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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.runtime.serialization.optionalfieldattribute below:

OptionalFieldAttribute Class (System.Runtime.Serialization) | Microsoft Learn

Specifies that a field can be missing from a serialization stream so that the BinaryFormatter and the SoapFormatter does not throw an exception.

public ref class OptionalFieldAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)]
public sealed class OptionalFieldAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class OptionalFieldAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)>]
type OptionalFieldAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type OptionalFieldAttribute = class
    inherit Attribute

Public NotInheritable Class OptionalFieldAttribute
Inherits Attribute

Inheritance

Attributes

This attribute allows you to specify that new fields in a serializable type (a type to which the SerializableAttribute is applied to) are ignored by the BinaryFormatter or the SoapFormatter. This enables version-tolerant serialization of types created for older versions of an application that serializes data. For example, when the formatters encounter a stream produced by a version that does not include the new fields, no exception is thrown, and the existing data on the older type is processed as normal.

When implemented in a derived class, gets a unique identifier for this Attribute.

Gets or sets a version number to indicate when the optional field was added.

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

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