private string GetFeature(int wordId, params int[] fields)
{
string[] allFeatures = GetAllFeaturesArray(wordId);
if (allFeatures is null)
{
return(null);
}
StringBuilder sb = new StringBuilder();
if (fields.Length == 0)
{ // All features
foreach (string feature in allFeatures)
{
sb.Append(CSVUtil.QuoteEscape(feature)).Append(",");
}
}
else if (fields.Length == 1)
{ // One feature doesn't need to escape value
sb.Append(allFeatures[fields[0]]).Append(",");
}
else
{
foreach (int field in fields)
{
sb.Append(CSVUtil.QuoteEscape(allFeatures[field])).Append(",");
}
}
return(sb.Remove(sb.Length - 1, 1).ToString());
}