42 lines
1.2 KiB
C#
42 lines
1.2 KiB
C#
using System;
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using System.Collections.Generic;
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namespace MediaBrowser.Common.Extensions
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{
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/// <summary>
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/// Provides <c>Shuffle</c> extensions methods for <see cref="IList{T}" />.
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/// </summary>
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public static class ShuffleExtensions
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{
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private static readonly Random _rng = new Random();
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/// <summary>
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/// Shuffles the items in a list.
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/// </summary>
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/// <param name="list">The list that should get shuffled.</param>
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/// <typeparam name="T">The type.</typeparam>
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public static void Shuffle<T>(this IList<T> list)
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{
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list.Shuffle(_rng);
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}
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/// <summary>
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/// Shuffles the items in a list.
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/// </summary>
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/// <param name="list">The list that should get shuffled.</param>
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/// <param name="rng">The random number generator to use.</param>
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/// <typeparam name="T">The type.</typeparam>
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public static void Shuffle<T>(this IList<T> list, Random rng)
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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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int k = rng.Next(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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