讀寫檔案在實際運用中比較多的，自己總結記下了，方便複用，給大家參考下

第一種方式：

   /// <summary>
        /// 寫檔案
        /// </summary>
        /// <param name="path">儲存路徑</param>
        /// <param name="message">內容</param>
        /// <param name="append">是否追加還是覆蓋</param>
        public static void WriterFile(string path,string message,bool append) {
            using (StreamWriter swtrain = new StreamWriter(path, append, Encoding.UTF8))
            {            
                    swtrain.WriteLine(message);            
            }
        }
       /// <summary>
     /// 讀取檔案
     /// </summary>
     /// <param name="path"></param>
        public static void ReadFile(string path) {
            using (StreamReader sr = new StreamReader(path, Encoding.UTF8))
            {
                string line;
                while ((line = sr.ReadLine()) != null)//讀取每一行資料
                {
                    Console.WriteLine(line.ToString());
                }
            }           
        }    
 

第二種方式：

        /// <summary>
        /// 寫入檔案
        /// </summary>
        /// <param name="path">路徑</param>
        /// <param name="message">資訊</param>
        public static void stream2File(string path,string  message)
        {
            byte [] buffer=Encoding.UTF8.GetBytes(message);
            bytetTostream(buffer);
             FileStream fs = new FileStream(path, FileMode.Create);
            BinaryWriter writer = new BinaryWriter(fs);
            writer.Write(buffer);
            writer.Close();
            fs.Close();
        }
        /// <summary>
        /// 讀取檔案
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        public static void file2Stream(string path)
        {
            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            byte[] buffer=stream2byte(fs);
            Stream stream = new MemoryStream(buffer);
            stream.Seek(0, SeekOrigin.Begin);
            StreamReader sr = new StreamReader(stream);
            string line;
            while ((line = sr.ReadLine()) != null)//讀取每一行資料
            {
                Console.WriteLine(line.ToString());
            }
        }
        /// <summary>
        /// stream 轉為byte[]
        /// </summary>
        /// <param name="stream"></param>
        /// <returns></returns>
        public static byte[] stream2byte(Stream stream)
        {
            byte[] buffer = new byte[stream.Length];
            stream.Read(buffer, 0, buffer.Length);
            return buffer;
        }
        /// <summary>
        /// byte[] 轉stream
        /// </summary>
        /// <param name="buffer"></param>
        /// <returns></returns>
        public static Stream bytetTostream(byte[] buffer)
        {
            Stream stream = new MemoryStream(buffer);
            stream.Seek(0, SeekOrigin.Begin);
            //設定stream的position為流的開始
            return stream;
        }

 

一看就知道第一種方式比較好，程式碼量少，簡潔。寫第二種作為參考，它們都是繼承stream,