private PlaceCollection GetPlaceCollection(T each)
{
PlaceCollection places = null;
if (string.IsNullOrEmpty(PlaceNamespace))
{
places = each.Places;
}
else
{
places = each.Places.NS(PlaceNamespace);
}
return(places);
}
/// <summary>
/// 進行排名。
/// </summary>
/// <param name="scoreParser">要被排名的成績計算邏輯。</param>
/// <param name="option">排名選項，接序 or 不接序排名。</param>
/// <param name="placeNamespace">存放排名結果的 Namespace。</param>
public void Rank(IScoreParser <T> scoreParser, PlaceOptions option)
{
//取得有成績的學生。
List <ScoredStudent> students = GetScoredStudents(scoreParser);
//排序名次。
students.Sort(delegate(ScoredStudent x, ScoredStudent y)
{
decimal X = x.Score;
decimal Y = y.Score;
//反過來排，由大到小。
return(Y.CompareTo(X));
});
//決定排序。
IPlaceAlgorithm algorithm = null;
if (option == PlaceOptions.Sequence)
{
algorithm = new Sequence();
}
else
{
algorithm = new Unsequence();
}
int radix = students.Count;
string scorename = scoreParser.Name;
foreach (ScoredStudent each in students)
{
int level = algorithm.NextLevel(each.Score);
T student = _students[each.Id];
PlaceCollection places = GetPlaceCollection(student);
if (places.Contains(scorename))
{
places[scorename] = new Place(level, each.Score, radix);
}
else
{
places.Add(scorename, new Place(level, each.Score, radix));
}
}
}
public RatingScope <T> GetTopPercentage(string ratingName, int top)
{
RatingScope <T> result = new RatingScope <T>(Name);
RatingScope <T> radixStuds = new RatingScope <T>(Name);
decimal filterPercentage = top;
//把有那項排名的學生獨立出來。
foreach (T each in _students.Values)
{
PlaceCollection places = GetPlaceCollection(each);
if (places.Contains(ratingName))
{
radixStuds.Add(each);
}
}
//計算要取的 Percentage。
decimal extractPlace = Math.Ceiling((filterPercentage / 100m) * radixStuds.Count);
foreach (T each in radixStuds)
{
PlaceCollection places = GetPlaceCollection(each);
if (places[ratingName].Level <= extractPlace)
{
result.Add(each);
}
}
//之前的取百分比名次做法。
//foreach (RatingStudent each in students)
//{
// if (each.Places.Contains(ratingName))
// {
// Place p = each.Places[ratingName];
// decimal percentage = (100m * ((decimal)p.Level / (decimal)p.Radix));
// if (percentage <= 0) percentage = 1;
// if (percentage <= filterPercentage)
// {
// result.Add(each);
// }
// }
//}
return(result);
}
/// <summary>
/// 取得前 n 名次的學生。
/// </summary>
/// <param name="ratingName">排名的名稱，例如：國文。(與IScoreParser 實作之實體 Name 屬性值相同)</param>
/// <param name="top">要取得名次。</param>
/// <param name="placeNamespace">名次存放的 Namespace。</param>
public RatingScope <T> GetTopPlaces(string ratingName, int top)
{
RatingScope <T> result = new RatingScope <T>(Name);
foreach (T each in _students.Values)
{
PlaceCollection places = GetPlaceCollection(each);
if (places.Contains(ratingName))
{
if (places[ratingName].Level <= top)
{
result.Add(each);
}
}
}
return(result);
}
