C#调用HTTP POST请求上传图片

        public static string UploadImage(string uploadUrl, string imgPath, string fileparameter = "file")
        {
            HttpWebRequest request = WebRequest.Create(uploadUrl) as HttpWebRequest;
            request.AllowAutoRedirect = true;
            request.Method = "POST";

            string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
            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 = imgPath.LastIndexOf("/");
            string fileName = imgPath.Substring(pos + 1);

            //请求头部信息
            StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"" + fileparameter + "\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

            FileStream fs = new FileStream(imgPath, 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();

            HttpWebResponse response = request.GetResponse() as HttpWebResponse;
            Stream instream = response.GetResponseStream();
            StreamReader sr = new StreamReader(instream, Encoding.UTF8);
            return sr.ReadToEnd();
        }

调用

 UploadImage("http://127.0.0.1/upload", "D:/test.jpg", "upload");