关于C# 转BASE64 在UTF-8编码 POST提交给JAVA 接口的时候提示stream.length异常的问题

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目前我的C/S程序要提交给java做的一个接口数据，json字符串，然后通过BASE64加密通过http Post提交，提交的提示stream.length引发了system.notsuporttedexception类型的异常
代码如下：



string url = "http://xxxxxxx/websms/thirdMsg.do?method=execute";

HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url);

webrequest.Method = "post";

webrequest.ContentType = "application/json";

string coderstr = "\"code\":\"test\"";

string passwordstr = "\"password\":\"111111\"";

string content = "\"content\":\"测试！\"";

string mobile = "\"mobile\";[\"" + dt.Rows[0]["Mobile"].ToString() + "\"]";

string commType = "\"commType\":\"1\"";

string replyFlag = "\"replyFlag\":\"0\"";

string replyTime = "\"replyTime\":\"" + Tools.GetDate().ToString("yyyyMMddHHmmss") + "\"";

                                    string notEncrypting = "\"notEncrypting\"\"0\"";



string paramStr = "{" + coderstr + "," + passwordstr + "," + content + "," + mobile + "," + commType + "," + replyFlag + "," + replyTime + "," + notEncrypting + "}";

byte[] b = System.Text.Encoding.Default.GetBytes(paramStr);

string aa = Convert.ToBase64String(b);

byte[] ss = Encoding.UTF8.GetBytes(aa);

webrequest.ContentLength = ss.Length;

Stream stream;

stream = webrequest.GetRequestStream();

stream.p(ss, 0, ss.Length);

stream.Close();