如果编 码内存流

Question

  
 string string_7 = Application.StartupPath + "\\license.A";
        string string_13 = "BGCQURAF";  string bb = Base64Decode("utf-8", method_65(string_7, string_13));
            textBox1.Text = bb;请教如果写入新的strin7  字符串到
  
 string string_5 = Application.StartupPath + "\\license5.A";把文件写到BB
怎么回写到新的LICENSE5.A
private string method_65(string string_17, string string_18)
        {
            try
            {
                string s = "＃sb≡mht＃";
                FileStream stream = new FileStream(string_17, FileMode.Open, FileAccess.Read);
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                provider.Key = Encoding.ASCII.GetBytes(s);
                provider.IV = Encoding.ASCII.GetBytes(string_18);
                ICryptoTransform transform = provider.CreateDecryptor();
                CryptoStream stream2 = new CryptoStream(stream, transform, CryptoStreamMode.Read);
                string str2 = new StreamReader(stream2, new UnicodeEncoding()).ReadToEnd();
                stream2.Close();
                stream.Close();
                return str2;
            }
            catch
            {
                return "";
            }        }

Answer 1

以下是LICES.A
用记事本打开
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