public HashSet <string> Resolve(string code)
{
code = code.ToUpper();
var set = _cache.GetValue(code);
if (set == null)
{
var slist = ParamData.FindSimilarStation(code);
if (slist == null)
{
set = new HashSet <string>()
{
code
}
}
;
else
{
set = slist.Select(s => s.Code).MapToHashSet();
}
foreach (var s in set)
{
_cache.AddOrUpdate(s, set);
}
}
return(set);
}
