オブジェクトモデルの変更 - .NET SDK

public partial class Person : IRealmObject
{
    [PrimaryKey]
    [MapTo("_id")]
    public ObjectId Id { get; set; }
    public string FullName { get; set; }
    public int Age { get; set; }
}

public partial class Person : IRealmObject
{
    [PrimaryKey]
    [MapTo("_id")]
    public ObjectId Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }
}

public partial class Person : IRealmObject
{
    [PrimaryKey]
    [MapTo("_id")]
    public ObjectId Id { get; set; }
    public string FirstName { get; set; }
    public int Age { get; set; }
}

public partial class Person : IRealmObject
{
    [PrimaryKey]
    [MapTo("_id")]
    public ObjectId Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }
}

public partial class Person : IRealmObject
{
    [PrimaryKey]
    [MapTo("_id")]
    public ObjectId Id { get; set; }
    public string FullName { get; set; }
    public int Age { get; set; }
}

public partial class Person : IRealmObject
{
    [PrimaryKey]
    [MapTo("_id")]
    public ObjectId Id { get; set; }
    public string FullName { get; set; }
    public DateTimeOffset Birthday { get; set; }
}

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var config = new RealmConfiguration
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{
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    SchemaVersion = 4,
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    MigrationCallback = (migration, oldSchemaVersion) =>
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    {
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        var oldVersionPeople = migration.OldRealm.DynamicApi.All("Person");
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        var newVersionPeople = migration.NewRealm.All<Person>();
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        // Migrate Person objects
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        for (var i = 0; i < newVersionPeople.Count(); i++)
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        {
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            var oldVersionPerson = oldVersionPeople.ElementAt(i);
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            var newVersionPerson = newVersionPeople.ElementAt(i);
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            // Changes from version 1 to 2 (adding LastName) will
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            // occur automatically when Realm detects the change
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            // Migrate Person from version 2 to 3:
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            // Replace FirstName and LastName with FullName
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            // LastName doesn't exist in version 1
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            var firstName = oldVersionPerson.DynamicApi.Get<string>("FirstName");
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            var lastName = oldVersionPerson.DynamicApi.Get<string>("LastName");
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            if (oldSchemaVersion < 2)
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            {
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                newVersionPerson.FullName = firstName;
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            }
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            else if (oldSchemaVersion < 3)
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            {
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                newVersionPerson.FullName = $"{firstName} {lastName}";
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            }
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            // Migrate Person from version 3 to 4: replace Age with Birthday
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            if (oldSchemaVersion < 4)
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            {
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                var birthYear =
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                    DateTimeOffset.UtcNow.Year - oldVersionPerson.DynamicApi.Get<int>("Age");
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                newVersionPerson.Birthday =
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                    new DateTimeOffset(birthYear, 1, 1, 0, 0, 0, TimeSpan.Zero);
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            }
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        }
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    }
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};
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var realm = Realm.GetInstance(config);