获取Streamreader的长度

我怎样才能得到a的长度StreamReader，据我所知，不会再向其中写入任何内容。 我想也许我可以将所有数据传递给MemoryStream，它有一个名为Length，但我陷入了如何将 byte[] 附加到 a 的问题上MemoryStream.

private void Cmd(string command, string parameter, object stream)
        {

            StreamWriter writer = (StreamWriter)stream;
            StreamWriter input;
            StreamReader output;

            Process process = new Process();

            try
            {
                process.StartInfo.UseShellExecute = false;
                process.StartInfo.CreateNoWindow = true;
                process.StartInfo.RedirectStandardOutput = true;
                process.StartInfo.RedirectStandardInput = true;
                process.StartInfo.FileName = "cmd";
                process.Start();

                input = process.StandardInput;
                output = process.StandardOutput;
                input.WriteLine(command + " " + parameter);
                input.WriteLine("exit");

                using (MemoryStream ms = new MemoryStream())
                {
                    int length = 1024;
                    char[] charbuffer = new char[length];
                    byte[] bytebuffer = new byte[length];

                    while (!output.EndOfStream)
                    {
                        output.Read(charbuffer, 0, charbuffer.Length);
                        for (int i = 0; i < length; i++)
                        {
                            bytebuffer[i] = Convert.ToByte(charbuffer[i]);
                        }
                        //append bytebuffer to memory stream here
                    }

                    long size = ms.Length;

                    writer.WriteLine(size);
                    writer.Flush(); //send size of the following message

                    //send message
                }

            }
            catch (Exception e)
            {
                InsertLog(2, "Could not run CMD command");
                writer.WriteLine("Not valid. Ex: " + e.Message);
            }
            writer.Flush();
        }

那么，如何动态地将 byte[] 附加到 MemoryStream 中？ 有比这更好的方法来获取长度output这样我就可以警告另一端将发送的消息的大小？

这对你有用吗？

        StreamReader sr = new StreamReader(FilePath);
        long x = sr.BaseStream.Length;