从 xamarin forms 中的 base64 下载文件

Question

I'm trying to download a file (that can be either image or PDF) that I've saved in my DB. I get the file in a string format, so I want to download this file. The problem is, I don't get any error, it just doesn't show the downloaded file on its folder. Here is what I have so far.

                string caminho = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
                string caminho_arquivo = Path.Combine(caminho, nome_arquivo);
                var decoded = Encoding.UTF8.GetString(Convert.FromBase64String(arquivo.arquivo));
                File.WriteAllText(caminho_arquivo, decoded);

Answer 1

The code below:

  string caminho = Environment.GetFolderPath(Environment.SpecialFolder.Personal);

would show the path like:

"/data/user/0/packagename/files/filename"

In Internal Storage, you couldn't see the files without root permission.

But you could use the code to check the file exist or not in the internal storage.

  if (File.Exists(caminho_arquivo))
        {

        }

If you want to view it, you could use adb tool. Please refer to the way in the link about the adb tool. How to write the username in a local txt file when login success and check on file for next login?