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The LinkDemand does not have the overhead that the Demand has. It only checks the immediate call to the permission secured area; once the check passes, no subsequent checks are made. In other words, no stack walk occurs and the check is done only once no matter how many times the call is made. The code to implement LinkDemand is virtually the same as Demand: [ReflectionPermissionAttribute(SecurityAction::LinkDemand, Unrestricted=true)] void LinkDemandReflectionOperation() { } You need to be careful when using LinkDemand, because even though the call is faster, any code that passes the test and thus can reference your code can potentially break security by allowing malicious code to call using the authorized code. I don t feel the speed gain is worth this possible security problem, so I always use Demand. On the other hand, if you have complete control of the call stack then LinkDemand might work well for you.

There are two forms of InheritanceDemand. The first is as a class attribute. When used in this form, all classes that inherit from this declaratively secured class must also have the specified permissions. [ZoneIdentityPermissionAttribute(SecurityAction::InheritanceDemand, Zone=SecurityZone::Internet)] public ref class InheritanceDemandZoneIdentityClass { } The second form is an attribute on the virtual method. In this scenario, a class must have the specified permissions of the virtual method to be able to override the virtual method. public ref class InheritanceDemandClass { public: [ZoneIdentityPermissionAttribute(SecurityAction::InheritanceDemand, Zone=SecurityZone::Internet)] virtual void InheritanceDemandZoneIdentityMethod() { } }

The test will be run once for every row of data in the table. The DataRow property of the testContextInstance changes for every method according to the DataSource attribute for the method.

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Listing 8 2. ITradeService Changes [ServiceContract(SessionMode=SessionMode.Allowed)] public interface ITradeService This change will ensure that the messages are delivered in the order you intended. That is practically all you need to do to ensure that you avoid the scenario where messages are received out of order. You now need to make the same change to the definition of ITradeService in the client, as shown in Listing 8 3. Listing 8 3. Modifying ITradeService < xml version="1.0" encoding="utf-8" > <configuration> <system.serviceModel> <client> <endpoint address="http://localhost/servicemodelsamples/service.svc" binding="wsHttpBinding" bindingConfiguration="Binding1" contract="Microsoft.ServiceModel.Samples.ICalculator" /> </client> <!-- binding configuration - configures WSHttp binding for reliable sessions --> <bindings> <wsHttpBinding> <binding name="Binding1"> <reliableSession enabled="true" /> </binding> </wsHttpBinding> </bindings> </system.serviceModel> </configuration> You will now modify the App.config file of the host project to incorporate the implementation of the WS-ReliableMessaging standard as implemented in the WCF framework. You can do this by doubleclicking the App.config file in the IDE or by simply opening it in Windows Notepad. Add the lines shown in Listing 8 4 to the file. Listing 8 4. Modifying the Service Host App.config File < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <!-- use appSetting to configure base address provided by host --> <add key="baseAddress" value="http://localhost:8000/TradeService" /> </appSettings> <system.serviceModel> <services>

Requesting permissions is a different approach to handling permission in code access security. Instead of letting the code run up to the point where the permission is demanded, request permissions don t even let the assembly load into memory. You apply requests using declarative syntax on the assembly. That way, the CLR can check at the time when the assembly is loading to see if the appropriate permissions are satisfied. If the permissions requested are not satisfied by the evidence, then the assembly itself does not load.

The test results from a data-driven test look slightly different than those you ve seen so far, as shown in Figure 12-15.

The RequestMinimum is an all-or-nothing proposition for an assembly. It is the permission that the code must have to run. The failure to have the permissions causes the CLR to not load the assembly. using using using using namespace namespace namespace namespace System; System::IO; System::Security; System::Security::Permissions;

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