merge branch master into media-attachments

1 files changed, 31 insertions, 0 deletions

diff --git a/MediaBrowser.Common/Extensions/ShuffleExtensions.cs b/MediaBrowser.Common/Extensions/ShuffleExtensions.cs
new file mode 100644
index 000000000..5889d09c4
--- /dev/null
+++ b/MediaBrowser.Common/Extensions/ShuffleExtensions.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Common.Extensions
+{
+    /// <summary>
+    /// Provides <c>Shuffle</c> extensions methods for <see cref="IList{T}" />.
+    /// </summary>
+    public static class ShuffleExtensions
+    {
+        private static readonly Random _rng = new Random();
+
+        /// <summary>
+        /// Shuffles the items in a list.
+        /// </summary>
+        /// <param name="list">The list that should get shuffled.</param>
+        /// <typeparam name="T">The type.</typeparam>
+        public static void Shuffle<T>(this IList<T> list)
+        {
+            int n = list.Count;
+            while (n > 1)
+            {
+                n--;
+                int k = _rng.Next(n + 1);
+                T value = list[k];
+                list[k] = list[n];
+                list[n] = value;
+            }
+        }
+    }
+}