OptionalFieldAttribute.cs

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namespace System.Runtime.Serialization;
 
[AttributeUsage(AttributeTargets.Field, Inherited = false)]
public sealed class OptionalFieldAttribute : Attribute
{
    private int _versionAdded = 1;
 
    public int VersionAdded
    {
        get
        {
            return _versionAdded;
        }
        set
        {
            if (value < 1)
            {
                throw new ArgumentException(SR.Serialization_OptionalFieldVersionValue);
            }
            _versionAdded = value;
        }
    }
}