System.IO.StreamReader.Read C# (CSharp) Метод

        public override int Read()
        {
            if (_stream == null)
            {
                throw new ObjectDisposedException(null, SR.ObjectDisposed_ReaderClosed);
            }

            CheckAsyncTaskInProgress();

            if (_charPos == _charLen)
            {
                if (ReadBuffer() == 0)
                {
                    return -1;
                }
            }
            int result = _charBuffer[_charPos];
            _charPos++;
            return result;
        }

        /// <summary>
        /// post方法传递json数据
        /// </summary>
        /// <param name="urlStr">目标url</param>
        /// <param name="urlStrFunc">对应方法</param>
        /// <param name="urlStrPara">json参数</param>
        /// <returns></returns>
        public static string Post_RSA_Json(string urlStr, string urlStrFunc, string urlStrPara)
        {
            Encoding encode = Encoding.UTF8;
            byte[] arrB = encode.GetBytes(urlStrPara);
            HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(urlStr + urlStrFunc);
            myReq.Method = "POST";
            myReq.ContentType = "application/x-www-form-urlencoded";
            myReq.ContentLength = arrB.Length;
            Stream outStream = myReq.GetRequestStream();
            outStream.Write(arrB, 0, arrB.Length);
            outStream.Close();
            //接收HTTP做出的响应
            WebResponse myResp = myReq.GetResponse();

            Stream ReceiveStream = myResp.GetResponseStream();
            StreamReader readStream = new StreamReader(ReceiveStream, encode);
            Char[] read = new Char[256];
            int count = readStream.Read(read, 0, 256);
            string str = null;
            while (count > 0)
            {
                str += new String(read, 0, count);
                count = readStream.Read(read, 0, 256);
            }
            readStream.Close();
            myResp.Close();
            return str;
        }