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Serialization can be classified based on the format of serialization or on the depth of serialization. The three formats in which you can serialize data in the .NET Framework are as follows: Binary: This format is generally better in terms of performance than the others. However, in terms of extensibility and cross-application integration, the other formats are better. XML: Objects serialized in this way are stored as plain XML. If you are talking with multiple heterogeneous systems, this format will prove useful. For example, your .NET applications may serialize objects as XML documents, and a Java application may read these serialized objects by using its standard XML parser and work with the data further. Simple Object Access Protocol (SOAP): Objects serialized in this way store information as per the SOAP standards. SOAP is the core pillar for web services. The other way to classify serialization is based on the depth of serialization. The two flavors based on the depth of serialization are as follows: Deep serialization: This serializes all the public, protected, and private members of your class. Even the nested classes and their public, protected, and private members are serialized. Shallow serialization: This serializes only the public members of your class. In the .NET Framework, the classes that serialize objects in binary format use deep serialization, whereas the classes that serialize objects in XML format use shallow serialization.

Adding the three standard window states available to a portlet into this already complex situation makes things very much worse. Clearly an alternative approach is required.

<Rectangle Width="200" Height="128" Canvas.Left="8" Canvas.Top="8"> <Rectangle.Fill> <RadialGradientBrush GradientOrigin="0.2, 0.2"> <GradientStop Color="#FF000000" Offset="0"/> <GradientStop Color="#FFFFFFFF" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle>

There are three core classes that are used to perform serialization in binary, XML, and SOAP formats, respectively: The BinaryFormatter class serializes objects in binary format. It resides in the System.Runtime.Serialization.Formatters.Binary namespace. The XmlSerializer class serializes objects in XML format. It resides in the System.Xml. Serialization namespace. The System.Xml.Serialization name- space physically resides in the System.Xml.dll assembly. The SoapFormatter class serializes objects in SOAP format. It resides in the System. Runtime.Serialization.Formatters.Soap namespace. The System.Runtime.Serialization. Formatters.Soap namespace physically resides in the System.Runtime.Serialization. Formatters.Soap.dll assembly.

When the behavior of your application requires a great deal of branching dependent on business requirements, you are essentially coding business rules into your system. For example, the very first condition we encounter states in essence is Unidentified users should see the default portlet. Taking the remaining rules in our example, we end up with a set of quite simple statements about how the application should behave: Administrators should see the administrator tools. Key account managers should see the KAM tools. Support staff should see the support tools. Helpdesk staff should see the helpdesk tools. Customers should see customer tools. KAM tools include customer tools. Support tools include customer tools. Helpdesk tools include customer tools. This breakdown of the rules is obviously quite programmatic in nature, but it s also close to the way that nontechnical people might think and speak about the business requirements for the portlet that a key account manager should have access to the customer tools (perhaps to place bids on behalf of a client), but that the administrator who is concerned with determining who is on the helpdesk and who is an account manager and so forth should not. This technique of rules-based programming is well established, and free tools are available that can help you to accomplish this. The resulting system takes on the form shown in Figure 11-2.

The SpreadMethod allows you to determine how the gradient repeats. It can be set to one of three values: Pad is the default, and it means that the gradient fades evenly between colors, and that the bounding rectangle is filled with the last color on the gradient; Reflect means that once the gradient is filled, it is reversed to fill in the remainder; and Repeat means that once the gradient is filled, it is repeated. These are particularly useful when used in combination with the RadiusX and RadiusY properties. Here s an example of a RadialGradientBrush using the Reflect value in the SpreadMethod:

11

Now that you have a basic understanding of what serialization is, let s delve straight into XML serialization. You will be building an application that illustrates the serialization and deserialization process by using the XmlSerializer class. The application user interface is shown in Figure 8-1.

Figure 11-2. Bringing rules into the display logic The information available to the system, such as the user attributes, the user s role memberships, and other information not shown such as the window state, is combined with the business rules to generate the output. Most of the solutions available for applying rules-based techniques allow you to create your own business semantics for describing business rules. The following XML fragment shows the sort of approach that might be applied to our example problem:

<Rectangle Width="200" Height="128" Canvas.Left="8" Canvas.Top="8"> <Rectangle.Fill> <RadialGradientBrush SpreadMethod="Reflect"> <GradientStop Color="white" Offset="0"/> <GradientStop Color="gray" Offset="0.5"/> <GradientStop Color="black" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle> RadiusX and RadiusY are used to set the desired radius of the gradient. The default value of this is 0.5, so specifying a value less than this will mean that multiple gradients will be used in the fill. This is probably best shown by example: <Rectangle Width="200" Height="128" Canvas.Left="8" Canvas.Top="8"> <Rectangle.Fill> <RadialGradientBrush RadiusX="0.1" RadiusY="0.1" SpreadMethod="Reflect"> <GradientStop Color="#FF000000" Offset="0"/> <GradientStop Color="#FFFFFFFF" Offset="1"/> </RadialGradientBrush> </Rectangle.Fill> </Rectangle>

<display> <tools> <role>Administrator</role> <output>Administrator</output> </tools> <tools> <role>KeyAccountManager</role> <output>KeyAccountManager,Customer</output> </tools> <tools> <role>Support</role> <output>Support,Customer</output>