WPF 解决 PathTooLongException 路径太长

        private void Button_OnClick(object sender, RoutedEventArgs e)
        {
            string str = "E:\\the long long path {0}.txt";
            str = string.Format(str, new string(Enumerable.Range(0, 300).Select(temp => 'x').ToArray()));
            var file = new FileInfo(str);
            using (var stream = file.CreateText())
            {
                stream.WriteLine("欢迎访问我博客 http://lindexi.gitee.io 里面有大量 UWP WPF 博客");
            }
        }

System.IO.PathTooLongException:“指定的路径或文件名太长，或者两者都太长。完全限定文件名必须少于 260 个字符，并且目录名必须少于 248 个字符。”

  <application xmlns="urn:schemas-microsoft-com:asm.v3">
      <windowsSettings xmlns:ws2="https://schemas.microsoft.com/SMI/2016/WindowsSettings">
          <ws2:longPathAware>true</ws2:longPathAware>
      </windowsSettings>
  </application>

        static void Main(string[] args)
        {
            var folder = Path.GetTempPath();

            for (int i = 0; i < 300; i++)
            {
                folder = Path.Combine(folder, i.ToString());
                Directory.CreateDirectory(folder);
            }

            var file = new FileInfo(Path.Combine(folder, "1.txt"));
            var fileStream = file.Create();
        }