Shuffle a List - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:List

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Description

Shuffle a List

Demo Code

/* ************************************************************
 *
 *    @author Couchbase <info@couchbase.com>
 *    @copyright 2014 Couchbase, Inc./*  ww w .  j a  va  2 s.  c  o m*/
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 *
 * ************************************************************/
using System.Linq;
using System.Collections.Generic;
using System;

public class Main{
        public static List<T> Shuffle<T>(this List<T> list)
        {
            var length = list.Count;
            while (length > 1)
            {
                length--;
                var index = Random.Next(length + 1);
                var item = list[index];
                list[index] = list[length];
                list[length] = item;
            }
            return list;
        }
        public static void Shuffle(this Array array)
        {
            var length = array.Length;
            while (length > 1)
            {
                length--;
                var index = Random.Next(length + 1);
                var item = array.GetValue(index);
                array.SetValue(array.GetValue(length), index);
                array.SetValue(item, length);
            }
        }
}

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