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

CSharp examples for System.Collections.Generic:IEnumerable

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Description

Searches IEnumerable for the min or default element.

Demo Code


using System.Linq;
using System.Collections.Generic;
using System;/* w ww  . java 2s.c o  m*/

public class Main{
        /// <summary>
        ///     Searches for the min 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 MinOrDefault<T, TR>(this IEnumerable<T> container, Func<T, TR> valuingFoo)
            where TR : IComparable
        {
            var enumerator = container.GetEnumerator();
            if (!enumerator.MoveNext())
            {
                return default(T);
            }

            var minElem = enumerator.Current;
            var minVal = valuingFoo(minElem);

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

                if (currVal.CompareTo(minVal) < 0)
                {
                    minVal = currVal;
                    minElem = enumerator.Current;
                }
            }

            return minElem;
        }
}

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