/// <summary>
/// 效率測試
/// </summary>
/// <param name="testCount">第幾次測試</param>
private static void timeTest(int testCount)
{
    const int listCount = 10000000;         // 陣列長度
    Random random = new Random();           // 資料隨機構建值

    // 陣列構建 
    List<int> listData = new List<int>();
    
 
for (int i = 0; i < listCount; i++)
    {
        listData.Add(random.Next(10000));
    }

    // LINQ 測試
    Stopwatch linq_Stopwatch = new Stopwatch();
    linq_Stopwatch.Start();
    var linqList = from num in listData
                    where num > 100
                    select num;
    var linqCount = linqList.Count();   
    linq_Stopwatch.Stop();

    
 
// 普通方式 測試
    Stopwatch before_Stopwatch = new Stopwatch();
    before_Stopwatch.Start();
    List<int> beforeList = new List<int>(listCount);
    for (int i = 0; i < listData.Count(); i++)
    {
        if (listData[i] > 100)
            beforeList.Add(listData[i]);
    }
    var beforeCount = beforeList.Count;
    before_Stopwatch.Stop();

    
 
// 列印結果
    Console.WriteLine(String.Format("第{0}次測試,測試：{5}條資料。\n\r \t LINQ用時：{1}毫秒,篩選了{2}條資料。\n\r\t 普通用時：{3}毫秒,篩選了{4}條資料。\r\n",
        testCount, linq_Stopwatch.ElapsedMilliseconds, linqCount, before_Stopwatch.ElapsedMilliseconds, beforeCount, listCount));
}