of " + reflection1[0]
+ " and " + reflection2[0] + " is null."));
}
else {
Console.WriteLine(("The union of "
+ reflectionPerm1[0].get_Flags() + " and "
+ reflectionPerm2[0].get_Flags() + " = "
+ ((ReflectionPermission)(reflectionPerm3)).
get_Flags().ToString()));
}
}
}
return returnValue ;
} //UnionDemo
// Intersect creates and returns a new permission that is the
// intersection of the current permission and the permission specified.
private boolean IntersectDemo()
{
boolean returnValue = true;
ReflectionPermissionFlag reflection1[] =
new ReflectionPermissionFlag[1];
ReflectionPermissionFlag reflection2[] =
new ReflectionPermissionFlag[1];
ReflectionPermission reflectionPerm1[] =
new ReflectionPermission[1];
ReflectionPermission reflectionPerm2[] =
new ReflectionPermission[1];
ReflectionPermission reflectionPerm3;
ReflectionGenerator reflectionGen1 =
new ReflectionGenerator();
ReflectionGenerator reflectionGen2 =
new ReflectionGenerator();
reflectionGen1.ResetIndex();
while(reflectionGen1.CreateReflection(reflectionPerm1, reflection1)) {
if (reflectionPerm1[0] == null) {
continue ;
}
Console.WriteLine("***************************************"
+ "*******************\n");
reflectionGen2.ResetIndex();
while(reflectionGen2.CreateReflection(reflectionPerm2,
reflection2)) {
if (reflectionPerm2[0] == null) {
continue ;
}
reflectionPerm3 =((ReflectionPermission)(
reflectionPerm1[0].Intersect(reflectionPerm2[0])));
if (reflectionPerm3 != null) {
Console.WriteLine(("The intersection of "
+ reflection1[0] + " and "
+ reflection2[0] + " = "
+ ((ReflectionPermission)(reflectionPerm3)).
get_Flags().ToString()));
}
else {
Console.WriteLine(("The intersection of "
+ reflection1[0] + " and " + reflection2[0]
+ " is null."));
}
}
}
return returnValue ;
} //IntersectDemo
//Copy creates and returns an identical copy of the current permission.
private boolean CopyDemo()
{
boolean returnValue = true;
ReflectionPermissionFlag reflection1[] =
new ReflectionPermissionFlag[1];
ReflectionPermission reflectionPerm1[] =
new ReflectionPermission[1];
ReflectionPermission reflectionPerm2[] =
new ReflectionPermission[1];
ReflectionGenerator reflectionGen1 =
new ReflectionGenerator();
ReflectionGenerator reflectionGen2 =
new ReflectionGenerator();
reflectionGen1.ResetIndex();
while(reflectionGen1.CreateReflection(reflectionPerm1, reflection1)) {
if (reflectionPerm1[0] == null) {
continue ;
}
reflectionGen2.ResetIndex();
Console.WriteLine("*********************************"
+ "***********************\n");
try {
reflectionPerm2[0] =((ReflectionPermission)(
reflectionPerm1[0].Copy()));
Console.WriteLine(("Result of copy = "
+ reflectionPerm2[0].ToString()));
}
catch(System.Exception e){
Console.WriteLine(("Copy failed :"
+ reflectionPerm1[0].ToString() + e));
continue ;
}
}
return returnValue ;
} //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 boolean ToFromXmlDemo()
{
boolean returnValue = true;
ReflectionPermissionFlag reflection1[] =
new ReflectionPermissionFlag[1];
ReflectionPermission reflectionPerm1[] =
new ReflectionPermission[1];
ReflectionPermission reflectionPerm2[] =
new ReflectionPermission[1];
ReflectionGenerator reflectionGen1 =
new ReflectionGenerator();
ReflectionGenerator reflectionGen2 =
new ReflectionGenerator();
reflectionGen1.ResetIndex();
while(reflectionGen1.CreateReflection(reflectionPerm1, reflection1)) {
if (reflectionPerm1[0] == null) {
continue ;
}
Console.WriteLine("**************************************"
+ "******************\n");
reflectionGen2.ResetIndex();
try {
reflectionPerm2[0] =
new ReflectionPermission(PermissionState.None);
reflectionPerm2[0].FromXml(reflectionPerm1[0].ToXml());
Console.WriteLine(("Result of ToFromXml = "
+ reflectionPerm2[0].ToString()));
}
catch(System.Exception e) {
Console.WriteLine(("ToFromXml failed :"
+ reflectionPerm1[0].ToString() + e));
continue ;
}
}
return returnValue ;
} //ToFromXmlDemo
// Invoke all demos.
public boolean runDemo()
{
boolean returnCode = true;
boolean tempReturnCode;
// Call the IsSubsetOf demo.
if (tempReturnCode = IsSubsetOfDemo()) {
Console.get_Out().WriteLine("IsSubsetOf demo "
+ "completed successfully.");
}
else {
Console.get_Out().WriteLine("IsSubsetOf demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call the Union demo.
if (tempReturnCode = UnionDemo()) {
Console.get_Out().WriteLine("Union demo completed successfully.");
}
else {
Console.get_Out().WriteLine("Union demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call the Intersect demo.
if (tempReturnCode = IntersectDemo()) {
Console.get_Out().WriteLine("Intersect demo completed "
+ "successfully.");
}
else {
Console.get_Out().WriteLine("Intersect demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call the Copy demo.
if (tempReturnCode = CopyDemo()) {
Console.get_Out().WriteLine("Copy demo completed successfully.");
}
else {
Console.get_Out().WriteLine("Copy demo failed.");
}
returnCode = tempReturnCode && returnCode;
// Call the ToFromXml demo.
if (tempReturnCode = ToFromXmlDemo()) {
Console.get_Out().WriteLine("ToFromXml demo completed "
+ "successfully.");
}
else {
Console.get_Out().WriteLine("ToFromXml demo failed.");
}
returnCode = tempReturnCode && returnCode;
return returnCode ;
} //runDemo
// Test harness.
public static void main(String[] args)
{
try {
ReflectionPermissionDemo democase =
new ReflectionPermissionDemo();
boolean returnCode = democase.runDemo();
if (returnCode) {
Console.get_Out().WriteLine("ReflectionPermission "
+ "demo completed successfully.");
Console.get_Out().WriteLine("Press the Enter key to exit.");
String consoleInput = Console.ReadLine();
System.Environment.set_ExitCode(100);
}
else {
Console.get_Out().WriteLine(
"ReflectionPermission demo failed.");
Console.get_Out().WriteLine("Press the Enter key to exit.");
String consoleInput = Console.ReadLine();
System.Environment.set_ExitCode(101);
}
}
catch(System.Exception e) {
Console.get_Out().WriteLine("ReflectionPermission demo failed.");
Console.WriteLine(e.ToString());
Console.get_Out().WriteLine("Press the Enter key to exit.");
String consoleInput = Console.ReadLine();
System.Environment.set_ExitCode(101);
}
} //main
} //ReflectionPermissionDemo
// This class generates ReflectionPermission objects.
class ReflectionGenerator
{
private ReflectionPermissionFlag myReflection[] = {
ReflectionPermissionFlag.AllFlags,
ReflectionPermissionFlag.MemberAccess,
ReflectionPermissionFlag.NoFlags,
ReflectionPermissionFlag.ReflectionEmit,
ReflectionPermissionFlag.TypeInformation};
private int reflectionIndex = 0;
public ReflectionGenerator()
{
ResetIndex();
} //ReflectionGenerator
public void ResetIndex()
{
reflectionIndex = 0;
} //ResetIndex
// CreateReflection creates a ReflectionPermission object.
public boolean CreateReflection(ReflectionPermission reflectionPerm[],
ReflectionPermissionFlag reflection[])
{
if (reflectionIndex >= myReflection.length) {
reflectionPerm[0] = new ReflectionPermission(PermissionState.None);
reflection[0] = ReflectionPermissionFlag.NoFlags;
reflectionIndex++;
return false ;
}
reflection[0] = myReflection[reflectionIndex ++];
try {
reflectionPerm[0] = new ReflectionPermission(reflection[0]);
return true ;
}
catch(System.Exception e){
Console.WriteLine(("Cannot create ReflectionPermission: "
+ reflection[0] + " " + e));
reflectionPerm[0] = new ReflectionPermission(PermissionState.None);
reflection[0] = ReflectionPermissionFlag.NoFlags;
return true ;
}
} //CreateReflection
} //ReflectionGenerator
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
Caution