// construct request body data
private static byte[] ConstructRequestBodyData(FormData formData)
{
if (formData == null || !formData.IsValid())
{
return(new byte[0]);
}
using (var smRequestBodyData = new System.IO.MemoryStream())
{
var bHasItemAdded = false;
const string strNewLine = "\r\n";
const string strBoundarySeparator = "--";
foreach (var formDataItem in formData.GetAll())
{
if (bHasItemAdded)
{
smRequestBodyData.Write(Encoding.GetBytes(strNewLine), 0, Encoding.GetByteCount(strNewLine));
}
var strKey = formDataItem.Key ?? string.Empty;
var value = formDataItem.Value.Key ?? string.Empty;
var strFileName = formDataItem.Value.Value ?? string.Empty;
// write key value pair
if (string.IsNullOrEmpty(strFileName))
{
var strFormDataItem = string.Format(
"{0}{1}{2}Content-Disposition: form-data; name=\"{3}\"{2}{2}{4}",
strBoundarySeparator,
StrBoundary,
strNewLine,
strKey,
value);
smRequestBodyData.Write(Encoding.GetBytes(strFormDataItem), 0, Encoding.GetByteCount(strFormDataItem));
}
// write file data
else
{
// write base64 or binary data
var fileByte = value as byte[];
var strHeader =
string.Format(
"{0}{1}{2}Content-Disposition: form-data; name=\"{3}\"; filename=\"{4}\"{2}Content-Type: {5}{2}{2}",
strBoundarySeparator,
StrBoundary,
strNewLine,
strKey,
strFileName,
fileByte == null ? "text/plain" : "application/octet-stream");
smRequestBodyData.Write(Encoding.GetBytes(strHeader), 0, Encoding.GetByteCount(strHeader));
smRequestBodyData.Write(fileByte ?? Encoding.GetBytes(value.ToString()), 0,
fileByte == null ? Encoding.GetByteCount(value.ToString()) : fileByte.Length);
}
bHasItemAdded = true;
}
if (bHasItemAdded)
{
var strFooter = strNewLine + strBoundarySeparator + StrBoundary + strBoundarySeparator + strNewLine;
smRequestBodyData.Write(Encoding.GetBytes(strFooter), 0, Encoding.GetByteCount(strFooter));
}
// dump stream into a byte[]
return(Comm.ReadStreamToBytes(smRequestBodyData));
}
}
// post multi-part form data
public static HttpWebResponse Post(string strUrl, Dictionary <string, string> dicHeader, FormData formData)
{
if (string.IsNullOrEmpty(strUrl))
{
throw new Exception("Url is invalid.");
}
var bodyData = ConstructRequestBodyData(formData);
var request = WebRequest.Create(strUrl) as HttpWebRequest;
request.Method = "POST";
request.ContentType = "multipart/form-data; boundary=" + StrBoundary;
request.ContentLength = bodyData.Length;
if (dicHeader != null)
{
foreach (var head in dicHeader)
{
request.Headers[head.Key] = head.Value;
}
}
using (var requestStream = request.GetRequestStream())
{
requestStream.Write(bodyData, 0, bodyData.Length);
}
return(request.GetResponse() as HttpWebResponse);
}