public class CreateBytes    {        Encoding encoding = Encoding.UTF8;        /**/        /// <summary>        /// 拼接所有的二进制数组为一个数组        /// </summary>        /// <param name="byteArrays">数组</param>        /// <returns></returns>        /// <remarks>加上结束边界</remarks>        public byte[] JoinBytes(ArrayList byteArrays)        {            int length = 0;            int readLength = 0;            // 加上结束边界            string endBoundary = Boundary + "--\r\n"; //结束边界            byte[] endBoundaryBytes = encoding.GetBytes(endBoundary);            byteArrays.Add(endBoundaryBytes);            foreach (byte[] b in byteArrays)            {                length += b.Length;            }            byte[] bytes = new byte[length];            // 遍历复制            //            foreach (byte[] b in byteArrays)            {                b.CopyTo(bytes, readLength);                readLength += b.Length;            }            return bytes;        }        public bool UploadData(string uploadUrl, byte[] bytes, out byte[] responseBytes)        {            WebClient webClient = new WebClient();            webClient.Headers.Add("Content-Type", ContentType);            try            {                responseBytes = webClient.UploadData(uploadUrl, bytes);                return true;            }            catch (WebException ex)            {                Stream resp = ex.Response.GetResponseStream();                responseBytes = new byte[ex.Response.ContentLength];                resp.Read(responseBytes, 0, responseBytes.Length);            }            return false;        }        /**/        /// <summary>        /// 获取普通表单区域二进制数组        /// </summary>        /// <param name="fieldName">表单名</param>        /// <param name="fieldValue">表单值</param>        /// <returns></returns>        /// <remarks>        /// -----------------------------7d52ee27210a3c\r\nContent-Disposition: form-data; name=\"表单名\"\r\n\r\n表单值\r\n        /// </remarks>        public byte[] CreateFieldData(string fieldName, string fieldValue)        {            string textTemplate = Boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}\r\n";            string text = String.Format(textTemplate, fieldName, fieldValue);            byte[] bytes = encoding.GetBytes(text);            return bytes;        }        /**/        /// <summary>        /// 获取文件上传表单区域二进制数组        /// </summary>        /// <param name="fieldName">表单名</param>        /// <param name="filename">文件名</param>        /// <param name="contentType">文件类型</param>        /// <param name="contentLength">文件长度</param>        /// <param name="stream">文件流</param>        /// <returns>二进制数组</returns>        public byte[] CreateFieldData(string fieldName, string filename, string contentType, byte[] fileBytes)        {            string end = "\r\n";            string textTemplate = Boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";            // 头数据            string data =http://www.mamicode.com/ String.Format(textTemplate, fieldName, filename, contentType);            byte[] bytes = encoding.GetBytes(data);            // 尾数据            byte[] endBytes = encoding.GetBytes(end);            // 合成后的数组            byte[] fieldData = http://www.mamicode.com/new byte[bytes.Length + fileBytes.Length + endBytes.Length];            bytes.CopyTo(fieldData, 0); // 头数据            fileBytes.CopyTo(fieldData, bytes.Length); // 文件的二进制数据            endBytes.CopyTo(fieldData, bytes.Length + fileBytes.Length); // \r\n            return fieldData;        }        #region 属性        public string Boundary        {            get            {                string[] bArray, ctArray;                string contentType = ContentType;                ctArray = contentType.Split(‘;‘);                if (ctArray[0].Trim().ToLower() == "multipart/form-data")                {                    bArray = ctArray[1].Split(‘=‘);                    return "--" + bArray[1];                }                return null;            }        }        public string ContentType        {            get            {                if (HttpContext.Current == null)                {                    return "multipart/form-data; boundary=---------------------------7d5b915500cee";                }                return HttpContext.Current.Request.ContentType;            }        }        #endregion    }

CreateBytes cb = new CreateBytes();            // 所有表单数据            ArrayList bytesArray = new ArrayList();            // 普通表单            bytesArray.Add(cb.CreateFieldData("jsonDataStr", ""));            // 读文件流            FileStream fs = new FileStream("wolfy.JPG", FileMode.Open,                FileAccess.Read, FileShare.Read);            string ContentType = "application/octet-stream";            byte[] fileBytes = new byte[fs.Length];            fs.Read(fileBytes, 0, Convert.ToInt32(fs.Length));            // 文件表单            bytesArray.Add(cb.CreateFieldData("file1", "wolfy.JPG", ContentType, fileBytes));            bytesArray.Add(cb.CreateFieldData("file2", "wolfy1.JPG", ContentType, fileBytes));            // 合成所有表单并生成二进制数组            byte[] bytes = cb.JoinBytes(bytesArray);            // 返回的内容            byte[] responseBytes;            bool uploaded = cb.UploadData("http://localhost:8700/api/System/ImgUpload", bytes, out responseBytes);