Случайный взвешенный выбор

Как насчет чего-то более rand общего, которое можно использовать prng для любого типа данных?

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;

public static class IEnumerableExtensions {
    
    public static T RandomElementByWeight(this IEnumerable sequence, Func weightSelector) {
        float totalWeight = sequence.Sum(weightSelector);
        // The weight we are after...
        float itemWeightIndex =  (float)new Random().NextDouble() * totalWeight;
        float currentWeightIndex = 0;

        foreach(var item in from weightedItem in sequence select new { Value = weightedItem, Weight = weightSelector(weightedItem) }) {
            currentWeightIndex += item.Weight;
            
            // If we've hit or passed the weight we are after for this item then it's the one we want....
            if(currentWeightIndex >= itemWeightIndex)
                return item.Value;
            
        }
        
        return default(T);
        
    }
    
}

Просто algorithms позвоните

    Dictionary foo = new Dictionary();
    foo.Add("Item 25% 1", 0.5f);
    foo.Add("Item 25% 2", 0.5f);
    foo.Add("Item 50%", 1f);
    
    for(int i = 0; i < 10; i++)
        Console.WriteLine(this, "Item Chosen {0}", foo.RandomElementByWeight(e => e.Value));