C# Post提交数据

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/// <summary> /// Post提交数据 /// </summary> /// <param name="postUrl">URL</param> /// <param name="paramData">参数</param> /// <returns></returns> private string PostWebRequest(string postUrl, string paramData) {     string ret = string.Empty;     try     {         if (!postUrl.StartsWith("http://"))             return "";           byte[] byteArray = Encoding.Default.GetBytes(paramData); //转化         HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));         webReq.Method = "POST";         webReq.ContentType = "application/x-www-form-urlencoded";           webReq.ContentLength = byteArray.Length;         Stream newStream = webReq.GetRequestStream();         newStream.Write(byteArray, 0, byteArray.Length);//写入参数         newStream.Close();         HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();         StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);         ret = sr.ReadToEnd();         sr.Close();         response.Close();         newStream.Close();     }     catch (Exception ex)     {        return ex.Message;     }     return ret; }