public void GetInt_DontHaveProbability()
    {
        try
        {
            _weightedRandom.GetInt();

            Assert.Fail();
        }
        catch (ArgumentException)
        {
        }
        catch (Exception)
        {
            Assert.Fail();
        }
    }
    void DoShow(Dictionary <int, int> probabilities)
    {
        WeightedRandom        weightedRandom = new WeightedRandom(probabilities);
        Dictionary <int, int> numberTime     = probabilities.ToDictionary(p => p.Key, p => 0); // 第二个 Lambda 以 KeyValuePair 为参数,但直接返回 0

        for (int i = 0; i < _loopTime; i++)
        {
            numberTime[weightedRandom.GetInt()]++;
        }

        StringBuilder sb = new StringBuilder("获取" + _loopTime + "次随机数\n");

        foreach (KeyValuePair <int, int> item in numberTime)
        {
            sb.Append(item.Key + ":" + item.Value + "次:" + item.Value / (float)_loopTime * 100 + "%\n");
        }

        _resultText.text = sb.ToString();
    }