ActionResult Invoke(ServiceAction action, IDictionary <string, string> arguments,
Encoding encoding, int retry, bool isFallback)
{
// Because we may do several fallbacks, we serialize to a memory stream and copy that
// to the network stream. That way we only have to serialize once (unless we have to
// try a different encoding scheme).
using (var stream = new MemoryStream()) {
try {
var headers = new WebHeaderCollection();
var settings = new XmlWriterSettings {
Encoding = encoding
};
using (var writer = XmlWriter.Create(stream, settings)) {
action.SerializeRequest(arguments, headers, writer);
}
using (var response = GetResponse(action, headers, retry, stream)) {
if (response.StatusCode == HttpStatusCode.OK)
{
return(action.DeserializeResponse(response));
}
else if (response.StatusCode == HttpStatusCode.InternalServerError)
{
if (isFallback)
{
action.DeserializeResponseFault(response);
}
return(null);
}
else if (response.StatusCode == HttpStatusCode.BadRequest)
{
return(null);
}
else
{
throw new UpnpException(string.Format(
"There was an unknown error while invoking the action: " +
"the service returned status code {0}.", response.StatusCode));
}
}
} catch (Exception e) {
throw new UpnpException("There was an unknown error while invoking the action.", e);
}
}
}