private HtmlFormInfo GetHtmlFormInfo(string htmlContent)
{
HtmlDocument document = new HtmlDocument();
document.LoadHtml(htmlContent);
HtmlNode formNode = document.DocumentNode.SelectSingleNode("//form");
var method = formNode.GetAttributeValue("method", string.Empty);
var action = formNode.GetAttributeValue("action", string.Empty);
var htmlFormInfo = new HtmlFormInfo(method, action);
HtmlNodeCollection inputNodes = formNode.SelectNodes("//input");
foreach (var inputNode in inputNodes)
{
var name = inputNode.GetAttributeValue("name", string.Empty);
var value = inputNode.GetAttributeValue("value", string.Empty);
if (!string.IsNullOrEmpty(name))
htmlFormInfo.Parameters.Add(name, value);
}
return htmlFormInfo;
}
private WebRequest CreateWebRequestFromFormInfo(HtmlFormInfo formInfo)
{
string data = string.Join("&", formInfo.Parameters.Select(parameter => string.Format("{0}={1}", parameter.Key, parameter.Value))); //replace <value>
byte[] dataStream = Encoding.UTF8.GetBytes(data);
var webRequest = (HttpWebRequest)WebRequest.Create(formInfo.Action);
webRequest.Method = formInfo.Method;
webRequest.AllowAutoRedirect = false;
webRequest.ContentType = "text/html; charset=utf-8";
webRequest.ContentLength = dataStream.Length;
using (var requestStream = webRequest.GetRequestStream())
{
requestStream.Write(dataStream, 0, dataStream.Length);
}
return webRequest;
}