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Personally, I only use Assert when I have complete control of the call stack that is being walked. Keep in mind that Assert does not grant permission to a demand. The demand works as it normally would for that stack frame, so if that frame would normally have denied the permission the Assert point would also be denied permission. The actual code involved in an Assert is fairly simple: CodeAccessPermission ^permission = gcnew FileIOPermission(FileIOPermissionAccess::Read, "C:\\"); permission->Assert(); // Do stuff permission->RevertAssert(); Since only one Assert is allowed to be in effect at a time for a frame, you should make sure that you call the RevertAssert() method when you are done with your Assert. This basically turns off your Assert.

Message queuing is used primarily when you require true asynchronous messaging where the lifetimes of the client and the service might not overlap. Message queuing should also be used when you require reliability. In the real world, applications go down, and services are not always available, especially in scenarios where you face poor network infrastructures. WCF uses the underlying MSMQ technology to provide you with the means of leveraging the available technology to implement reliability, as you will see in the next section. Reliable messaging, as you have seen, does not provide you with a silver bullet. In particular, the WS-ReliableMessaging standard compliant implementation does not provide you with any durable storage for your messages. Using MSMQ, which is supported out of the box in WCF, allows you to overcome the infrastructure unreliability to a certain extent. Queuing enables you to effectively decouple the transport for the messages from their actual processing. Moreover, the reliability provided is really only as reliable as the underlying infrastructure in an environment where you do not have control over both endpoints of your application. Figure 8 1 shows conceptually what happens when using persistent stores to utilize the MSMQ communication between a WCF application and an MSMQ legacy application.

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As you ve seen in this chapter, unit testing is an integral part of any development process. Without unit tests, you cannot be assured that the code works as planned at the method level. In this chapter, you learned how to plan the unit tests and create them. This includes being able to prepare the development database so that tests are repeatable using the various methods of the test class. You learned how to manage and group test runs, as well as how to order test runs so that dependent tests run in the correct order. You have seen how to configure a test run to accomplish specific goals and the benefits of using code coverage and understanding what that coverage means. Then you learned how to run data-driven tests, which allow you to create a test database to supply values to your tests without having to create a myriad of different test methods for each method to be tested. Next, you learned about manual testing. Finally, we briefly covered the MSTest command-line tool. In short, this chapter has provided you with a new set of tools that you can use to make your code more stable than it has ever been before. This leads to fewer bugs, a shorter time to fix discovered bugs, and fewer regression bugs.

As I m sure you suspect, this form of override causes the current stack frame to be denied for the resource type specified. Using this override enables you to disable permissions for accessing resources even though the application is running under a code group that has a permission set with the appropriate permissions. CodeAccessPermission ^permissionRead = gcnew FileIOPermission(FileIOPermissionAccess::Read, "C:\\"); permissionRead->Deny(); // Do stuff permissionRead->RevertDeny(); The RevertDeny is used to restore the previous permissions to the specified resource. Note that if the resource was denied permissions before the Deny was called, then the resource continues to not have permission.

If you want to be specific with which resources are available on a stack walk, then the PermitOnly may be what you want. This override identifies the only resources that will have permissions on the call stack from the time the PermitOnly is specified to its corresponding RevertPermitOnly. CodeAccessPermission ^permissionWrite = gcnew FileIOPermission(FileIOPermissionAccess::Write, "C:\\"); permissionWrite->PermitOnly(); // Do Stuff permissionWrite->RevertPermitOnly(); Overrides can be a bit difficult to understand without an example. Listing 19-7 shows how you can use Deny and PermitOnly on the call stack and then have Assert overrule them.

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