C# Unity 随机概率刷权重 可更改 0-100 任意调整

class WeightedRandomBag<T>
{

    private struct Entry
    {
        public double accumulatedWeight;
        public T item;
    }

    private List<Entry> entries = new List<Entry>();
    private double accumulatedWeight;
    private System.Random rand = new System.Random();

    public void AddEntry(T item, double weight)
    {
        accumulatedWeight += weight;
        entries.Add(new Entry { item = item, accumulatedWeight = accumulatedWeight });
    }

    public T GetRandom()
    {
        double r = rand.NextDouble() * accumulatedWeight;

        foreach (Entry entry in entries)
        {
            if (entry.accumulatedWeight >= r)
            {
                return entry.item;
            }
        }
        return default(T); //should only happen when there are no entries
    }
}

使用

  WeightedRandomBag<int> itemDrops = new WeightedRandomBag<int>();

            // Setup - a real game would read this information from a configuration file or database
            itemDrops.AddEntry(0, 0);
            itemDrops.AddEntry(1, 20.0);
            itemDrops.AddEntry(2, 45.0);
            itemDrops.AddEntry(3, 0);
            itemDrops.AddEntry(4, 10.0);

            // drawing random entries from it
            for (int i = 0; i < 2000; i++)
            {
                // System.out.println(itemDrops.getRandom());
                Debug.LogError("... " + itemDrops.GetRandom());
            }