/// <summary>
/// Reads the data for this import from the file specified.
/// </summary>
/// <param name="filename">The file to read from.</param>
/// <param name="errorMessage">The error message if unsuccessful.</param>
/// <returns>True if read successfully, false otherwise.</returns>
public override bool ReadFromFile(string filename, out string errorMessage)
{
_pollsProvider = new PollsProvider();
errorMessage = string.Empty;
// Try to deserialize the file into the constituency results.
List <OpinionPoll> opinionPolls = new List <OpinionPoll>();
try
{
using (StreamReader sr = new StreamReader(filename, Encoding.Default))
{
CsvReader csv = new CsvReader(sr, CultureInfo.CurrentCulture);
bool foundStartDataTag = false;
while (csv.Read())
{
// Get the first field.
string pollingCompany = csv.GetField <string>(0);
// Ignore empty entries.
if (string.IsNullOrWhiteSpace(pollingCompany))
{
continue;
}
// If haven't found the header line see if this is it
if (!foundStartDataTag)
{
if (pollingCompany.Contains(DataStartTag))
{
foundStartDataTag = true;
}
continue;
}
// If here on a line with data try to convert it into a record.
OpinionPoll poll = GetOpinionPollFromRecord(csv, pollingCompany);
if (poll != null)
{
opinionPolls.Add(poll);
}
}
}
}
catch (Exception e)
{
errorMessage = e.ToString();
return(false);
}
if (opinionPolls.Any())
{
_pollsProvider = new PollsProvider(opinionPolls);
}
return(true);
}
/// <summary>
/// Loads the polls from a file.
/// </summary>
/// <param name="resultsDir">The full path of the the results files.</param>
/// <param name="fileName">The full path of the notes notes file, or null if the default is to be read.</param>
public PollingFileParser(string resultsDir, string fileName = null)
{
_pollsProvider = new PollsProvider();
Parse(resultsDir, fileName);
}
