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Exceptions also have to be thrown within a try block, or they will immediately terminate without searching for a handler The try block is simply a block of code enclosed in curly brackets and prefixed with the keyword try: try { // code body where exception can be thrown } After the try block are one or more catch blocks Each catch block handles a different type of error A catch block looks similar to a function with one parameter, except that the function name is always catch, there is no return type, and the parameter is the exception type to trap catch (ExceptionType e1) { // code to handle exception } // repeat for all specific exception types catch (ExceptionType eN) { // generic code to handle exception } Listing 4-10 shows a simple example of an exception.

I noted in 3 that the safe_cast operator throws a System::InvalidCastException when it is unable to convert from one try to another This coding example shows how to capture this exception so that it can be handled more elegantly than the abrupt termination that would normally happen The safe_cast operator is actually to smart to be used directly as it knows that class X and class Y are not related, so I had to use the C-cast style type cast, which internally uses the safe_cast operator Listing 4-10 CatchExceptionexe: Simple Exception Handling Example using namespace System; ref class X {}; ref class Y {}; void main() { X ^x = gcnew X; try { Y ^y = (Y^)x; Console::WriteLine("No Exception"); } // Should not execute.

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Based on these rules, there are very few reasons you would want to code a custom extraction rule. One reason is that you have a very complex regular expression and want to code it into an extraction rule or for some other reason such as to encourage reuse when dealing with web tests. To add an existing extraction rule to a test, right-click a request node and select Add Extraction Rule. This will display the dialog box shown in Figure 15-9.

On a mesh, each node needs to be identified by a unique ID, usually called a peer ID or mesh ID. To resolve these peer IDs to their corresponding Internet addresses, the Peer Name Resolution Protocol (PNRP) is used (instead of DNS). Each peer node can have its own peer ID, irrespective of the node s type (computer, user, group, device, service, etc.). This list of IDs is distributed among the peers using a multilevel cache and referral system that allows name resolution to scale to billions of IDs while requiring minimal resources on each node. An endpoint is defined as a combination of a peer ID, port number, and communication protocol. Using an endpoint, data can be sent between nodes in two ways. One of these is for a peer to directly send the data to another peer. The other is for a peer to send the data to all the other peers on the same mesh; this is also known as flooding. A flooded message could arrive at the same peer multiple times via different routes on the mesh.

catch (InvalidCastException ^e) { Console::WriteLine("Invalid Cast Exception"); Console::WriteLine(e->StackTrace); }

As with the validation rule demonstrated in the Data-Driven Web Testing section of this chapter, any field available here can be bound to a data source. Each extraction rule has various different properties. One of the properties that you will find most useful is the Required property (if the rule has this property). Setting it to True indicates that the information the rule is trying to extract must exist or else the test will fail. The Context Parameter Name value is a value available to all extraction rule tests. Providing a value here requires that you have previously created a context parameter.

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