10: Exception Handling in .NET

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constructors and properties that allow you to specify different required and optional values that relate to the SOAP fault representation A recommended pattern is for the service code to catch any exceptions and extract the relevant details for inclusion in a new instance An example of this is demonstrated in Listing 106
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Listing 106 Catching an Exception and Throwing a
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Using and to Extend Listing 105 is a good start, but it does not specify additional information constructor also supthat could be useful to the client The and arguments, used to specify the reason ports and code elements of the SOAP fault, respectively A code indicates There are three main options for the a problem with the message as sent by the caller This is the default code if A code indicates that none is supplied to the processing could not be completed because of an issue encountered by the service implementation Alternatively, a custom code can be provided
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The class is helpful for creating multiple reason messages featuring locale-based translations for localization of the application The SOAP 12 speci cation provides for multiple reason nodes, each feafor English in the United States) The turing a localeID (for example, class accepts a collection of instances, which themselves include strings of translations with locale identi ers In Listing 107, we revisit the sample code in Listing 106 and utilize the and classes to enhance the fault information we re serializing back to the caller
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Listing 107 Extending Using and
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Because the indicates a problem with the value that , so the was supplied to the service operation, we do not specify a will be used For the , we default of
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want to indicate that there was a service-related problem, so the static was used to create a code method In the catch-all section, we re demonstrating the use of the other constructors to provide translated error messages to the caller of entries is created, supplying transFirst, a generic is conlations and associated culture codes Then the constructor structed, including that list of translations with the class To access the translations on the client side, the property that features a exposes a method Call without arguments to automatically retrieve the translation for the current thread s as an argument to retrieve a speculture, or supply a speci c ci c translation
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Limitations of Basic
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Using the base class is a simple way to prevent unhandled exceptions from reaching the service host and potentially canceling your s sufsessions and invalidating the client proxy However, s, fer from a lack of identity If your service returns only you are making it dif cult for client application developers to create robust exception-handling logic Consider the example in Listing 108
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Listing 108 Processing Untyped
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Creating and Consuming Strongly Typed Faults
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The challenge here is that there is no subclass of that regions speci c to a set of scecan be used to create error handling narios The next best approach that the client application developer can take is writing code to investigate each exception at runtime to parse information from the properties to hopefully determine the correct course of recovery or processing
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As we just described, a basic does not provide a typeerror-handling logic on speci c way to create robust the client side To enable that kind of handling on the client, consider using class the generic-based accepts a type that de nes the structure of exception data being serialized This could be any type that can be serialized for transmission, but for the client to have strongly typed access to that type, it must have access to a de nition of that type from the example For example, we could use the In the in Listing 106 and throw a case where the client is a NET application, this would indeed work, each side having strongly typed access to the details of the However, what happens when a client based on non-NET technology, such as Java, attempts to use the service Java has no inherent knowledge of , so the Java proxy would not be able to provide NET s strongly typed access to the fault details our service may return To ensure interoperability, the WSDL for the service should describe the instance This is structure of the type used to create the done by providing a fault contract
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Declaring Fault Definitions with Remember that data contracts are used to de ne data structures that can be represented by a service s WSDL de nition, enabling a client to know exactly the types and structures of data to supply or process when interacting with a service Now we ll use the same concepts of data contracts to
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