根據另一個百分比模擬一個計算的百分比

Question

我試圖做一個模擬器基於百分比，並由一個整體改變...什麼是最好的方式來做到這一點？

我們想模擬，例如，一個鞦韆。 20％來計算某些事情是由於整個擊球手和投手的結果，並確定他是否擊球。所以，如果他打的球，爲他做了一個本壘打，一個犯規球，命中...等

感謝

Answer 1

private static Random rand = new Random(); 

public static T ChooseRandomOutcome<T>(Dictionary<T,int> relativeWeights) 
{ 
    Random rand = new Random(); 

    var total = relativeWeights.Values.Sum(); 
    var randomValue = rand.Next(total); 
    var runningSum = 0; 
    foreach (var pair in relativeWeights) 
    { 
     if (randomValue < pair.Value) 
     { 
      return pair.Key; 
     } 
     runningSum += pair.Value; 
    } 
    throw new Exception("This should never happen.");  
} 

用法：

public Enum PitchOutcome 
{ 
    Ball, 
    Strike, 
    Hit 
} 

public Enum HitOutcome 
{ 
    PopFly, 
    HomeRun, 
    Single, 
} 

var weights = new Dictionary<PitchOutcome, int>(); 
weights.Add(PitchOutcome.Ball, 40); 
weights.Add(PitchOutcome.Strike, 30); 
weights.Add(PitchOutcome.Hit, 30); 
PitchOutcome randomOutcome = ChooseRandomOutcome(weights); 
// it should be a Hit 30% of the time. 

if (randomOutcome == PitchOutcome.Hit) 
{ 

    var hitWeights = new Dictionary<HitOutcome, int>(); 
    hitWeights.Add(HitOutcome.PopFly, 50); 
    hitWeights.Add(HitOutcome.HomeRun, 5); 
    hitWeights.Add(HitOutcome.Single, 45); 
    HitOutcome hitResult = ChooseRandomOutcome(hitWeights); 
}