Coding Smarter Tips 2

static void Tips2()

{

    //**String轉成不同編碼的Byte Array

    string s = "丁丁是個人才";

    byte[] buffBIG5 =

        System.Text.Encoding.GetEncoding("big5").GetBytes(s);

    byte[] buffUTF8 =

        System.Text.Encoding.UTF8.GetBytes(s);

    //**Byte Array轉成十六進位數字字串

    //別再自己跑迴圈了，用這個

    string t = BitConverter.ToString(buffBIG5);

    Console.WriteLine(t);

    //**由目錄名稱跟檔案名組出完整路徑

    //你還在為了目錄名稱後方要不要加\而煩惱嗎?

    //快閃開! 讓專業的來

    Console.WriteLine(Path.Combine("C:\\TEMP", "F1.TXT"));

    Console.WriteLine(Path.Combine(@"C:\TEMP\", "F2.htm"));

    //**從路徑中擷取出目錄名、檔案名、副檔名

    //要IndexOf一下嗎? 不用!!

    string f = @"C:\TEMP\F3.pdf";

    Console.WriteLine(Path.GetDirectoryName(f));

    Console.WriteLine(Path.GetFileName(f));

    Console.WriteLine(Path.GetExtension(f));

    //**取得暫存路徑、使用者根目錄(User Home)

    //要設法讀取DOS環境參數嗎? 參數名稱到底是哪一個?

    Console.WriteLine(Path.GetTempPath());

    Console.WriteLine(Environment.SpecialFolder.MyDocuments);

    //**取一個不會重覆的暫存檔名

    //時分秒加亂數好像還是有可能打架，怎辦?

    for (int i = 1; i < 10; i++)

        Console.WriteLine(Path.GetTempFileName());

    //**把字串寫到檔案裡

    //應該用StreamWriter，沒錯吧? 其實可以更省!

    System.IO.File.WriteAllText(@"A:\Temp.txt", t);

    //**計時

    //我之前都這麼寫

    DateTime st = DateTime.Now;

    System.Threading.Thread.Sleep(1024);

    TimeSpan ts = DateTime.Now - st;

    Console.WriteLine(ts.TotalMilliseconds + "ms");

    //更簡潔更精確的計時器

    System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();

    sw.Start();

    System.Threading.Thread.Sleep(1024);

    sw.Stop();

    Console.WriteLine(sw.ElapsedMilliseconds + "ms");

    Console.WriteLine(sw.ElapsedTicks + "ticks");  

}