Picks up random element from a specified sequence and returns it. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:IEnumerable

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Description

Picks up random element from a specified sequence and returns it.

Demo Code


using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;// w w w.  j  a  v a  2s. c  o m

public class Main{
        /// <summary>
    ///   <para>Picks up random element from a specified sequence and returns it.</para>
    /// </summary>
    /// <typeparam name="T">Type of elements in a sequence.</typeparam>
    /// <param name="self">Source sequence of elements.</param>
    /// <returns>Random member of <paramref name="self"/> sequence.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="self"/> is a <c>null</c> reference. If <paramref name="self"/> contains no elements, returns <c>null</c>.</exception>
    public static T Random<T>(this IEnumerable<T> self)
    {
      Assertion.NotNull(self);

      var max = self.Count();
      return (T) (max > 0 ? self.ElementAt(new Random().Next(max)) : (object) null);
    }
}

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