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37 lines
1.2 KiB
37 lines
1.2 KiB
using System;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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namespace Kehyeedra3
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{
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public static class Extensions
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{
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private static DateTime YeedraTime = new DateTime(2020, 2, 2, 0, 0, 0, DateTimeKind.Utc);
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public static ulong ToYeedraStamp(this DateTime time)
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=> (ulong)(time.Subtract(YeedraTime)).TotalSeconds;
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public static DateTime FromYeedraStamp(this ulong time)
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=> YeedraTime.AddSeconds(Convert.ToDouble(time));
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//https://stackoverflow.com/a/1262619
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public static void Shuffle<T>(this IList<T> list)
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{
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using (RNGCryptoServiceProvider provider = new RNGCryptoServiceProvider())
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{
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int n = list.Count;
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while (n > 1)
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{
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byte[] box = new byte[1];
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do provider.GetBytes(box);
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while (!(box[0] < n * (byte.MaxValue / n)));
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int k = (box[0] % n);
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n--;
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T value = list[k];
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list[k] = list[n];
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list[n] = value;
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}
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}
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}
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}
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} |