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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.OleDb;
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using System.IO;
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using System.Linq;
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using System.Text;
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using VOL.Core.Extensions;
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namespace VOL.Core.Utilities
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{
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public class FileHelper
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{
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private static object _filePathObj = new object();
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/// <summary>
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/// 通过迭代器读取平面文件行内容(必须是带有\r\n换行的文件,百万行以上的内容读取效率存在问题,适用于100M左右文件，行100W内，超出的会有卡顿)
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/// </summary>
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/// <param name="fullPath">文件全路径</param>
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/// <param name="page">分页页数</param>
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/// <param name="pageSize">分页大小</param>
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/// <param name="seekEnd"> 是否最后一行向前读取,默认从前向后读取</param>
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/// <returns></returns>
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public static IEnumerable<string> ReadPageLine(string fullPath, int page, int pageSize, bool seekEnd = false)
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{
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if (page <= 0)
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{
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page = 1;
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}
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fullPath = fullPath.ReplacePath();
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var lines = File.ReadLines(fullPath, Encoding.UTF8);
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if (seekEnd)
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{
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int lineCount = lines.Count();
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int linPageCount = (int)Math.Ceiling(lineCount / (pageSize * 1.00));
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//超过总页数，不处理
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if (page > linPageCount)
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{
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page = 0;
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pageSize = 0;
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}
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else if (page == linPageCount)//最后一页，取最后一页剩下所有的行
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{
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pageSize = lineCount - (page - 1) * pageSize;
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if (page == 1)
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{
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page = 0;
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}
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else
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{
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page = lines.Count() - page * pageSize;
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}
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}
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else
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{
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page = lines.Count() - page * pageSize;
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}
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}
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else
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{
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page = (page - 1) * pageSize;
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}
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lines = lines.Skip(page).Take(pageSize);
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var enumerator = lines.GetEnumerator();
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int count = 1;
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while (enumerator.MoveNext() || count <= pageSize)
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{
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yield return enumerator.Current;
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count++;
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}
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enumerator.Dispose();
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}
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public static bool FileExists(string path)
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{
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return File.Exists(path.ReplacePath());
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}
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public static string GetCurrentDownLoadPath()
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{
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return ("Download\\").MapPath();
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}
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public static bool DirectoryExists(string path)
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{
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return Directory.Exists(path.ReplacePath());
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}
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public static string Read_File(string fullpath, string filename, string suffix)
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{
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return ReadFile((fullpath + "\\" + filename + suffix).MapPath());
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}
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public static string ReadFile(string fullName)
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{
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// Encoding code = Encoding.GetEncoding(); //Encoding.GetEncoding("gb2312");
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string temp = fullName.MapPath().ReplacePath();
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string str = "";
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if (!File.Exists(temp))
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{
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return str;
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}
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StreamReader sr = null;
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try
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{
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sr = new StreamReader(temp);
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str = sr.ReadToEnd(); // 读取文件
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}
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catch { }
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sr?.Close();
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sr?.Dispose();
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return str;
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}
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/// <summary>
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/// 取后缀名
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/// </summary>
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/// <param name="filename">文件名</param>
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/// <returns>.gif|.html格式</returns>
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public static string GetPostfixStr(string filename)
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{
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int start = filename.LastIndexOf(".");
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int length = filename.Length;
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string postfix = filename.Substring(start, length - start);
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return postfix;
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="path">路径 </param>
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/// <param name="fileName">文件名</param>
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/// <param name="content">写入的内容</param>
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/// <param name="appendToLast">是否将内容添加到未尾,默认不添加</param>
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public static void WriteFile(string path, string fileName, string content, bool appendToLast = false)
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{
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path = path.ReplacePath();
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fileName = fileName.ReplacePath();
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if (!Directory.Exists(path))//如果不存在就创建file文件夹
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Directory.CreateDirectory(path);
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using (FileStream stream = File.Open(path + fileName, FileMode.OpenOrCreate, FileAccess.Write))
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{
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byte[] by = Encoding.Default.GetBytes(content);
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if (appendToLast)
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{
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stream.Position = stream.Length;
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}
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else
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{
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stream.SetLength(0);
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}
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stream.Write(by, 0, by.Length);
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}
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}
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/// <summary>
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/// 追加文件
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/// </summary>
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/// <param name="Path">文件路径</param>
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/// <param name="strings">内容</param>
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public static void FileAdd(string Path, string strings)
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{
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StreamWriter sw = File.AppendText(Path.ReplacePath());
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sw.Write(strings);
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sw.Flush();
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sw.Close();
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sw.Dispose();
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}
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/// <summary>
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/// 拷贝文件
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/// </summary>
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/// <param name="OrignFile">原始文件</param>
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/// <param name="NewFile">新文件路径</param>
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public static void FileCoppy(string OrignFile, string NewFile)
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{
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File.Copy(OrignFile.ReplacePath(), NewFile.ReplacePath(), true);
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}
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/// <summary>
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/// 删除文件
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/// </summary>
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/// <param name="Path">路径</param>
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public static void FileDel(string Path)
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{
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File.Delete(Path.ReplacePath());
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}
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/// <summary>
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/// 移动文件
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/// </summary>
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/// <param name="OrignFile">原始路径</param>
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/// <param name="NewFile">新路径</param>
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public static void FileMove(string OrignFile, string NewFile)
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{
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File.Move(OrignFile.ReplacePath(), NewFile.ReplacePath());
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}
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/// <summary>
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/// 在当前目录下创建目录
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/// </summary>
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/// <param name="OrignFolder">当前目录</param>
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/// <param name="NewFloder">新目录</param>
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public static void FolderCreate(string OrignFolder, string NewFloder)
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{
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Directory.SetCurrentDirectory(OrignFolder.ReplacePath());
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Directory.CreateDirectory(NewFloder.ReplacePath());
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}
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/// <summary>
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/// 创建文件夹
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/// </summary>
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/// <param name="Path"></param>
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public static void FolderCreate(string Path)
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{
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// 判断目标目录是否存在如果不存在则新建之
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if (!Directory.Exists(Path.ReplacePath()))
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Directory.CreateDirectory(Path.ReplacePath());
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}
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public static void FileCreate(string Path)
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{
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FileInfo CreateFile = new FileInfo(Path.ReplacePath()); //创建文件
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if (!CreateFile.Exists)
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{
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FileStream FS = CreateFile.Create();
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FS.Close();
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}
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}
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/// <summary>
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/// 递归删除文件夹目录及文件
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/// </summary>
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/// <param name="dir"></param>
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/// <returns></returns>
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public static void DeleteFolder(string dir)
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{
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dir = dir.ReplacePath();
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if (Directory.Exists(dir)) //如果存在这个文件夹删除之
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{
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foreach (string d in Directory.GetFileSystemEntries(dir))
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{
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if (File.Exists(d))
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File.Delete(d); //直接删除其中的文件
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else
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DeleteFolder(d); //递归删除子文件夹
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}
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Directory.Delete(dir, true); //删除已空文件夹
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}
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}
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/// <summary>
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/// 指定文件夹下面的所有内容copy到目标文件夹下面
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/// </summary>
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/// <param name="srcPath">原始路径</param>
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/// <param name="aimPath">目标文件夹</param>
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public static void CopyDir(string srcPath, string aimPath)
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{
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try
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{
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aimPath = aimPath.ReplacePath();
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// 检查目标目录是否以目录分割字符结束如果不是则添加之
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if (aimPath[aimPath.Length - 1] != Path.DirectorySeparatorChar)
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aimPath += Path.DirectorySeparatorChar;
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// 判断目标目录是否存在如果不存在则新建之
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if (!Directory.Exists(aimPath))
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Directory.CreateDirectory(aimPath);
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// 得到源目录的文件列表，该里面是包含文件以及目录路径的一个数组
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//如果你指向copy目标文件下面的文件而不包含目录请使用下面的方法
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//string[] fileList = Directory.GetFiles(srcPath);
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string[] fileList = Directory.GetFileSystemEntries(srcPath.ReplacePath());
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//遍历所有的文件和目录
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foreach (string file in fileList)
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{
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//先当作目录处理如果存在这个目录就递归Copy该目录下面的文件
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if (Directory.Exists(file))
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CopyDir(file, aimPath + Path.GetFileName(file));
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//否则直接Copy文件
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else
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File.Copy(file, aimPath + Path.GetFileName(file), true);
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}
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}
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catch (Exception ee)
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{
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throw new Exception(ee.ToString());
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}
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}
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/// <summary>
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/// 获取文件夹大小
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/// </summary>
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/// <param name="dirPath">文件夹路径</param>
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/// <returns></returns>
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public static long GetDirectoryLength(string dirPath)
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{
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dirPath = dirPath.ReplacePath();
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if (!Directory.Exists(dirPath))
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return 0;
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long len = 0;
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DirectoryInfo di = new DirectoryInfo(dirPath);
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foreach (FileInfo fi in di.GetFiles())
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{
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len += fi.Length;
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}
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DirectoryInfo[] dis = di.GetDirectories();
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if (dis.Length > 0)
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{
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for (int i = 0; i < dis.Length; i++)
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{
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len += GetDirectoryLength(dis[i].FullName);
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}
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}
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return len;
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}
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/// <summary>
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/// 获取指定文件详细属性
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/// </summary>
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/// <param name="filePath">文件详细路径</param>
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/// <returns></returns>
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public static string GetFileAttibe(string filePath)
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{
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string str = "";
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filePath = filePath.ReplacePath();
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System.IO.FileInfo objFI = new System.IO.FileInfo(filePath);
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str += "详细路径:" + objFI.FullName + "<br>文件名称:" + objFI.Name + "<br>文件长度:" + objFI.Length.ToString() + "字节<br>创建时间" + objFI.CreationTime.ToString() + "<br>最后访问时间:" + objFI.LastAccessTime.ToString() + "<br>修改时间:" + objFI.LastWriteTime.ToString() + "<br>所在目录:" + objFI.DirectoryName + "<br>扩展名:" + objFI.Extension;
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return str;
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}
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}
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}
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