ShouldSerialize() vs. *Specified*: Which Conditional Serialization Pattern Should I Choose?

ShouldSerialize() vs Specified Conditional Serialization

Problem

Despite being aware of both ShouldSerialize and Specified patterns, one may wonder if there are differences between them. Are there potential issues when using one pattern over the other, especially when specific conditions require conditional serialization?

Solution

Intent of *Specified Pattern

The *Specified pattern is documented to support XSD schema elements where:

• is used.
• minOccurs is zero.
• maxOccurs dictates a single instance.
• The data type converts to a value type.

In this scenario, xsd.exe automatically generates a {propertyName}Specified property to track whether the element was encountered in the XML and should be serialized back.

Relationship with XSD Generation

If a type has a property with a matching {propertyName}Specified pattern, xsd.exe generates an appropriate minOccurs in the corresponding schema.

Gotchas of *Specified Pattern

• Properties can be lost during serialization if their corresponding Specified properties are not set to true.
• Some serializers may not support this pattern, requiring manual suppression or setting during serialization and deserialization.
• A missing {propertyName}Specified setter may cause exceptions in certain .Net versions.

ShouldSerialize*() Method

This method is documented in the Windows Forms section of MSDN, suggesting semi-hidden functionality.

Advantages of ShouldSerialize*()

• It is a method, not a property, avoiding the gotchas of the *Specified pattern.
• It seems more popular and is adopted by other serializers, such as Json.NET and protobuf-net.

Recommendations

• If xsd.exe generates a {propertyName}Specified property or tracking is needed for optional elements in the schema, use the *Specified pattern, considering its potential issues.
• Otherwise, the ShouldSerialize*() pattern is recommended due to its lack of gotchas and wider support.

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