How to use POST base64 for Webservice

Question

I need POST one parameter, which is from base64 to webservice , but it does not work.

  string postData = "base64=hySGNg22yX0AIjNQvNJw0xHEbi32NH+iRVKDkbOmUiKpxW0/S6rUgfLmSa527Y8zZ3GmEzfXMB8ry8fH5GjGeJFGqFxDC4A2hLlvIFzyiDeUCqloGDAJoOLa8Jnif1C8nwRte0GNCRM5RXkshLKZP2itZclgDCYz6OgAF7oLNluoB44cZ3AgF1Q8hVgME8LeqgOqxsIzTt3Xn+96j7zp/wA="; byte[] dataArray = Encoding.Default.GetBytes(postData); HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ServerPage); request.Method = "POST"; request.ContentLength = dataArray.Length; request.ContentType = "application/x-www-form-urlencoded"; Stream dataStream = null; try { dataStream = request.GetRequestStream(); } catch (Exception) { } dataStream.Write(dataArray, 0, dataArray.Length); dataStream.Close(); iRVKDkbOmUiKpxW0 / S6rUgfLmSa527Y8zZ3GmEzfXMB8ry8fH5GjGeJFGqFxDC4A2hLlvIFzyiDeUCqloGDAJoOLa8Jnif1C8nwRte0GNCRM5RXkshLKZP2itZclgDCYz6OgAF7oLNluoB44cZ3AgF1Q8hVgME8LeqgOqxsIzTt3Xn + 96j7zp / wA =";  string postData = "base64=hySGNg22yX0AIjNQvNJw0xHEbi32NH+iRVKDkbOmUiKpxW0/S6rUgfLmSa527Y8zZ3GmEzfXMB8ry8fH5GjGeJFGqFxDC4A2hLlvIFzyiDeUCqloGDAJoOLa8Jnif1C8nwRte0GNCRM5RXkshLKZP2itZclgDCYz6OgAF7oLNluoB44cZ3AgF1Q8hVgME8LeqgOqxsIzTt3Xn+96j7zp/wA="; byte[] dataArray = Encoding.Default.GetBytes(postData); HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(ServerPage); request.Method = "POST"; request.ContentLength = dataArray.Length; request.ContentType = "application/x-www-form-urlencoded"; Stream dataStream = null; try { dataStream = request.GetRequestStream(); } catch (Exception) { } dataStream.Write(dataArray, 0, dataArray.Length); dataStream.Close(); 

but the parameter in requestHeader changes to:

base64=hySGNg22yX0AIjNQvNJw0xHEbi32NH%2BiRVKDkbOmUiKpxW0%2FS6rUgfLmSa527Y8zZ3GmEzfXMB8ry8fH5GjGeJFGqFxDC4A2hLlvIFzyiDeUCqloGDAJoOLa8Jnif1C8nwRte0GNCRM5RXkshLKZP2itZclgDCYz6OgAF7oLNluoB44cZ3AgF1Q8hVgME8LeqgOqxsIzTt3Xn%2B96j7zp%2FwA%3D

therefore WebService receives an invalid parameter:

 [WebMethod] public string GenerateOrder(string base64) { byte[] buffer = Convert.FromBase64String(base64); //Exception here } 

Answer 1

Use HttpUtility.UrlDecode(base64) before converting it from base64 .