public static void Read()
        {
            StreamReader sr = new StreamReader("D:\\test.txt", Encoding.GetEncoding("utf-8"));
            String line;
            while ((line = sr.ReadLine()) != null)
            {
                Console.WriteLine(line.ToString());
            }
            Console.ReadKey();
        }

        
 
public static void Read1()
        {
            try
            {
                byte[] byData = new byte[100];
                char[] charData = new char[1000];

                FileStream file = new FileStream("D:\\test.txt", FileMode.Open);
                file.Seek(0, SeekOrigin.Begin);
                file.Read(byData, 
 
0, 100); //byData傳進來的位元組陣列,用以接受FileStream物件中的資料,第2個引數是位元組陣列中開始寫入資料的位置,它通常是0,表示從陣列的開端檔案中向陣列寫資料,最後一個引數規定從檔案讀多少字元.
                Decoder d = Encoding.UTF8.GetDecoder();
                d.GetChars(byData, 0, byData.Length, charData, 0);
                Console.WriteLine(charData);
                Console.ReadKey();
                file.Close();
            }
            
 
catch (IOException e)
            {
                Console.WriteLine(e.ToString());
                Console.ReadKey();
            }
        }