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private static double _Run(string description, Action<int, int> action, int a, int b)
{
if (action == null) throw new ArgumentNullException("action");

// 启动计时器
var stopwatch = Stopwatch.StartNew();

// 运行要测量的代码
action(a, b);

// 终止计时
stopwatch.Stop();

// 输出结果
Console.WriteLine("{0}: {1}", description, stopwatch.Elapsed.TotalMilliseconds.ToString(CultureInfo.InvariantCulture));

// 返回执行时间
return stopwatch.Elapsed.TotalMilliseconds;
}