代碼驗證C#執行”檔案開啟關閉操作“耗時

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2017-04-19

部門經理習慣用C#做資料清洗，遇到個需要驗證的問題，在一個萬次左右迴圈內對檔案執行開啟關閉操作，比在迴圈前開啟檔案、迴圈後關閉檔案耗時多多少。

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.IO;using System.Diagnostics;using System.Threading;namespace ConsoleApplication1{    public class Program    {        static void Main(string[] args)        {            int index = 0;            long i = 0;            var stopWatch = new Stopwatch();            //StreamWriter f = new StreamWriter(@"D:\sum.txt", false);            for (i = 0; i < 100000; i++)            {                stopWatch.Start();                if (i == 10000)                {                    stopWatch.Stop();                    Console.WriteLine("Program run" + stopWatch.ElapsedMilliseconds + "ms.");                    Thread.Sleep(10000);                }                i += 1;                Console.WriteLine(i);                 StreamWriter f = new StreamWriter(@"D:\sum.txt", false);                index += 1;                f.Write(index);                f.Close();            }            //f.Close();            Console.ReadKey();        }    }}

 

代碼驗證C#執行”檔案開啟關閉操作“耗時