POST 方式上传图片

Post 方式 模仿 form表单 上传 图片 设置enctype = multipart/form-data

<form  enctype="multipart/form-data"></form>

自定义 MultipartFormData 类  （4.5以上版本好像有这个类  类名称叫啥忘记了）

/// <summary>    /// multipart/form-data 数据类型    /// </summary>    public class MultipartFormData    {        public static string ContentType = "multipart/form-data; boundary=A300x";        PRivate string headerStream = "--A300x\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";        private string footerString = "--A300x--\r\n";        private string compart = "\r\n";        private string headerString = "--A300x\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n";        private List<byte> lists = new List<byte>();        private byte[] footerBytes;        private byte[] comparts;        public MultipartFormData()        {            footerBytes = Encoding.UTF8.GetBytes(footerString);            comparts = Encoding.UTF8.GetBytes(compart);                   }        public byte[] Buffer        {            get            {                return lists.ToArray();            }        }        private bool IsEnd = false;        /// <summary>        ///        /// </summary>        public void End()        {            if (!IsEnd)            {                IsEnd = true;                //lists.AddRange(footerBytes.ToList());                   this.AddRanges(footerBytes);            }                 }        public void AddRanges(byte[] array) {            foreach (byte b in array)                lists.Add(b);        }        /// <summary>        /// 向序列化到多部/窗体数据 MIME 类型的 对象集合添加 HTTP 内容        /// </summary>        /// <param name="content">要添加到集合中的 HTTP 内容</param>        /// <param name="name">要添加的 HTTP 内容的名称</param>        public void Add(string content, string name)        {            byte[] headerBytes = Encoding.UTF8.GetBytes(String.Format(headerString, name));            this.AddRanges(headerBytes);            byte[] buffer = Encoding.UTF8.GetBytes(content);            this.AddRanges(buffer);            this.AddRanges(comparts);        }        /// <summary>        /// 向序列化到多部/窗体数据 MIME 类型的 对象集合添加 HTTP 内容        /// </summary>        /// <param name="content">要添加到集合中的 HTTP 内容</param>        /// <param name="name">要添加的 HTTP 内容的名称</param>        /// <param name="fileName">要添加到集合中的 HTTP 内容的文件名</param>        public void Add(Stream content, string name, string fileName)        {            byte[] headerBytes = Encoding.UTF8.GetBytes(String.Format(headerStream, name, fileName));            this.AddRanges(headerBytes);            byte[] buffer = new byte[content.Length];            content.Read(buffer, 0, buffer.Length);            content.Seek(0, SeekOrigin.Begin);            this.AddRanges(buffer);            this.AddRanges(comparts);        }        /// <summary>        /// 向序列化到多部/窗体数据 MIME 类型的 对象集合添加 HTTP 内容        /// </summary>        /// <param name="content">要添加到集合中的 HTTP 内容</param>        /// <param name="name">要添加的 HTTP 内容的名称</param>        /// <param name="fileName">要添加到集合中的 HTTP 内容的文件名</param>        public void Add(byte[] content, string name, string fileName)        {            byte[] headerBytes = Encoding.UTF8.GetBytes(String.Format(headerStream, name, fileName));            this.AddRanges(headerBytes);            this.AddRanges(content);            this.AddRanges(comparts);        }    }

上传图片代码

        /// <summary>        /// form-data 数据类型传递数据        /// </summary>        private MultipartFormData multiparFormData = new MultipartFormData();        /// <summary>        /// 键值对应        /// </summary>        /// <param name="key"></param>        /// <param name="value"></param>        public void AddFormData(string key, string value)        {            this.multiparFormData.Add(value, key);        }/// <summary>        /// 传递一个 strem 类型        /// </summary>        /// <param name="key"></param>        /// <param name="value"></param>        /// <param name="fileName"></param>        public void AddFormData(string key, Stream value, string fileName)        {            this.multiparFormData.Add(value, key, fileName);        }        /// <summary>        /// 传递一个 byte[] 类型        /// </summary>        /// <param name="key"></param>        /// <param name="value"></param>        /// <param name="fileName"></param>        public void AddFormData(string key, byte[] value, string fileName)        {            this.multiparFormData.Add(value, key, fileName);        }        private static CookieContainer m_Cookie = new CookieContainer();/// <summary>        /// POST form-data 方式请求消息        /// </summary>        /// <param name="url"></param>        /// <param name="isHttps"></param>        /// <returns></returns>        public string PostFromData(string url, bool isHttps) {            try            {                multiparFormData.End();                HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);                request.Method = "POST";                request.ContentType = MultipartFormData.ContentType;                request.CookieContainer = m_Cookie;//设置上一个访问页面的cookie 保持session                request.ContentLength = multiparFormData.Buffer.Length;                Stream stream = request.GetRequestStream();                stream.Write(multiparFormData.Buffer, 0, multiparFormData.Buffer.Length);                stream.Close();                WebResponse response = request.GetResponse();                Stream streamResponse = response.GetResponseStream();                StreamReader sr = new StreamReader(streamResponse);                return sr.ReadToEnd();            }            catch (Exception ex) {                Log.WriteLog("POST form-data 方式请求消息:" + ex.Message);                return "error";            }        }