How to Correctly Implement the IXmlSerializable Interface?

In-depth understanding of the correct implementation of the IXmlSerializable interface

Proper implementation of the IXmlSerializable interface requires following specific rules and best practices.

GetSchema() method rules:

Contrary to popular belief, GetSchema() methods should return null. As the documentation states: "When implementing the IXmlSerializable interface, this method should return a null reference."

ReadXml/WriteXml method guide:

For the ReadXml and WriteXml methods:

• When reading, it is assumed that the outer element containing the object data has been written and should not be added when writing.
• ReadXmlImplementations should read from the beginning of the wrapped element until the end, inclusive.
• WriteXmlImplementations should write the XML representation of the object within the wrapping element, excluding outer elements.

Handling sub-objects:

When serializing a complex object containing sub-objects:

• Each child object should be represented as a separate XML element within the wrapping element.
Both
• ReadXml and WriteXml methods should handle sub-objects by implementing the IXmlSerializable interface for each subtype and calling ReadXml/WriteXml recursively as needed.

Example implementation:

Sample code is provided that demonstrates these principles:

The
• GetSchema() method returns null.
• ReadXmlMoves to the first element and starts reading from the wrapper element.
• WriteXmlWrite attributes without wrapping them in an outer element.

corresponding XML:

The corresponding XML shown is correct, each object element (MyCalendar, MyEvent) has its own set of properties.

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