Extension.cs

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

namespace DarkestDungeonRandomizer;

static class Extension
{
    public static int? TryParseInt(this string value)
    {
        if (int.TryParse(value, out int result))
        {
            return result;
        }
        return null;
    }

    public static TValue GetValueOrSetDefault<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, TValue @default)
    {
        if (dict.ContainsKey(key))
        {
            return dict[key];
        }
        else
        {
            dict[key] = @default;
            return @default;
        }
    }

    public static T[] Shuffle<T>(this IEnumerable<T> original, Random random)
    {
        T[] newData = original.ToArray();
        int n = newData.Length;
        while (n > 1)
        {
            n--;
            int k = random.Next(n + 1);
            T value = newData[k];
            newData[k] = newData[n];
            newData[n] = value;
        }
        return newData;
    }
}