Upload images in POST mode and images in post Mode

Upload images in POST mode and images in post Mode

Set enctype = multipart/form-data

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

 

Custom MultipartFormData class (for Versions later than 4.5, it seems that this class name is missing)

/// <Summary> /// multipart/form-data Type // </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 "; private string footerString = "-- A300x -- \ r \ n"; private string compart = "\ r \ n "; Private string headerString = "-- A300x \ r \ nContent-Disposition: form-data; name = \" {0} \ "\ 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> /// add HTTP content to the object set serialized to multiple/form data MIME types /// </summary> /< param name =" content "> HTTP content to be added to the set </param> // <param name =" name "> name of the HTTP content to be added </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> /// add HTTP content to the object set serialized to multiple/form data MIME types /// </summary> /< param name =" content "> HTTP content to be added to the collection </param> /// <param name =" name "> name of the HTTP content to be added </param> /// <param name = "fileName"> File name of the HTTP content to be added to the set </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> /// add HTTP content to the object set serialized to multiple/form data MIME types /// </summary> /< param name =" content "> HTTP content to be added to the collection </param> /// <param name =" name "> name of the HTTP content to be added </param> /// <param name = "fileName"> File name of the HTTP content to be added to the collection </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 );}}

Upload Image Code

/// <Summary> // form-data type transfer data // </summary> private MultipartFormData multiparFormData = new MultipartFormData (); /// <summary> /// corresponding to the key value /// </summary> /// <param name = "key"> </param> /// <param name = "value"> </param> public void AddFormData (string key, string value) {this. multiparFormData. add (value, key );} /// <summary> /// pass a strem type /// </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> /// pass a byte [] type // </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 Request Message // </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; // set the cookie of the previous access page to keep the 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 Request message:" + ex. message); return "error ";}}