


ShouldSerialize() vs. Specified: Which Conditional Serialization Pattern Should You Choose?
Conditional Serialization in XmlSerializer: ShouldSerialize() vs. Specified
Introduction
XmlSerializer provides two approaches for conditionally serializing properties: the ShouldSerialize*()
method and the *Specified
property. This article compares these methods, highlighting their differences, subtleties, and best-use cases.
The *Specified Property
The {propertyName}Specified
property is designed to track whether a property was present in the XML input. This is particularly relevant when the XSD schema defines minOccurs=0
and maxOccurs=1
for a value-type property. If the element is found, {propertyName}Specified
is set to true
, indicating serialization is needed.
The ShouldSerialize* Method
The ShouldSerialize{PropertyName}()
method offers a more flexible approach to conditional serialization. Unlike *Specified
, which is tied to XSD schema constraints, this method allows for custom logic to determine whether a property should be serialized, returning true
for serialization and false
otherwise.
Key Differences and Potential Issues
{propertyName}Specified Considerations:
- Automatically generated by
xsd.exe
, potentially leading to unexpected behavior. - Can result in data loss if properties are set but corresponding
Specified
properties are not. - May require extra handling for serializers other than XmlSerializer.
ShouldSerialize* Considerations:
- Lacks a setter for the property, potentially causing problems in specific scenarios.
- Serializer compatibility isn't guaranteed across all serialization libraries.
Choosing the Right Method
-
Use
{propertyName}Specified
:- When
xsd.exe
automatically generates the property. - To track unambiguous element presence in XML input.
- When generating XSD to define optional values.
- When
- *Use `ShouldSerialize()`:**
- In most other situations.
- When custom conditional serialization logic is required.
- For better compatibility with various serializers.
Conclusion
Both ShouldSerialize*()
and *Specified
enable conditional serialization, but their scope and potential drawbacks differ. Understanding these nuances is crucial for selecting the most suitable approach based on your specific serialization needs.
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