C# 简单POST请求 同时防止中文乱码的出现

public static string HttpPost(string url,string postDataStr)
{
            string strReturn;
            //在转换字节时指定编码格式
            byte[] byteData = Encoding.UTF8.GetBytes(postDataStr);  

            //配置Http协议头
            HttpWebRequest resquest= (HttpWebRequest)WebRequest.Create(url);
            resquest.Method = "POST";
            resquest.ContentType = "application/x-www-form-urlencoded";
            resquest.ContentLength = byteData.Length;

            //发送数据
            using (Stream resquestStream = resquest.GetRequestStream())
            {
                resquestStream.Write(byteData, 0, byteData.Length);
            }

            //接受并解析信息
            using (WebResponse response = resquest.GetResponse())
            {
                //解决乱码：utf-8 + streamreader.readToEnd
                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8"));
                strReturn = reader.ReadToEnd();
                reader.Close();
                reader.Dispose();
            }

            return strReturn;
}