使用ArrayList更高效

C#没有像VB中那样可以定义动态数组,但有更加强大的ArrayList(),下面例子获取一组数据中的最大值,并且用ArrayList获取他们的在数列中的序号。

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace debug
{
    class Program
    {
        static int getMax(int[] numGroup, out ArrayList indices)
        {
            int maxValue;
            indices = new ArrayList();
            maxValue = numGroup[0];
            int count=0;
            foreach (int num in numGroup)
            {
            if (num>maxValue)
            {
            maxValue = num;
            }
            }
            foreach (int num in numGroup)
            {
                if (num == maxValue)
                {
                    indices.Add(count);
                }
                count++;
            }
            return maxValue;
        }
       
        static void Main(string[] args)
        {
            int[] myNumbers;
            myNumbers = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 3, 4, 5, 6, 8, 0, 8, 9, 5, 3, 9 };
            ArrayList indices;
            indices = new ArrayList();
            Console.WriteLine("The maximum value is {0}", getMax(myNumbers, out indices));
            Console.Write("Their indices are");
            foreach (object obj in indices)
            {
                Console.Write(" {0} ",obj);
            }
            Console.ReadKey();
        }
    }
}

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