C#基礎異步回調類

using System;
using System.IO;

public class AsyncHronousIO
...{
    FileStream myFileStream;
    int lngNumber;static bool IsEnd;
    static void Main()
    ...{
        AsyncHronousIO myAsyncHronousIO = new AsyncHronousIO();
        myAsyncHronousIO.longProcessWrite();
    }
    public void longProcessWrite()
    ...{
        File.Delete("TT.txt");
        Console.Write("輸入數據大小!");
        //為什麼數字大了文件就顯示0字節,裡邊沒有內容?
        lngNumber = int.Parse(Console.ReadLine());
        byte[] b = new byte[lngNumber];
        for (int i = 0; i < lngNumber; i++)b[i]=(byte)i;
        Console.WriteLine("寫入大量數據!");
        //聲明異步回調類，其實就是啟動了一個新的線程，在線程結束時調用WriteEnd
        AsyncCallback myAsyncCallback = new AsyncCal lback(WriteEnd);
        //創建文件流
        myFileStream = new FileStream(@"TT.txt", FileMode.Create);
        Console.WriteLine("大量數據寫入! TT.txt");
        myFileStream.BeginWrite(b, 0, b.Length, myAsyncCallback, null);
        do Console.Write(".");//當數字較大此處才能在在IsEnd == true執行輸出多個“.”
        while (AsyncHronousIO.IsEnd == false);
        myFileStream.Flush();
    }
    public void WriteEnd(IAsyncResult asyncResult)
    ...{
        AsyncHronousIO.IsEnd = true;
        Console.WriteLine("寫入完畢! TT.txt");
    }
}