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    /// <summary>
    /// 文件通用類
    /// </summary>
    public class FileHelper
    {
         
        
         

        #region 文件相關操作方法

 
        /// <summary> 
        /// 檢測指定文件是否存在，如果存在則返回true。
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param>         
        public static bool IsExistFile(string filePath)
        {
            return File.Exists(filePath);
        }

        #region create


        /// <summary> 
        /// 創建一個文件
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        public static void CreateFile(string filePath)
        {
            try
            {
                //如果文件不存在則創建該文件 
                if (!IsExistFile(filePath))
                {
                    //創建一個FileInfo對象 
                    FileInfo file = new FileInfo(filePath);
                    //創建文件 
                    FileStream fs = file.Create();
                    //關閉文件流 
                    fs.Close();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary> 
        /// 創建一個文件,并將字節流寫入文件。 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        /// <param name="buffer">二進制流數據</param> 
        public static void CreateFile(string filePath, byte[] buffer)
        {
            try
            {
                //如果文件不存在則創建該文件 
                if (!IsExistFile(filePath))
                {
                    //創建一個FileInfo對象 
                    FileInfo file = new FileInfo(filePath);
                    //創建文件 
                    FileStream fs = file.Create();
                    //寫入二進制流 
                    fs.Write(buffer, 0, buffer.Length);
                    //關閉文件流 
                    fs.Close();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary> 
        /// 創建一個文件,并將字節流寫入文件。 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        /// <param name="stream">數據流</param> 
        public static bool CreateFile(string filePath, Stream stream)
        {

            bool result = false;
            try
            {
                using (var fs = System.IO.File.Open(filePath, FileMode.OpenOrCreate))
                {
                    int length = 4 * 1024;
                    var buf = new byte[length]; 
                    do{
                        length = stream.Read(buf, 0, length);
                        fs.Write(buf, 0, length);
                    } while (length != 0);

                    result = true;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }

            return result;
        }

        #endregion

        #region Get


        /// <summary> 
        /// 從文件的絕對路徑中獲取擴展名 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param>         
        public static string GetExtension(string filePath)
        {
            //獲取文件的名稱 
            FileInfo fi = new FileInfo(filePath);
            return fi.Extension;
        }

        /// <summary> 
        /// 從文件的絕對路徑中獲取文件名( 包含擴展名 ) 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param>         
        public static string GetFileName(string filePath)
        {
            //獲取文件的名稱 
            FileInfo fi = new FileInfo(filePath);
            return fi.Name;
        }
        /// <summary> 
        /// 獲取指定目錄中所有文件列表 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param>         
        public static string[] GetFileNames(string directoryPath)
        {
            //如果目錄不存在，則拋出異常 
            if (!IsExistDirectory(directoryPath))
            {
                throw new FileNotFoundException();
            }
            //獲取文件列表 
            return Directory.GetFiles(directoryPath);
        }

        /// <summary> 
        /// 獲取指定目錄及子目錄中所有文件列表 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param> 
        /// <param name="searchPattern">模式字符串，"*"代表0或N個字符，"?"代表1個字符。 
        /// 范例："Log*.xml"表示搜索所有以Log開頭的Xml文件。</param> 
        /// <param name="isSearchChild">是否搜索子目錄</param> 
        public static string[] GetFileNames(string directoryPath, string searchPattern, bool isSearchChild)
        {
            //如果目錄不存在，則拋出異常 
            if (!IsExistDirectory(directoryPath))
            {
                throw new FileNotFoundException();
            }
            try
            {
                if (isSearchChild)
                {
                    return Directory.GetFiles(directoryPath, searchPattern, SearchOption.AllDirectories);
                }
                else
                {
                    return Directory.GetFiles(directoryPath, searchPattern, SearchOption.TopDirectoryOnly);
                }
            }
            catch (IOException ex)
            {
                throw ex;
            }
        }


        /// <summary> 
        /// 從文件的絕對路徑中獲取文件名( 不包含擴展名 ) 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param>         
        public static string GetFileNameNoExtension(string filePath)
        {
            //獲取文件的名稱
            FileInfo fi = new FileInfo(filePath);
            return fi.Name.Split('.')[0];
        }

        /// <summary> 
        /// 獲取文本文件的行數 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param>         
        public static int GetLineCount(string filePath)
        {
            //將文本文件的各行讀到一個字符串數組中 
            string[] rows = File.ReadAllLines(filePath);
            //返回行數 
            return rows.Length;
        }

  
        /// <summary> 
        /// 獲取一個文件的長度,單位為Byte 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param>         
        public static int GetFileSize(string filePath)
        {
            //創建一個文件對象 
            FileInfo fi = new FileInfo(filePath);
            //獲取文件的大小 
            return (int)fi.Length;
        }

        /// <summary> 
        /// 將文件讀取到緩沖區中 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        public static byte[] GetFileToBytes(string filePath)
        {
            //獲取文件的大小  
            int fileSize = GetFileSize(filePath);
            //創建一個臨時緩沖區 
            byte[] buffer = new byte[fileSize];
            //創建一個文件流 
            FileInfo fi = new FileInfo(filePath);
            FileStream fs = fi.Open(FileMode.Open);
            try
            {
                //將文件流讀入緩沖區 
                fs.Read(buffer, 0, fileSize);
                return buffer;
            }
            catch (IOException ex)
            {
                throw ex;
            }
            finally
            {
                //關閉文件流 
                fs.Close();
            }
        }

        /// <summary> 
        /// 將文件讀取到字符串中 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        /// <param name="encoding">字符編碼</param> 
        public static string GetFileToString(string filePath, Encoding encoding)
        {
            //創建流讀取器 
            StreamReader reader = new StreamReader(filePath, encoding);
            try
            {
                //讀取流 
                return reader.ReadToEnd();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                //關閉流讀取器 
                reader.Close();
            }
        }


        #endregion



        #region Insert

        /// <summary> 
        /// 向文本文件中寫入內容 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        /// <param name="content">寫入的內容</param>         
        public static void WriteText(string filePath, string content)
        {
            //向文件寫入內容 
            File.WriteAllText(filePath, content);
        }
        /// <summary> 
        /// 向文本文件的尾部追加內容 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        /// <param name="content">寫入的內容</param> 
        public static void WriteAppendText(string filePath, string content)
        {
            File.AppendAllText(filePath, content);
        }


        #endregion
        

        /// <summary> 
        /// 將源文件的內容復制到目標文件中 
        /// </summary> 
        /// <param name="sourceFilePath">源文件的絕對路徑</param> 
        /// <param name="destFilePath">目標文件的絕對路徑</param> 
        public static void Copy(string sourceFilePath, string destFilePath)
        {
            File.Copy(sourceFilePath, destFilePath, true);
        }

        /// <summary> 
        /// 將文件移動到指定目錄 
        /// </summary> 
        /// <param name="sourceFilePath">需要移動的源文件的絕對路徑</param> 
        /// <param name="descDirectoryPath">移動到的目錄的絕對路徑</param> 
        public static void Move(string sourceFilePath, string descDirectoryPath)
        {
            //獲取源文件的名稱 
            string sourceFileName = GetFileName(sourceFilePath);
            if (IsExistDirectory(descDirectoryPath))
            {
                //如果目標中存在同名文件,則刪除 
                if (IsExistFile(descDirectoryPath + "\\" + sourceFileName))
                {
                    DeleteFile(descDirectoryPath + "\\" + sourceFileName);
                }
                //將文件移動到指定目錄 
                File.Move(sourceFilePath, descDirectoryPath + "\\" + sourceFileName);
            }
        }

        

   
        /// <summary> 
        /// 刪除指定文件 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param> 
        public static void DeleteFile(string filePath)
        {
            if (IsExistFile(filePath))
            {
                File.Delete(filePath);
            }
        }

        /// <summary> 
        /// 清空文件內容 
        /// </summary> 
        /// <param name="filePath">文件的絕對路徑</param>
        /// <param name="iscreatenew"></param> 
        public static void DeleteFile(string filePath,bool iscreatenew)
        {
            //刪除文件 
            if (IsExistFile(filePath))
            {
                File.Delete(filePath);
            }
            if (iscreatenew)
            {
                //重新創建該文件 
                CreateFile(filePath);
            }

          
        }


        #endregion


        
        #region 文件目錄相關操作方法

        #region Exist

         /// <summary> 
        /// 檢測指定目錄是否存在，如果存在則返回true。
        /// </summary> 
        /// <param name="directoryPath">目錄的絕對路徑</param>         
        public static bool IsExistDirectory(string directoryPath)
        {
            return Directory.Exists(directoryPath);
        }
        /// <summary> 
        /// 檢測指定目錄是否為空 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param>         
        public static bool IsEmptyDirectory(string directoryPath)
        {
            try
            {
                //判斷是否存在文件 
                string[] fileNames = GetFileNames(directoryPath);
                if (fileNames.Length > 0)
                {
                    return false;
                }
                //判斷是否存在文件夾 
                string[] directoryNames = GetDirectories(directoryPath);
                if (directoryNames.Length > 0)
                {
                    return false;
                }
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary> 
        /// 檢測指定目錄中是否存在指定的文件,若要搜索子目錄請使用重載方法. 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param> 
        /// <param name="searchPattern">模式字符串，"*"代表0或N個字符，"?"代表1個字符。 
        /// 范例："Log*.xml"表示搜索所有以Log開頭的Xml文件。</param>         
        public static bool IsContainsFile(string directoryPath, string searchPattern)
        {
            try
            {
                //獲取指定的文件列表 
                string[] fileNames = GetFileNames(directoryPath, searchPattern, false);
                //判斷指定文件是否存在 
                return fileNames.Length != 0;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary> 
        /// 檢測指定目錄中是否存在指定的文件
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param> 
        /// <param name="searchPattern">模式字符串，"*"代表0或N個字符，"?"代表1個字符。 
        /// 范例："Log*.xml"表示搜索所有以Log開頭的Xml文件。</param>  
        /// <param name="isSearchChild">是否搜索子目錄</param> 
        public static bool IsContainsFile(string directoryPath, string searchPattern, bool isSearchChild)
        {
            try
            {
                //獲取指定的文件列表 
                string[] fileNames = GetFileNames(directoryPath, searchPattern, true);
                //判斷指定文件是否存在 
                return fileNames.Length != 0;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        #endregion
       

        #region Create


        /// <summary> 
        /// 創建一個目錄 
        /// </summary> 
        /// <param name="directoryPath">目錄的絕對路徑</param> 
        public static void CreateDirectory(string directoryPath)
        {
            //如果目錄不存在則創建該目錄 
            if (!IsExistDirectory(directoryPath))
            {
                Directory.CreateDirectory(directoryPath);
            }
        }
        #endregion

        #region Get

        /// <summary> 
        /// 獲取指定目錄中所有子目錄列表,若要搜索嵌套的子目錄列表,請使用重載方法. 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param>         
        public static string[] GetDirectories(string directoryPath)
        {
            try
            {
                return Directory.GetDirectories(directoryPath);
            }
            catch (IOException ex)
            {
                throw ex;
            }
        }
        /// <summary> 
        /// 獲取指定目錄及子目錄中所有子目錄列表 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param> 
        /// <param name="searchPattern">模式字符串，"*"代表0或N個字符，"?"代表1個字符。 
        /// 范例："Log*.xml"表示搜索所有以Log開頭的Xml文件。</param> 
        /// <param name="isSearchChild">是否搜索子目錄</param> 
        public static string[] GetDirectories(string directoryPath, string searchPattern, bool isSearchChild)
        {
            try
            {
                if (isSearchChild)
                {
                    return Directory.GetDirectories(directoryPath, searchPattern, SearchOption.AllDirectories);
                }
                else
                {
                    return Directory.GetDirectories(directoryPath, searchPattern, SearchOption.TopDirectoryOnly);
                }
            }
            catch (IOException ex)
            {
                throw ex;
            }
        }

        #endregion


        #region 刪除方法
        /// <summary> 
        /// 刪除指定目錄及其所有子目錄 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param> 
        public static void DeleteDirectory(string directoryPath)
        {
            if (IsExistDirectory(directoryPath))
            {
                Directory.Delete(directoryPath, true);
            }
        }

        /// <summary> 
        /// 清空指定目錄下所有文件及子目錄,但該目錄依然保存. 
        /// </summary> 
        /// <param name="directoryPath">指定目錄的絕對路徑</param> 
        public static void ClearDirectory(string directoryPath)
        {
            if (IsExistDirectory(directoryPath))
            {
                //刪除目錄中所有的文件 
                string[] fileNames = GetFileNames(directoryPath);
                for (int i = 0; i < fileNames.Length; i++)
                {
                    DeleteFile(fileNames[i]);
                }
                //刪除目錄中所有的子目錄 
                string[] directoryNames = GetDirectories(directoryPath);
                for (int i = 0; i < directoryNames.Length; i++)
                {
                    DeleteDirectory(directoryNames[i]);
                }
            }
        }


        #endregion


        #endregion


        #region 將字節(B)轉換成兆(M)，并保留兩位小數
        /// <summary>
        /// 將字節(B)轉換成兆(M)，并保留兩位小數
        /// </summary>
        public static string ConvertByteToMB(int byteLength)
        {
            return Math.Round((double)byteLength / (1024 * 1024), 2).ToString() + "M";
        }
        #endregion
        #region 去除文件名中的特殊字符
        public static string ReplaceBadCharOfFileName(string fileName)
        {
            fileName = fileName.Replace("\\", string.Empty);
            fileName = fileName.Replace("/", string.Empty);
            fileName = fileName.Replace(":", string.Empty);
            fileName = fileName.Replace("*", string.Empty);
            fileName = fileName.Replace("?", string.Empty);
            fileName = fileName.Replace("\"", string.Empty);
            fileName = fileName.Replace("<", string.Empty);
            fileName = fileName.Replace(">", string.Empty);
            fileName = fileName.Replace("|", string.Empty);
            fileName = fileName.Replace(" ", string.Empty);
            return fileName.ToString();
        }
        #endregion
    }