Question

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Closed 12 years ago.

我有一只剪切功能,即作为更大的 al子的一部分,但设计这一功能时却犹豫不决。正在根据同样的论点,计算不同结果,以适合多个方面。我看不到问题在什么地方发挥作用。任何开明的建议都会受到欢迎。

private readonly Dictionary<int,decimal>_cache = new Dictionary<int, decimal>(); // lookup cache
    private void CalculateFitness(TimeTable timeTable)
    {                      
        const int points = 1;            

        var exams = timeTable.Exams.ToList();
        var combinations = exams.Select(x => exams.Where(y => exams.IndexOf(y) > exams.IndexOf(x))
                                                          .Select(z => new List<Exam> { x, z }))
                                                          .SelectMany(x => x);


        var clash = combinations.Where(touple => touple[0].Period.Id == touple[1].Period.Id && touple[0].Date == touple[1].Date && touple[0].Students.Intersect(touple[1].Students).Any());
        var clCount = clash.Sum(touple => touple[0].Students.Intersect(touple[1].Students).Count());            



        var score = clCount == 0 ? timeTable.Exams.Count : timeTable.Exams.Count - clCount;


        if (_cache.ContainsKey(score))
        {
            timeTable.Fitness = _cache[score];
        }
        else
        {
            timeTable.Fitness = Math.Abs(decimal.Divide(score, (timeTable.Exams.Count * points))); // Calculate Fitness 
            _cache.Add(score, timeTable.Fitness);
        }
    }

Answer 1

It is returning different results on multiple runs for the same arguments

这意味着你的职能不是免费的,你正在改变或利用全球国家。实现和取消这些职能,应始终保持预期价值。

Answer 2

这一职能似乎依靠同样的动态数据。方法机构将帮助很多人。

你们认为,不可能有相同论点的不同结果? C#毕竟不是实用语言。

Answer 3

这个问题的另一个传统是:

foreach (var foo in myFooList)
{
    DoSomethingAsync(() => { SomeFunctionToExecute(foo); }
}

(进入经修改的关闭)

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