HttpWebRequest post上傳文件

  public static string HttpUploadFile(string url, string path){// 設置參數 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;CookieContainer cookieContainer = new CookieContainer();request.CookieContainer = cookieContainer;request.AllowAutoRedirect = true;request.Method = "POST";string boundary = DateTime.Now.Ticks.ToString("X"); // 隨機分隔線 request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");int pos = path.LastIndexOf("\\");string fileName = path.Substring(pos + 1);//請求頭部信息  StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"file\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);byte[] bArr = new byte[fs.Length];fs.Read(bArr, 0, bArr.Length);fs.Close();Stream postStream = request.GetRequestStream();postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);postStream.Write(bArr, 0, bArr.Length);postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);postStream.Close();//發送請求并獲取相應回應數據 HttpWebResponse response = request.GetResponse() as HttpWebResponse;//直到request.GetResponse()程序才開始向目標網頁發送Post請求 Stream instream = response.GetResponseStream();StreamReader sr = new StreamReader(instream, Encoding.UTF8);//返回結果網頁（html）代碼 string content = sr.ReadToEnd();return content;}

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