C# Firestore クラスにデータを取得する

[FirestoreData]
public class FSData
{
    [FirestoreProperty]
    public Timestamp AccessDate { get; set; }
    [FirestoreProperty]
    public double IdNumber { get; set; }
    [FirestoreProperty]
    public string Name { get; set; }
}
 

Google.Cloud.Firestore.DocumentReference docRef = db.Collection("users").Document("Test02");
DocumentSnapshot snapshot = await docRef.GetSnapshotAsync();
if (snapshot.Exists)
{
    FSData fSData = snapshot.ConvertTo<FSData>();
}