private class TestCaseType
        {
            public TestCaseDelegate proc;  //测试程序
            public string desc;            //测试程序的标题（摘要说明）
        }

        private delegate void TestCaseDelegate();

private static IEnumerable<TestCaseType> GetTestCases(this  Assembly[] assembly)
{
    。。。。
}

        private static void StressTest(this  Assembly[] assembly, int 次数)
        {
            var tps = GetTestCases(assembly);
            if (tps.Count() == 0)
            {
                System.Console.WriteLine("******** 没有测试用例 ********");
                return;
            }

            var map = tps.AsParallel().SelectMany(tp => Clone(tp, 次数)).Select(tp => Test(tp));
            var reduce = from t in map
                         group t by t.proc into g
                         orderby g.Average(p => p.mi) descending
                         select new { proc = g.Key, desc = g.First().desc, mi = (long)g.Average(p => p.mi) };
            int testCnd = 0;
            reduce.ForEach(r => { System.Console.WriteLine("{0} 平均{1}毫秒\t{2}", ++testCnd, r.mi, r.desc.Description); });
        }

        //将测试用例重复多次
        private static IEnumerable<TestCaseType> Clone(TestCaseType t, int 倍数)
        {
            var c = new List<TestCaseType>();
            for (var i = 0; i < 倍数; i++)
                c.Add(new TestCaseType { desc = t.desc, proc = t.proc });
            return c;
        }

        //单独执行一个测试用例并记录耗时。如果可能，Test应该在一个Master机辅助下分布到不同的Worker机上执行。
        private static TestCaseTestType Test(TestCaseType p)
        {
            var wt = new Stopwatch();
            wt.Start();
            p.proc();
            wt.Stop();
            return new TestCaseTestType { proc = p.proc, desc = p.desc, mi = wt.ElapsedMilliseconds };
        }

        static public void ForEach<T>(this IEnumerable<T> array, Action<T> proc)
        {
            foreach (T obj in array)
                proc(obj);
        }