/// <summary>
/// <c>GetAnswers</c> overlays any answer collections passed into it, into a single XML answer collection.
/// It has two primary uses: it can be used to combine multiple answer collections into a single
/// answer collection; and/or it can be used to "resolve" or standardize an answer collection
/// submitted from a browser interview (which may be specially encoded) into standard XML answers.
/// </summary>
/// <param name="answers">A sequence of answer collections. Each member of this sequence
/// must be either an (encoded) interview answer collection or a regular XML answer collection.
/// Each member will be successively overlaid (overlapped) on top of the prior members to
/// form one consolidated answer collection.</param>
/// <param name="logRef">A string to display in logs related to this request.</param>
/// <returns></returns>
public string GetAnswers(IEnumerable<TextReader> answers, string logRef)
{
string logStr = logRef == null ? string.Empty : logRef;
if (answers == null)
throw new ArgumentNullException("answers", string.Format(@"WebService.Services.GetAnswers: the ""answers"" parameter passed in was null, logRef: {0}", logStr));
BinaryObject combinedAnswers;
using (Proxy client = new Proxy(_endPointName))
{
var answerObjects = (from answer in answers select Util.GetBinaryObjectFromTextReader(answer)).ToArray();
combinedAnswers = client.GetAnswers(answerObjects);
SafeCloseClient(client, logRef);
}
return Util.ExtractString(combinedAnswers);
}