WebClient 實現多檔案/文本同時上傳

標籤：

public class CreateBytes    {        Encoding encoding = Encoding.UTF8;        /**/        /// <summary>        /// 拼接所有的位元組為一個數組        /// </summary>        /// <param name="byteArrays">數組</param>        /// <returns></returns>        /// <remarks>加上結束邊界</remarks>        public byte[] JoinBytes(ArrayList byteArrays)        {            int length = 0;            int readLength = 0;            // 加上結束邊界            string endBoundary = Boundary + "--\r\n"; //結束邊界            byte[] endBoundaryBytes = encoding.GetBytes(endBoundary);            byteArrays.Add(endBoundaryBytes);            foreach (byte[] b in byteArrays)            {                length += b.Length;            }            byte[] bytes = new byte[length];            // 遍曆複製            //            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>        /// 擷取普通表單區域位元組        /// </summary>        /// <param name="fieldName">表單名</param>        /// <param name="fieldValue">表單值</param>        /// <returns></returns>        /// <remarks>        /// -----------------------------7d52ee27210a3c\r\nContent-Disposition: form-data; name=\"表單名\"\r\n\r\n表單值\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>        /// 擷取檔案上傳表單區域位元組        /// </summary>        /// <param name="fieldName">表單名</param>        /// <param name="filename">檔案名稱</param>        /// <param name="contentType">檔案類型</param>        /// <param name="contentLength">檔案長度</param>        /// <param name="stream">檔案流</param>        /// <returns>位元組</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";            // 頭資料            string data = String.Format(textTemplate, fieldName, filename, contentType);            byte[] bytes = encoding.GetBytes(data);            // 尾資料            byte[] endBytes = encoding.GetBytes(end);            // 合成後的數組            byte[] fieldData = new byte[bytes.Length + fileBytes.Length + endBytes.Length];            bytes.CopyTo(fieldData, 0); // 頭資料            fileBytes.CopyTo(fieldData, bytes.Length); // 檔案的位元據            endBytes.CopyTo(fieldData, bytes.Length + fileBytes.Length); // \r\n            return fieldData;        }        #region 屬性        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    }

調用方式如下:

CreateBytes cb = new CreateBytes();            // 所有表單資料            ArrayList bytesArray = new ArrayList();            // 普通表單            bytesArray.Add(cb.CreateFieldData("jsonDataStr", ""));            // 讀檔案流            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));            // 檔案表單            bytesArray.Add(cb.CreateFieldData("file1", "wolfy.JPG", ContentType, fileBytes));            bytesArray.Add(cb.CreateFieldData("file2", "wolfy1.JPG", ContentType, fileBytes));            // 合成所有表單並產生位元組            byte[] bytes = cb.JoinBytes(bytesArray);            // 返回的內容            byte[] responseBytes;            bool uploaded = cb.UploadData("http://localhost:8700/api/System/ImgUpload", bytes, out responseBytes);

 

WebClient 實現多檔案/文本同時上傳