public static FileDate FindLastCacheFile(string cacheDir, string cacheFileNamePrefix, string dateFromToRegexPattern, string dateParsePattern, string separator)
{
var dateDictionary = new SortedDictionary <DateTime, FileDate>();
string regexp = string.Format("{0}{1}{2}", cacheFileNamePrefix, separator, dateFromToRegexPattern);
Regex reg = new Regex(regexp);
string directorySearchPattern = string.Format("{0}*", cacheFileNamePrefix);
IEnumerable <string> filePaths = Directory.EnumerateFiles(cacheDir, directorySearchPattern);
foreach (var filePath in filePaths)
{
var fileName = Path.GetFileName(filePath);
var match = reg.Match(fileName);
if (match.Success)
{
var from = match.Groups[1].Value;
var to = match.Groups[2].Value;
var dateFrom = DateTime.ParseExact(from, dateParsePattern, CultureInfo.InvariantCulture);
var dateTo = DateTime.ParseExact(to, dateParsePattern, CultureInfo.InvariantCulture);
var fileDate = new FileDate
{
From = dateFrom,
To = dateTo,
FilePath = filePath
};
dateDictionary.Add(dateTo, fileDate);
}
}
if (dateDictionary.Count() > 0)
{
// the first element is the newest date
return(dateDictionary.Last().Value);
}
// return a default file date
return(default(FileDate));
}
public abstract Task <List <T> > GetCombinedUpdatedAndExistingAsync(IMyConfiguration configuration, TextWriter writer, FileDate lastCacheFileInfo, DateTime from, DateTime to);