using System;

​

string[,] data = new string[,] {

    {"one", "filter1", "1"},

    {"two", "filter2", "1"},

    {"three", "filter2", "1"},

    {"four", "filter3", "2"},

    {"five", "filter3", "1"}

};

​

for (int i=1; i<= 100; i++) Console.Write(select(data, "*")[0] + " ");

​

string[] select(string[,] selections, string filter) {

    int count = selections.GetLength(0);

    var rand = new Random();

    string selectedItem = "";

    string selectedFilter = "*";

    int weight = 0;

    int total = 0;

    for (int i=0; i < count; i++) {

        string currentFilter = selections[i, 1];

        if ((filter != "*") & (currentFilter != filter)) continue;

        weight = Int32.Parse(selections[i, 2]);

        total += weight;

        int roll = rand.Next(1, total + 1);

        Console.WriteLine($"{weight}/{total} : {roll}");

​

        if (roll<= weight) {

            selectedItem = selections[i, 0];

            selectedFilter = selections[i, 1];

        }

    }

    return new string[] {selectedItem, selectedFilter};

};