Searches IEnumerable for the max or default element. - CSharp System.Collections.Generic

CSharp examples for System.Collections.Generic:IEnumerable

  1. HOME
  2. CSharp
  3. System.Collections.Generic
  4. IEnumerable

Description

Searches IEnumerable for the max or default element.

Demo Code


using System.Linq;
using System.Collections.Generic;
using System;//  w ww.  j  a  v  a 2 s. com

public class Main{
        /// <summary>
        ///     Searches for the max or default element.
        /// </summary>
        /// <typeparam name="T">
        ///     The type.
        /// </typeparam>
        /// <typeparam name="TR">
        ///     The comparing type.
        /// </typeparam>
        /// <param name="container">
        ///     The container.
        /// </param>
        /// <param name="valuingFoo">
        ///     The comparing function.
        /// </param>
        /// <returns></returns>
        public static T MaxOrDefault<T, TR>(this IEnumerable<T> container, Func<T, TR> valuingFoo)
            where TR : IComparable
        {
            var enumerator = container.GetEnumerator();
            if (!enumerator.MoveNext())
            {
                return default(T);
            }

            var maxElem = enumerator.Current;
            var maxVal = valuingFoo(maxElem);

            while (enumerator.MoveNext())
            {
                var currVal = valuingFoo(enumerator.Current);

                if (currVal.CompareTo(maxVal) > 0)
                {
                    maxVal = currVal;
                    maxElem = enumerator.Current;
                }
            }

            return maxElem;
        }
}

Related Tutorials