GacIdentityPermission Class
Assembly: mscorlib (in mscorlib.dll)
[SerializableAttribute] [ComVisibleAttribute(true)] public ref class GacIdentityPermission sealed : public CodeAccessPermission
/** @attribute SerializableAttribute() */ /** @attribute ComVisibleAttribute(true) */ public final class GacIdentityPermission extends CodeAccessPermission
SerializableAttribute ComVisibleAttribute(true) public final class GacIdentityPermission extends CodeAccessPermission
Not applicable.
Files are either in the global assembly cache, or they are not. There are no variations to the permission granted, so all GacIdentityPermission objects are equal.
Important: |
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| In the .NET Framework versions 1.0 and 1.1, demands on the identity permissions are effective even when the calling assembly is fully trusted. That is, although the calling assembly has full trust, a demand for an identity permission fails if the assembly does not meet the demanded criteria. In the .NET Framework version 2.0, demands for identity permissions are ineffective if the calling assembly has full trust. This assures consistency for all permissions, eliminating the treatment of identity permissions as a special case. |
The following code example shows the behavior of the GacIdentityPermission class methods.
Note: |
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| The code example is intended to show the behavior of the methods, not to demonstrate their use. In general, the methods of permission classes are used by the security infrastructure; they are not typically used in applications. Generally, only the constructors are used in application code. The created instance validates or controls resource access by using inherited CodeAccessPermission methods such as Demand. |
using namespace System; using namespace System::Security; using namespace System::Security::Permissions; public ref class GacIdentityPermissionDemo { private: // IsSubsetOf determines whether the current permission is a subset of the specified permission. bool IsSubsetOfDemo() { try { GacIdentityPermission ^ Gac1 = gcnew GacIdentityPermission; GacIdentityPermission ^ Gac2 = gcnew GacIdentityPermission( PermissionState::None ); if ( Gac1->Equals( Gac2 ) ) Console::WriteLine( "GacIdentityPermission() equals GacIdentityPermission(PermissionState.None)." ); if ( Gac1->IsSubsetOf( Gac2 ) ) { Console::WriteLine( "{0} is a subset of {1}", Gac1, Gac2 ); } else { Console::WriteLine( "{0} is not a subset of {1}", Gac1, Gac2 ); } } catch ( Exception^ e ) { Console::WriteLine( "An exception was thrown : {0}", e ); return false; } return true; } // Union creates a new permission that is the union of the current permission // and the specified permission. bool UnionDemo() { GacIdentityPermission ^ Gac1 = gcnew GacIdentityPermission( PermissionState::None ); GacIdentityPermission ^ Gac2 = gcnew GacIdentityPermission; try { GacIdentityPermission ^ p3 = dynamic_cast<GacIdentityPermission^>(Gac1->Union( Gac2 )); if ( p3 != nullptr ) { Console::WriteLine( "The union of two GacIdentityPermissions was successful." ); } else { Console::WriteLine( "The union of two GacIdentityPermissions failed." ); return false; } } catch ( Exception^ e ) { Console::WriteLine( "An exception was thrown : {0}", e ); return false; } return true; } // Intersect creates and returns a new permission that is the intersection of the // current permission and the specified permission. bool IntersectDemo() { GacIdentityPermission ^ Gac1 = gcnew GacIdentityPermission; GacIdentityPermission ^ Gac2 = gcnew GacIdentityPermission; try { GacIdentityPermission ^ p3 = dynamic_cast<GacIdentityPermission^>(Gac1->Intersect( Gac2 )); if ( p3 != nullptr ) { Console::WriteLine( "The intersection of the two permissions = {0}\n", p3 ); } else { Console::WriteLine( "The intersection of the two permissions is null.\n" ); } } catch ( Exception^ e ) { Console::WriteLine( "An exception was thrown : {0}", e ); return false; } return true; } //Copy creates and returns an identical copy of the current permission. bool CopyDemo() { GacIdentityPermission ^ Gac1 = gcnew GacIdentityPermission; GacIdentityPermission ^ Gac2 = gcnew GacIdentityPermission; Console::WriteLine( "**************************************************************************" ); try { Gac2 = dynamic_cast<GacIdentityPermission^>(Gac1->Copy()); if ( Gac2 != nullptr ) { Console::WriteLine( "Result of copy = {0}\n", Gac2 ); } } catch ( Exception^ e ) { Console::WriteLine( "Copy failed : {0}{1}", Gac1, e ); return false; } return true; } // ToXml creates an XML encoding of the permission and its current state; FromXml reconstructs a // permission with the specified state from the XML encoding. bool ToFromXmlDemo() { GacIdentityPermission ^ Gac1 = gcnew GacIdentityPermission; GacIdentityPermission ^ Gac2 = gcnew GacIdentityPermission; Console::WriteLine( "**************************************************************************" ); try { Gac2 = gcnew GacIdentityPermission( PermissionState::None ); Gac2->FromXml( Gac1->ToXml() ); bool result = Gac2->Equals( Gac1 ); if ( Gac2->IsSubsetOf( Gac1 ) && Gac1->IsSubsetOf( Gac2 ) ) { Console::WriteLine( "Result of ToFromXml = {0}", Gac2 ); } else { Console::WriteLine( Gac2 ); Console::WriteLine( Gac1 ); return false; } } catch ( Exception^ e ) { Console::WriteLine( "ToFromXml failed. {0}", e ); return false; } return true; } public: // Invoke all demos. bool RunDemo() { bool returnCode = true; bool tempReturnCode; // Call the IsSubsetOf demo. if ( tempReturnCode = IsSubsetOfDemo() ) Console::WriteLine( "IsSubsetOf demo completed successfully." ); else Console::WriteLine( "Subset demo failed." ); returnCode = tempReturnCode && returnCode; // Call the Union demo. if ( tempReturnCode = UnionDemo() ) Console::WriteLine( "Union demo completed successfully." ); else Console::WriteLine( "Union demo failed." ); returnCode = tempReturnCode && returnCode; // Call the Intersect demo. if ( tempReturnCode = IntersectDemo() ) Console::WriteLine( "Intersect demo completed successfully." ); else Console::WriteLine( "Intersect demo failed." ); returnCode = tempReturnCode && returnCode; // Call the Copy demo. if ( tempReturnCode = CopyDemo() ) Console::WriteLine( "Copy demo completed successfully." ); else Console::WriteLine( "Copy demo failed." ); returnCode = tempReturnCode && returnCode; // Call the ToFromXML demo. if ( tempReturnCode = ToFromXmlDemo() ) Console::WriteLine( "ToFromXML demo completed successfully." ); else Console::WriteLine( "ToFromXml demo failed." ); returnCode = tempReturnCode && returnCode; return (returnCode); } }; // Test harness. int main() { try { GacIdentityPermissionDemo^ testcase = gcnew GacIdentityPermissionDemo; bool returnCode = testcase->RunDemo(); if ( returnCode ) { Console::WriteLine( "The GacIdentityPermission demo completed successfully." ); Console::WriteLine( "Press the Enter key to exit." ); Console::ReadLine(); System::Environment::ExitCode = 100; } else { Console::WriteLine( "The GacIdentityPermission demo failed." ); Console::WriteLine( "Press the Enter key to exit." ); Console::ReadLine(); System::Environment::ExitCode = 101; } } catch ( Exception^ e ) { Console::WriteLine( "The GacIdentityPermission demo failed." ); Console::WriteLine( e ); Console::WriteLine( "Press the Enter key to exit." ); Console::ReadLine(); System::Environment::ExitCode = 101; } }
import System.* ;
import System.Security.* ;
import System.Security.Permissions.*;
public class GacIdentityPermissionDemo
{
// IsSubsetOf determines whether the current permission is a subset
// of the specified permission.
private boolean IsSubsetOfDemo()
{
try {
GacIdentityPermission gac1 = new GacIdentityPermission();
GacIdentityPermission gac2 = new GacIdentityPermission(
PermissionState.None);
if (gac1.Equals(gac2)) {
Console.WriteLine("GacIdentityPermission() "
+ "equals GacIdentityPermission(PermissionState.None).");
}
if (gac1.IsSubsetOf(gac2)) {
Console.WriteLine((gac1 + " is a subset of " + gac2));
}
else {
Console.WriteLine((gac1 + " is not a subset of " + gac2));
}
}
catch (System.Exception e) {
Console.WriteLine(("An exception was thrown : " + e));
return false;
}
return true;
} //IsSubsetOfDemo
// Union creates a new permission that is the union of the current
// permission and the specified permission.
private boolean UnionDemo()
{
GacIdentityPermission gac1 = new GacIdentityPermission(
PermissionState.None);
GacIdentityPermission gac2 = new GacIdentityPermission();
try {
GacIdentityPermission p3 =
((GacIdentityPermission)(gac1.Union(gac2)));
if (p3 != null) {
Console.WriteLine("The union of two GacIdentityPermissions "
+ "was successful.");
}
else {
Console.WriteLine("The union of two "
+ "GacIdentityPermissions failed.");
return false;
}
}
catch (System.Exception e) {
Console.WriteLine(("An exception was thrown : " + e));
return false;
}
return true;
} //UnionDemo
// Intersect creates and returns a new permission that is the
// intersection of the current permission and the specified permission.
private boolean IntersectDemo()
{
GacIdentityPermission gac1 = new GacIdentityPermission();
GacIdentityPermission gac2 = new GacIdentityPermission();
try {
GacIdentityPermission p3 =
((GacIdentityPermission)(gac1.Intersect(gac2)));
if (p3 != null) {
Console.WriteLine(("The intersection of the two permissions = "
+ p3.ToString() + "\n"));
}
else {
Console.WriteLine("The intersection of the two permissions "
+ "is null.\n");
}
}
catch (System.Exception e) {
Console.WriteLine(("An exception was thrown : " + e));
return false;
}
return true;
} //IntersectDemo
// Copy creates and returns an identical copy of the current permission.
private boolean CopyDemo()
{
GacIdentityPermission gac1 = new GacIdentityPermission();
GacIdentityPermission gac2 = new GacIdentityPermission();
Console.WriteLine("****************************************"
+ "**********************************");
try {
gac2 = ((GacIdentityPermission)(gac1.Copy()));
if (gac2 != null) {
Console.WriteLine(("Result of copy = "
+ gac2.ToString() + "\n"));
}
}
catch (System.Exception e) {
Console.WriteLine(("Copy failed : " + gac1.ToString() + e));
return false;
}
return true;
} //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()
{
GacIdentityPermission gac1 = new GacIdentityPermission();
GacIdentityPermission gac2 = new GacIdentityPermission();
Console.WriteLine("***************************************"
+ "***********************************");
try {
gac2 = new GacIdentityPermission(PermissionState.None);
gac2.FromXml(gac1.ToXml());
boolean result = gac2.Equals(gac1);
if (gac2.IsSubsetOf(gac1) && gac1.IsSubsetOf(gac2)) {
Console.WriteLine(("Result of ToFromXml = " + gac2.ToString()));
}
else {
Console.WriteLine(gac2.ToString());
Console.WriteLine(gac1.ToString());
return false;
}
}
catch (System.Exception e) {
Console.WriteLine(("ToFromXml failed. " + e));
return false;
}
return true;
} //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("Subset 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 {
GacIdentityPermissionDemo testcase =
new GacIdentityPermissionDemo();
boolean returnCode = testcase.RunDemo();
if (returnCode) {
Console.get_Out().WriteLine("The GacIdentityPermission 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("The GacIdentityPermission "
+ "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("The GacIdentityPermission "
+ "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
} //GacIdentityPermissionDemo
System.Security.CodeAccessPermission
System.Security.Permissions.GacIdentityPermission
Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
Important: