根据另一个百分比模拟一个计算的百分比

Question

我试图做一个模拟器基于百分比，并由一个整体改变...什么是最好的方式来做到这一点？

我们想模拟，例如，一个秋千。 20％来计算某些事情是由于整个击球手和投手的结果，并确定他是否击球。所以，如果他打的球，为他做了一个本垒打，一个犯规球，命中...等

感谢

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); 
}