using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Windows.Forms;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            var arr = new[]
                      {
                          new {Val1="1",Val2="B"},
                          new {Val1="5",Val2="B"},
                          new {Val1="3",Val2="B"},
                          new {Val1="2",Val2="B"},
                          new {Val1="4",Val2="B"}
                      };
            var max = arr.Max(t => t.Val1, t => t);
            Debug.WriteLine(max.Val1 + " " + max.Val2);
        }

    }
    public static class こんなMAX欲しかった
    {
        public static TResult Max<TSource, TValue, TResult>(this IEnumerable<TSource> source, Func<TSource, TValue> selecter, Func<TSource, TResult> resultSelecter) where TValue : IComparable, IComparable<TValue>
        {
            TValue maxVal = default(TValue);
            TResult result = default(TResult);
            foreach (var item in source)
            {
                var val = selecter(item);
                if (val.CompareTo(maxVal) >= 0)
                {
                    maxVal = val;
                    result = resultSelecter(item);
                }
            }

            return result;
        }
    }
}