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<Address> <Name>...</Name> <Street>...</Street> <City>...</City> <ZipCode>...</ZipCode> <State>...</State> <Country>...</Country> </Address> You do have the ability to shape this XML representation by adding attributes to your class. For example, you can rename elements or tell .NET to serialize a property as an attribute instead of an element. The XML elements are described with web services in 33, because web services use the same XmlSerializer. When deserializing your class, the XmlSerializer needs to be able to find a parameterless public constructor. In addition, none of your properties can be read-only. If you violate either of these rules, the deserialization process will fail. If you decide to use binary serialization instead of XmlSerialization, .NET uses a completely different approach. <add name="Address" type="Address" serializeAs="Binary"/> In this case, the ProfileModule enlists the help of the BinaryFormatter. The BinaryFormatter can serialize the full public and private contents of any class, provided the class is decorated with the Serializable attributes. (Additionally, any class it derives from or references must also be serializable.) You can learn much more about the binary formatter in 13. Finally, you can decide to use string serialization: <add name="Address" type="Address" serializeAs="String"/> In this case, you need a type converter that can translate between an instance of your class and its string representation. 28 shows you how to create type converters.

The ProfileModule that saves profile information isn t able to detect changes in complex data types (anything other than strings, simple numeric types, Boolean values, and so on). This means if your profile includes complex data types, the ProfileModule saves the profile information at the end of every request that accesses the Profile object. This behavior obviously adds unnecessary overhead. To optimize performance when working with complex types, you have several choices. One option is to set the corresponding profile property to be read-only (if you know it never changes). Another approach is to disable the autosave behavior completely by adding the automaticSaveEnabled attribute on the <profile> element and setting it to false, as shown here: <profile defaultProvider="SqlProvider" automaticSaveEnabled="false">...</profile> If you choose this approach, it s up to you to call Profile.Save() to explicitly commit changes. Generally, this approach is the most convenient, because it s easy to spot the places in your code where you modify the profile. Just add the Profile.Save() call at the end: Profile.Address = new Address(txtName.Text, txtStreet.Text, txtCity.Text, txtZip.Text, txtState.Text, txtCountry.Text); Profile.Save(); One final option is to handle the ProfileModule.ProfileAutoSaving event in the global.asax file. At this point, you can check to see if a save is really necessary and cancel the save if it isn t.

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With this technique, the obvious problem is determining whether the automatic save should be cancelled. You could store the original profile data in memory and then compare these objects with the current objects when the ProfileAutoSaving event fires. However, this approach would be awkward and slow. A better option is to make the page keep track of whether a change has been made. If a change has been made, your code can then set a flag to indicate that the update should go ahead. For example, consider the test page shown in Figure 24-3 that allows you to retrieve and modify address information.

One Django model can directly inherit from another, automatically creating a reference similar to the one used here. Since that also adds some extra ease-of-use options, you may be wondering why doesn t just inherit from directly. Model inheritance is best suited for situations where you won t be using the base model directly, because Django doesn t provide a way to add an inherited instance to existing models. In our case, that already exists in the database, we wouldn t be able to create a new based means that if a on it. Since there are many other applications, including Django s admin application, that might create users directly, we need to be able to create contacts for either new or existing users without any trouble. By using a explicitly, we re defining the exact same relationship that model inheritance would use, but without the different syntax that restricts us in this case. We lose a few of the syntax benefits that true inheritance provides, but those can be accommodated another way.

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