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Listing 633 Employee Class Using XML Serialization
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6: Serialization and Encoding
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Listing 633 continued
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The result of using the is that we can work with XSD schemas as the starting point for our contracts The drawback to this approach is that there could potentially be much more code to write
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At the beginning of this chapter we mentioned that there are two steps in WCF to prepare an object for transmission over a network The rst step is serialization, which takes an object graph and transforms it into an XML Infoset The second step is encoding, which takes an XML Infoset and transforms it into a set of bytes that can be sent across a network WCF provides
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6: Serialization and Encoding
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three types of encoding: text, binary, and MTOM This section focuses on when to use each of these encoders
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Text Versus Binary Encoding Prior to WCF, you had a number of choices for building distributed applications Two of those options were NET Remoting and ASPNET Web Services NET Remoting was great for communicating between NET applications because it optimized the transmission of data using binary encoding This offered better performance than ASPNET Web Services, which leveraged text encoding for interoperability Text encoding was acceptable for ASPNET Web Services because it allowed for interoperability across platforms WCF abstracts out the encoding mechanism and allows for bindings that allow for both styles of encoding This allows WCF to provide functionality that replaces both NET Remoting and ASPNET Web Services Encoding is not something that you work with directly Instead, it is speci ed by the binding used to expose a service 4, Bindings, highlighted bindings for use between NET applications and those used binding, which is used between for interoperability The encoder The NET applications, leverages the encoder offers the best performance, but it does not support interoperability Conversely, bindings such as the binding use the encoder, which offers interoperability using the WS-* speci cations Listing 634 shows an example of a encoder custom binding using the
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Listing 634 Custom Binding Using
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Listing 635 shows the con guration of a custom binding using the encoder
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Sending Binary Data Using MTOM Encoding encoder converts messages into text-based The XML This is great for interoperability, but it is not ef cient at transmitting large chunks of binary data MTOM is used to send large amounts of binary data as raw bytes in interoperable scenarios As mentioned previously, MTOM refers to Message Transmission Optimization Mechanism This is standard for optimizing the binary data by sending the binary data
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6: Serialization and Encoding
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as attachments to the SOAP message This means that binary data can be transmitted using a SOAP message without the overhead of Base64 text encoding To bene t from the use of MTOM, a service must contain a byte object in the operation contract array or a WCF provides support for MTOM through the encoder The use of the encoder is typically speci ed by the binding Listing 636 shows how to specify the MTOM encoder using binding the
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Listing 636 Using
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Getting to Know the The encoder is available with WCF in NET Framework 35 and provides support for JSON and POX encoding This encoder does not provide a speci c type of encoding, but aggregates a set of encodencoder ing styles that are used on the Web today The or the is enabled by using either the endpoint behaviors endpoint behavior instructs the The encoder to use the encoder This is done interencoder and setting the message nally by using the This instructs the version to
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Summar y
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encoder to not include any SOAP or WS-Addressing information in the encoder supports request and XML output The responses messages in either XML or JSON The default for the endpoint behavior is to have the request and response message This can be controlled in code by setformats set to attribting the request and/or response message formats on the or ute to Although both the request and response formats can be speci ed independently, they are typically set to the same value The endpoint behavior does exactly this by setting the default This in for the request and response formats to encoder to use the turn instructs the encoder to encode messages The is used for AJAX-enabled Web applications that call services from JavaScript It also enables support for ASPNET AJAX client proxies Refer to 13 for more information on the behavior, behavior, and the attribute