private static StudentGradeContainer GetMatchingStudentGradeContainer(StudentGradeContainer needle, IEnumerable <StudentGradeContainer> haystack)
{
StudentGradeContainer primaryChoice = null;
StudentGradeContainer secondaryChoice = null;
foreach (var item in haystack)
{
if (item.StudentGrade.StudentSection == needle.StudentGrade.StudentSection)
{
primaryChoice = item;
}
else if (secondaryChoice == null &&
item.StudentGrade.StudentSection.CourseTitle == needle.StudentGrade.StudentSection.CourseTitle)
{
secondaryChoice = item;
}
}
return(primaryChoice ?? secondaryChoice);
}
private static void CalculateMetricComponentTrend(StudentGradeContainer studentGradeContainer, StudentCourseGradingPeriodCalculation previousGradingPeriodData)
{
if (previousGradingPeriodData == null)
{
return;
}
var StudentSection = studentGradeContainer.StudentGrade.StudentSection;
if (StudentSection == null)
{
return;
}
var matchedPreviousGrade = GetMatchingStudentGradeContainer(studentGradeContainer, previousGradingPeriodData.StudentGrades);
if (matchedPreviousGrade == null)
{
return;
}
var currentRank = studentGradeContainer.StudentGrade.GradeRank;
var previousRank = matchedPreviousGrade.StudentGrade.GradeRank;
if (currentRank == previousRank)
{
studentGradeContainer.Trend = 0;
}
else if (currentRank > previousRank)
{
// the trend on the metric component for this metric is calculated as the opposite of the trend
// for the metric calculation, but both end up as the same result:
// TrendInterpretation is -1, which means that a TrendDirection of -1 means 'doing better'.
studentGradeContainer.Trend = -1;
}
else
{
studentGradeContainer.Trend = 1;
}
}
