我可以从Xamarin App创建公共/永久文件吗？

using System;
using System.IO;

public static class FileHelper
{
    public static void CreatePublicFile(string fileName)
    {
        string filePath = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.Path, fileName);

        using (StreamWriter writer = File.CreateText(filePath))
        {
            writer.WriteLine("This is a public file created using Xamarin.");
        }
    }
}

using System;
using System.IO;

public static class FileHelper
{
    public static void CreatePermanentFile(string fileName)
    {
        string filePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), fileName);

        using (StreamWriter writer = File.CreateText(filePath))
        {
            writer.WriteLine("This is a permanent file created using Xamarin.");
        }
    }
}