Get Random from IEnumerable - CSharp System.Collections

CSharp examples for System.Collections:IEnumerable

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Description

Get Random from IEnumerable

Demo Code

/* ************************************************************
 *
 *    @author Couchbase <info@couchbase.com>
 *    @copyright 2014 Couchbase, Inc.//from ww  w.  j  av a2  s  . com
 *
 *    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 T GetRandom<T>(this IEnumerable<T> list)
        {
            T item;
            var enumerable = list as IList<T> ?? list.ToList();
            var length = enumerable.Count();
            if (length > 0)
            {
                var index = Random.Next(length);
                item = enumerable[index];
            }
            else
            {
                item = default(T);
            }
            return item;
        }
        public static T GetRandom<T>(this List<T> list)
        {
            T item;
            var length = list.Count;
            if (length > 0)
            {
                var index = Random.Next(length);
                item = list[index];
            }
            else
            {
                item = default(T);
            }
            return item;
        }
}

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