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Listing 4-13 shows the correct order of catching exceptions of derived exception class, but this time they are all derived from the System::ApplicationException class. You might want to change the order of the catch blocks to see what happens. Listing 4-13. MultiException.exe: Catching Multiple Exceptions using namespace System; /// <Summary>Base Class</Summary> ref class LevelOneException : public ApplicationException { public: LevelOneException( String ^err ); }; LevelOneException::LevelOneException(String ^err) : ApplicationException(err) { } /// <Summary>Inherited Class</Summary> ref class LevelTwoException : public LevelOneException { public: LevelTwoException( String ^err ); }; LevelTwoException::LevelTwoException(String ^err) : LevelOneException(err) { } /// <Summary>Catching multiple exceptions</Summary> void main() {

Caution The validation rules operate on the response, not the request, even though they are associated

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for (int i = 0; i < 4; i++) { Console::WriteLine("Start Loop"); try { if (i == 1) throw gcnew ApplicationException("\tBase Exception Thrown"); else if (i == 2) throw gcnew LevelOneException("\tLevel 1 Exception Thrown"); else if (i == 3) throw gcnew LevelTwoException("\tLevel 2 Exception Thrown"); Console::WriteLine("\tNo Exception"); } catch (LevelTwoException ^e2) { Console::WriteLine(e2->Message); Console::WriteLine("\tLevel 2 Exception Caught"); } catch (LevelOneException ^e1) { Console::WriteLine(e1->Message); Console::WriteLine("\tLevel 1 Exception Caught"); } catch (ApplicationException ^e) { Console::WriteLine(e->Message); Console::WriteLine("\tBase Exception Caught"); } Console::WriteLine("End Loop"); } } Figure 4-7 shows the results of this little program.

// Complete the transaction scope.Complete(); ... } As you have seen, you add a transaction scope around the DoTrade method in order to have the service use the NetMSMQ binding correctly. You will learn more about transactions in the next chapter. Next, you modify the App.config file for the client in order to use MSMQ, as per Listing 8 9. Listing 8 9. Modifying the Client App.config File < xml version="1.0" encoding="utf-8" > <configuration> <system.serviceModel> <bindings> <netMsmqBinding> <binding name="NetMsmqBinding_ITradeService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" deadLetterQueue="System" durable="true" exactlyOnce="true" maxReceivedMessageSize="65536" maxRetryCycles="2" receiveErrorHandling="Fault" receiveRetryCount="5" retryCycleDelay="00:30:00" timeToLive="1.00:00:00" useSourceJournal="false" useMsmqTracing="false" queueTransferProtocol="Native" maxBufferPoolSize="524288" useActiveDirectory="false"> <readerQuotas maxDepth="32" maxStringContentLength= "8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount= "16384" /> <security mode="Transport"> <transport msmqAuthenticationMode="None" msmqProtectionLevel="None" /> <message clientCredentialType="Windows" /> </security> </binding> </netMsmqBinding> </bindings> <client> <endpoint address="net.msmq://localhost/private/ TradeQueue" binding="netMsmqBinding" bindingConfiguration="NetMsmqBinding_ITradeService" contract="ITradeService" name="NetMsmqBinding_ITradeService" /> </client> </system.serviceModel> </configuration>

The level option indicates the threshold the validation rule will be tested at during a load test. For example, if the validation rule level is set to Low and the load test validation level is set to Medium or High, then the validation rule will not be checked (this is discussed in a little more detail in 16).

If you want to correctly code C++/CLI code, which is used in a multilanguage environment, then the easiest way of catching all exceptions is simply to add the catching of System::Exception to the end of your catch block, because all .NET exceptions of both system and application origin are derived from this class. There is also another way of catching all uncaught exceptions, even those not derived from System::Exception. It is simply a catch block without an exception call. In the class s place is an ellipsis: catch (...) { }

Creating a custom validation rule is almost identical to creating a custom extraction rule. To do this, you follow the same steps outlined previously in the Creating Custom Extraction Rules section except that instead of inheriting from the base ExtractionRule or one of its derivatives, you inherit from the base ValidationRule class or one of its derivatives. In this case, you would override, in addition to the RuleName property, the Validate method.

The catch(...) block is an unsafe coding construct. You can only throw or catch handles to a ref class with /clr:safe.

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