文件和二进制流的相互转换

/// <summary>
        /// 把文件转化为二进制流
        /// </summary>
        /// <param name="Path">文件路径</param>
        /// <returns></returns>
        public static byte[] ConvertToBinary(string Path)
        {
            FileStream stream = new FileInfo(Path).OpenRead();
            byte[] buffer = new byte[stream.Length];
            stream.Read(buffer, 0, Convert.ToInt32(stream.Length));
            return buffer;
        }
        #endregion




byte[] file = Convert.FromBase64String(datass);
            //保存文件
            string FilePath = "D:\\杭州集广OA\\文件交换\\XHQJYJ\\传阅板\\Test.docx";
            FileStream fstream = File.Create(FilePath, file.Length);//创建文件流
            try
            {
                fstream.Write(file, 0, file.Length);//把二进制流数据写入文件
                fstream.Close();
            }