SerializerException - The XML Serializer Cannot Resolve Type with Empty Name During TRDX Deserialization
Environment
| Product | Progress® Telerik® Reporting |
Description
When deserializing a TRDX report definition using ReportXmlSerializer.Deserialize(XmlReader) with a custom XmlReader, the following exception is thrown:
Telerik.Reporting.Serialization.SerializerException
Message=An error has occurred during serialization. The xml serializer cannot resolve type with name:Note that the type name in the error message is blank — the serializer fails to resolve a type, but no type name is printed.
Cause
The issue occurs when the XmlReader passed to ReportXmlSerializer.Deserialize is created without setting IgnoreWhitespace = true in the XmlReaderSettings.
Without this setting, the XmlReader returns whitespace-only text nodes between XML elements. The report serializer interprets these whitespace nodes as elements with an empty name and attempts to resolve a type from that empty string, which fails with the exception shown above.
When ReportXmlSerializer creates its own XmlReader internally (e.g., when deserializing from a Stream, TextReader, or file path), it automatically configures IgnoreWhitespace = true. However, when a pre-created XmlReader is passed directly, the serializer uses it as-is and relies on the caller to configure it correctly.
Solution
Set IgnoreWhitespace = true in the XmlReaderSettings before creating the XmlReader:
System.Xml.XmlReaderSettings settings = new System.Xml.XmlReaderSettings();
settings.IgnoreWhitespace = true;
using (System.Xml.XmlReader xmlReader = System.Xml.XmlReader.Create("MyReport.trdx", settings))
{
Telerik.Reporting.XmlSerialization.ReportXmlSerializer xmlSerializer =
new Telerik.Reporting.XmlSerialization.ReportXmlSerializer();
Telerik.Reporting.Report report = (Telerik.Reporting.Report)
xmlSerializer.Deserialize(xmlReader);
}Alternatively, use one of the ReportXmlSerializer overloads that accepts a Stream, TextReader, or file path directly, as these handle the XmlReaderSettings internally:
Telerik.Reporting.XmlSerialization.ReportXmlSerializer xmlSerializer =
new Telerik.Reporting.XmlSerialization.ReportXmlSerializer();
// Deserialize directly from a file path - no XmlReaderSettings needed
Telerik.Reporting.Report report = (Telerik.Reporting.Report)
xmlSerializer.Deserialize("MyReport.trdx");