Employee Surrogate Class in .NET framework

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Listing 627 Employee Surrogate Class
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6: Serialization and Encoding
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Listing 627 continued
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Serializing Type s Using Surrogate s
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6: Serialization and Encoding
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Listing 627 continued
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We put this all together by letting the know about the surrogate class You need to instantiate the and pass in the class to the constructor, as shown in Listing 628
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Listing 628 Using the Employee Surrogate Class with the
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Serializing Type s Using Surrogate s
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6: Serialization and Encoding
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Streaming Large Data
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WCF supports two modes for processing messages: buffered and streamed Buffered mode is the default way in which WCF processes messages In this mode, the entire message is in memory before it is sent or after it is received In most scenarios, buffering of messages is suf cient and is sometimes required to support features such as reliable messaging and digital signatures However, buffering large messages can easily exhaust system resources and limit scalability WCF supports another mode for processing messages using streaming In this mode, data is sent between client and Streaming is typically enabled on either server using a a binding or a transport channel Listing 629 shows how to enable streambinding by setting the attribute on ing on the the binding con guration The acceptable values for the attribute are , , , and This allows for granular control of streaming between the client and the server
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Listing 629 Enabling Streaming on
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To take advantage of streaming, the operation contract needs to use an or return a message contract that uses a instance of a stream Listing 630 shows an example of a le download service contract that returns a
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Listing 630 Service Contract
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Streaming does not work in all scenarios where large amounts of data are being used For example, if reliable messaging, digital signatures, or resuming after failure are needed, streaming is not acceptable In these scenarios, manually chunking the data into small messages and sending many small messages that eventually get reconstituted by the recipient is preferred This can easily be layered on top of WCF
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for Custom Serialization
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The is the preferred serialization mechanism in WCF However, at times you might want to go beyond the default serialization One option to change the serialization is to work with the There are many reasons to use the , including the capability to implement custom serialization, sharing of types, and , support for legacy Web services As with the is an integral part of WCF This section looks at the the and discusses how it can be used to shape the resulting XML output always serializes data using XML eleThe ments rather than XML attributes Listing 631 shows an instance of an Employee class using the
6: Serialization and Encoding
Listing 631 Serialized Employee Instance Using Serialization
Examining the serialized XML, you can see that the data contract could be rewritten using XML attributes An example using XML attributes rather than XML elements is shown here:
XML attributes are not possible using the The does offer limited control of the XML by allowing attribthe names of XML elements to be speci ed using the is essentially the same as the ute The but with support for sharing type information This is the only serializer where you can commeans that the pletely control output of serialization Listing 632 shows a schema for the class using XML attributes
Listing 632 Employee XSD Schema
Custom XmlSerialization Using Attributes You can shape the XML output using the in two ways The rst and most direct approach is to use the attributes provided in the NET
Using the
for Custom Serialization
Framework under the namespace to instruct how to shape the XML output By default, the the will output public elds and public read/write properties as XML elements These can be changed to XML attributes by attributing attribute Also, the is an optthem with the will serialize public out serialization model By default the elds and public read/write properties unless instructed not to do so with attribute Additional attributes, such as the , the , , and attributes, help instruct the how to serialize types
Custom Using The second approach to using the is to use the interface, which is generally used in advanced scenarios where intercomplete control over serialization is needed The , , and With face supports three methods: method was deprecated and replaced with the NET 20, the attribute The other two methods are and These methods correspond to methods used to deserialize and serialize from and to XML Listing 633 demonstrates this