How to Properly Implement IXmlSerializable in .NET?

Correctly implement the IXmlSerializable interface in .NET

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

GetSchema() method

GetSchema() methods should return null. The documentation for the IXmlSerializable interface clearly states that it should be null and if you need a custom schema, you should use the XmlSchemaProviderAttribute attribute on the class.

ReadXml() method

Advance the reader to the next element before returning. This is because the framework automatically handles wrapping elements, but it is the implementer's responsibility to handle the closing element tag.

WriteXml() method

Avoid writing the root element for objects. The framework positions the writer to the beginning of the wrapped element, and the implementer writes its content.

Sub-object

Treat child objects as regular members of the parent object. They should be read/written in the parent object's WriteXml and ReadXml methods.

Example implementation

<code class="language-csharp">public class MyCalendar : IXmlSerializable
{
    // ...

    public void ReadXml(XmlReader reader)
    {
        reader.MoveToElement();
        _name = reader.GetAttribute("Name");
        // ...

        reader.ReadToDescendant("MyEvent");
        while (reader.NodeType != XmlNodeType.EndElement)
        {
            MyEvent evt = new MyEvent();
            evt.ReadXml(reader);
            _events.Add(evt);
            reader.MoveToContent();
        }
        reader.ReadEndElement();
    }

    public void WriteXml(XmlWriter writer)
    {
        writer.WriteAttributeString("Name", _name);
        // ...

        foreach (MyEvent evt in _events)
            evt.WriteXml(writer);
    }
}</code>

By following these guidelines, you can ensure that you implement correct and consistent IXmlSerializable interfaces for your objects in .NET.

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