シリアライズしてXMLにできる（Privateのみ出力できない）

    public class XmlHelper<T> where T : class
    {
        public string TargetPath { get; set; }
        private Encoding encoding => System.Text.Encoding.GetEncoding("shift_jis");
 
    public XmlHelper(string targetPath)
    {
        TargetPath = targetPath;
    }
 
    public XmlHelper() : base()
    {
    }
 
    public void Save(T data)
    {
        var serializer = new XmlSerializer(typeof(T));
        using (var writer = new StreamWriter(TargetPath, false, encoding))
        {
            serializer.Serialize(writer, data);
            writer.Close();
        }
    }
 
    /// <summary>
    /// XMLファイルを読み込む
    /// </summary>
    public T Read()
    {
        var serializer = new XmlSerializer(typeof(T));
        T obj;
        using (var reader = new StreamReader(TargetPath, encoding))
        {
            obj = (T)serializer.Deserialize(reader);
            reader.Close();
        }
        return obj;
    }
}