[C#]记录程序耗时的方法

            System.Diagnostics.Stopwatch stopwatch = new System.Diagnostics.Stopwatch();
            stopwatch.Start();
            byte[] a = System.IO.File.ReadAllBytes("x:\\新建文本文档.txt");
            textBox2.AppendText("\r\n载入文件 总长{1} 耗时{0}秒  ".FormatWith(stopwatch.Elapsed.TotalSeconds, a.Length));
            stopwatch.Reset(); stopwatch.Start();
            byte[] b = LC.Fun.Hash.AES_Encrypt(a, "#JBP@Bb$DJGJ#1A!2");
            textBox2.AppendText("\r\n加密完成 总长{1} 耗时{0}秒".FormatWith(stopwatch.Elapsed.TotalSeconds, b.Length));
            stopwatch.Reset(); stopwatch.Start();
            byte[] c = LC.Fun.Hash.AES_Decrypt(b, "#JBP@Bb$DJGJ#1A!2");
            textBox2.AppendText("\r\n解密完成 总长{1} 耗时{0}秒".FormatWith(stopwatch.Elapsed.TotalSeconds, c.Length));
            stopwatch.Stop();