SocketPermission.Intersect(IPermission) Метод
Определение
Важно!
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Возвращает логическое пересечение между двумя экземплярами SocketPermission.
public:
override System::Security::IPermission ^ Intersect(System::Security::IPermission ^ target);
public override System.Security.IPermission Intersect (System.Security.IPermission target);
override this.Intersect : System.Security.IPermission -> System.Security.IPermission
Public Overrides Function Intersect (target As IPermission) As IPermission
Параметры
- target
- IPermission
Экземпляр SocketPermission для пересечения с текущим экземпляром.
Возвращаемое значение
Экземпляр SocketPermission, представляющий собой пересечение двух экземпляров SocketPermission. Если это пересечение пустое, данный метод возвращает null
. Если параметр target
является пустой ссылкой, метод возвращает null
.
Исключения
Параметр target
не является объектом SocketPermission.
DnsPermission не предоставлено оператору, вызывающему метод.
Примеры
В следующем примере метод используется Intersect для получения логического пересечения между двумя SocketPermission экземплярами.
SocketPermission^ socketPermission1 = gcnew SocketPermission( PermissionState::Unrestricted );
// Create a 'SocketPermission' Object* for two ip addresses.
SocketPermission^ socketPermission2 = gcnew SocketPermission( PermissionState::None );
SecurityElement^ securityElement1 = socketPermission2->ToXml();
// 'SocketPermission' Object* for 'Connect' permission
SecurityElement^ securityElement2 = gcnew SecurityElement( "ConnectAccess" );
// Format to specify ip address are <ip-address>#<port>#<transport-type>
// First 'SocketPermission' ip-address is '192.168.144.238' for 'All' transport types and
// for 'All'ports for the ip-address.
SecurityElement^ securityElement3 = gcnew SecurityElement( "URI","192.168.144.238#-1#3" );
// Second 'SocketPermission' ip-address is '192.168.144.240' for 'All' transport types and
// for 'All' ports for the ip-address.
SecurityElement^ securityElement4 = gcnew SecurityElement( "URI","192.168.144.240#-1#3" );
securityElement2->AddChild( securityElement3 );
securityElement2->AddChild( securityElement4 );
securityElement1->AddChild( securityElement2 );
// Obtain a 'SocketPermission' Object* using 'FromXml' method.
socketPermission2->FromXml( securityElement1 );
Console::WriteLine( "\nDisplays the result of FromXml method : \n" );
Console::WriteLine( socketPermission2 );
// Create another 'SocketPermission' Object* with two ip addresses.
// First 'SocketPermission' ip-address is '192.168.144.238' for 'All' transport types and for 'All' ports for the ip-address.
SocketPermission^ socketPermission3 =
gcnew SocketPermission( NetworkAccess::Connect,
TransportType::All,
"192.168.144.238",
SocketPermission::AllPorts );
// Second 'SocketPermission' ip-address is '192.168.144.239' for 'All' transport types and for 'All' ports for the ip-address.
socketPermission3->AddPermission( NetworkAccess::Connect,
TransportType::All,
"192.168.144.239",
SocketPermission::AllPorts );
Console::WriteLine( "Displays the result of AddPermission method : \n" );
Console::WriteLine( socketPermission3 );
// Find the intersection between two 'SocketPermission' objects.
socketPermission1 = dynamic_cast<SocketPermission^>(socketPermission2->Intersect( socketPermission3 ));
Console::WriteLine( "Displays the result of Intersect method :\n " );
Console::WriteLine( socketPermission1 );
// Demand that the calling method have the requsite socket permission.
socketPermission1->Demand();
SocketPermission socketPermission1 = new SocketPermission(PermissionState.Unrestricted);
// Create a 'SocketPermission' object for two ip addresses.
SocketPermission socketPermission2 = new SocketPermission(PermissionState.None);
SecurityElement securityElement1 = socketPermission2.ToXml();
// 'SocketPermission' object for 'Connect' permission
SecurityElement securityElement2 = new SecurityElement("ConnectAccess");
// Format to specify ip address are <ip-address>#<port>#<transport-type>
// First 'SocketPermission' ip-address is '192.168.144.238' for 'All' transport types and
// for 'All'ports for the ip-address.
SecurityElement securityElement3 = new SecurityElement("URI", "192.168.144.238#-1#3");
// Second 'SocketPermission' ip-address is '192.168.144.240' for 'All' transport types and
// for 'All' ports for the ip-address.
SecurityElement securityElement4 = new SecurityElement("URI", "192.168.144.240#-1#3");
securityElement2.AddChild(securityElement3);
securityElement2.AddChild(securityElement4);
securityElement1.AddChild(securityElement2);
// Obtain a 'SocketPermission' object using 'FromXml' method.
socketPermission2.FromXml(securityElement1);
Console.WriteLine("\nDisplays the result of FromXml method : \n");
Console.WriteLine(socketPermission2.ToString());
// Create another 'SocketPermission' object with two ip addresses.
// First 'SocketPermission' ip-address is '192.168.144.238' for 'All' transport types and for 'All' ports for the ip-address.
SocketPermission socketPermission3 =
new SocketPermission(NetworkAccess.Connect,
TransportType.All,
"192.168.144.238",
SocketPermission.AllPorts);
// Second 'SocketPermission' ip-address is '192.168.144.239' for 'All' transport types and for 'All' ports for the ip-address.
socketPermission3.AddPermission(NetworkAccess.Connect,
TransportType.All,
"192.168.144.239",
SocketPermission.AllPorts);
Console.WriteLine("Displays the result of AddPermission method : \n");
Console.WriteLine(socketPermission3.ToString());
// Find the intersection between two 'SocketPermission' objects.
socketPermission1 = (SocketPermission)socketPermission2.Intersect(socketPermission3);
Console.WriteLine("Displays the result of Intersect method :\n ");
Console.WriteLine(socketPermission1.ToString());
// Demand that the calling method have the requsite socket permission.
socketPermission1.Demand();
Dim socketPermission1 As New SocketPermission(PermissionState.Unrestricted)
'Create a 'SocketPermission' object for two ip addresses.
Dim socketPermission2 As New SocketPermission(PermissionState.None)
Dim securityElement1 As SecurityElement = socketPermission2.ToXml()
''SocketPermission' object for 'Connect' permission
Dim securityElement2 As New SecurityElement("ConnectAccess")
'Format to specify ip address are <ip-address>#<port>#<transport-type>
'First 'SocketPermission' ip-address is '192.168.144.238' for 'All' transport types and for 'All'
' ports for the ip-address.
Dim securityElement3 As New SecurityElement("URI", "192.168.144.238#-1#3")
'Second 'SocketPermission' ip-address is '192.168.144.240' for 'All' transport types and for 'All' ports for the ip-address.
Dim securityElement4 As New SecurityElement("URI", "192.168.144.240#-1#3")
securityElement2.AddChild(securityElement3)
securityElement2.AddChild(securityElement4)
securityElement1.AddChild(securityElement2)
'Obtain a 'SocketPermission' object using 'FromXml' method.
socketPermission2.FromXml(securityElement1)
Console.WriteLine(ControlChars.Cr + "Displays the result of FromXml method : " + ControlChars.Cr)
Console.WriteLine(socketPermission2.ToString())
'Create another 'SocketPermission' object with two ip addresses.
'First 'SocketPermission' ip-address is '192.168.144.238' for 'All' transport types and for 'All' ports for the ip-address.
Dim socketPermission3 As New SocketPermission(NetworkAccess.Connect, TransportType.All, "192.168.144.238", SocketPermission.AllPorts)
'Second 'SocketPermission' ip-address is '192.168.144.239' for 'All' transport types and for 'All' ports for the ip-address.
socketPermission3.AddPermission(NetworkAccess.Connect, TransportType.All, "192.168.144.239", SocketPermission.AllPorts)
Console.WriteLine("Displays the result of AddPermission method : " + ControlChars.Cr)
Console.WriteLine(socketPermission3.ToString())
'Find the intersection between two 'SocketPermission' objects.
socketPermission1 = CType(socketPermission2.Intersect(socketPermission3), SocketPermission)
Console.WriteLine("Displays the result of Intersect method :" + ControlChars.Cr + " ")
Console.WriteLine(socketPermission1.ToString())
'Demand that the calling method have the requsite socket permission.
socketPermission1.Demand()
Комментарии
Пересечение двух разрешений — это разрешение, которое помогает защитить ресурсы и операции, защищенные обоими разрешениями. В частности, он представляет минимальное разрешение таким образом, что любое требование, которое передает оба разрешения, также проходит их пересечение. Этот метод переопределяет Intersect и реализуется для поддержки IPermission интерфейса .