關(guān)鍵代碼：

        /// <summary>        /// 獲取文件大小—字節(jié)        /// </summary>        /// <param name="filePath">文件路徑</param>        /// <returns>文件大小</returns>        public static long GetSize(string filePath)        {            long _size = 0;            try            {                if (File.Exists(filePath))                {                    FileStream _stream = new FileStream(filePath, FileMode.Open);                    _size = _stream.Length;                    _stream.Close();                    _stream.Dispose();                }            }            catch (Exception ex)            {                _size = 0;                Debug.WriteLine(string.Format("獲取文件大小異常，原因：{0}", ex.Message));            }            return _size;        }        /// <summary>        /// 獲取文件大小—kb        /// </summary>        /// <param name="filePath">文件路徑</param>        /// <returns>文件大小_kb</returns>        public static double GetKBSize(string filePath)        {            double _kb = 0;            long _size = GetSize(filePath);            if (_size != 0)            {                _kb = _size / 1024d;            }            return _kb;        }        /// <summary>        /// 獲取文件大小—mb        /// </summary>        /// <param name="filePath">文件路徑</param>        /// <returns>文件大小_mb</returns>        public static double GetMBSize(string filePath)        {            double _mb = 0;            long _size = GetSize(filePath);            if (_size != 0)            {                _mb = _size / 1048576d;//1024*1024==1048576;            }            return _mb;        }代碼比較簡單，那么我們來測試一下，有一個一兆多日志文件，來讀取下，如圖：

測試代碼：

                string _path = @"C:/CodePlex/CSharpUtilHelp/UtilHelp/LogUtilHelpV2Test/bin/Release/Log/20140731.log";                Console.WriteLine("File Size:" + FileToolV2.GetSize(_path));                Console.WriteLine("File Size_kb:" + FileToolV2.GetKBSize(_path) + " kb");                Console.WriteLine("File Size_mb:" + FileToolV2.GetMBSize(_path) + " mb");

測試效果：

希望有所幫助！