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copied!<p>Yes, GetSchema() <a href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.ixmlserializable.getschema.aspx" rel="noreferrer">should return null</a>.</p> <blockquote> <p>IXmlSerializable.GetSchema Method This method is reserved and should not be used. When implementing the IXmlSerializable interface, you should return a null reference (Nothing in Visual Basic) from this method, and instead, if specifying a custom schema is required, apply the XmlSchemaProviderAttribute to the class.</p> </blockquote> <p>For both read and write, the object element has already been written, so you don't need to add an outer element in write. For example, you can just start reading/writing attributes in the two.</p> <p>For <a href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.ixmlserializable.writexml.aspx" rel="noreferrer">write</a>:</p> <blockquote> <p>The WriteXml implementation you provide should write out the XML representation of the object. The framework writes a wrapper element and positions the XML writer after its start. Your implementation may write its contents, including child elements. The framework then closes the wrapper element.</p> </blockquote> <p>And for <a href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.ixmlserializable.readxml.aspx" rel="noreferrer">read</a>:</p> <blockquote> <p>The ReadXml method must reconstitute your object using the information that was written by the WriteXml method.</p> <p>When this method is called, the reader is positioned at the start of the element that wraps the information for your type. That is, just before the start tag that indicates the beginning of a serialized object. When this method returns, it must have read the entire element from beginning to end, including all of its contents. Unlike the WriteXml method, the framework does not handle the wrapper element automatically. Your implementation must do so. Failing to observe these positioning rules may cause code to generate unexpected runtime exceptions or corrupt data.</p> </blockquote> <p>I'll agree that is a little unclear, but it boils down to "it is your job to <code>Read()</code> the end-element tag of the wrapper".</p>

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