Hi Joe,

I noticed some strange behavior when requesting filter streams. Streams with a larger number of filter values (>20) result in an ArgumentException in TwitterExecute.GetBasicStreamRequest on line 655 due to duplicate requestparameters that can not be converted to a dictionary.

This description applies to WinRt and the ffbabcf9f7d3 commit.
I do a stream request like this:

                        stream = (from strm in twitterCtx.Streaming
                                  where strm.Type == StreamingType.Filter &&
                                      strm.Track == filter
                                  select strm)
                        .StreamingCallback(strm =>
                        {
                            // stream callback handling
                        })
                        .SingleOrDefault();

When stepping through the code I found that the request will always have it's requestparameters duplicated. This is the call sequence resulting in the duplication:

TwitterExecute.GetBasicStreamRequest
extracts a dictionary of postdata from request and calls OAuthAuthorizer.PostRequest with the request and postdata

OAuthAuthorizer.PostRequest
calls OAuthTwitter.GetOAuthQueryStringForPost

OAuthTwitter.GetOAuthQueryStringForPost
adds a dictionary of postdata to the request as requestparameters resulting in duplicate requestparameters

With longer filter values TwitterExecute.GetBasicStreamRequest is called a second time resulting in the mentioned exception.

regards,

Roland Smeenk