using System;
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using System.Collections.Generic;
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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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namespace IStation.Untity
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{
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/// <summary>
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/// 文件辅助类
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/// </summary>
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public class FileHelper
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{
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/// <summary>
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///文件夹中不能包含的字符列表
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/// </summary>
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public static List<string> DisableStrList = new List<string> { "\\", "/", "*", "?", "\"", "<", ">", "|", ":" };
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// 私有变量
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private List<FileInfo> _lst = null;
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/// <summary>
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/// 获得目录下所有文件或指定文件类型文件(包含所有子文件夹)
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/// </summary>
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/// <param name="path"></param>
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/// <param name="extName">扩展名可以多个 例如 .mp3.wma.rm</param>
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/// <returns></returns>
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public List<FileInfo> GetFile(string path, string extName)
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{
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_lst = new List<FileInfo>();
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getdir2(path, extName);
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return _lst;
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}
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/// <summary>
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/// 获得目录下所有文件或指定文件类型文件(包含所有子文件夹)
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/// </summary>
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/// <param name="path"></param>
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/// <returns></returns>
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public List<FileInfo> GetFile(string path)
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{
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_lst = new List<FileInfo>();
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getdir1(path);
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return _lst;
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}
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// 私有方法,递归获取指定类型文件,包含子文件夹
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private void getdir2(string path, string extName)
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{
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try
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{
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string[] dir = Directory.GetDirectories(path); //文件夹列表
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DirectoryInfo fdir = new DirectoryInfo(path);
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FileInfo[] file = fdir.GetFiles();
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//FileInfo[] file = Directory.GetFiles(path); //文件列表
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if (file.Length != 0 || dir.Length != 0) //当前目录文件或文件夹不为空
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{
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foreach (FileInfo f in file) //显示当前目录所有文件
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{
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if (extName.ToLower().IndexOf(f.Extension.ToLower()) >= 0)
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{
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_lst.Add(f);
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}
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}
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foreach (string d in dir)
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{
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getdir2(d, extName);//递归
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}
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}
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}
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catch (Exception ex)
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{
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throw ex;
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}
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}
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// 私有方法,递归获取指定类型文件,包含子文件夹
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private void getdir1(string path)
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{
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try
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{
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string[] dir = Directory.GetDirectories(path); //文件夹列表
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DirectoryInfo fdir = new DirectoryInfo(path);
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FileInfo[] file = fdir.GetFiles();
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//FileInfo[] file = Directory.GetFiles(path); //文件列表
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if (file.Length != 0 || dir.Length != 0) //当前目录文件或文件夹不为空
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{
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foreach (FileInfo f in file) //显示当前目录所有文件
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{
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_lst.Add(f);
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}
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foreach (string d in dir)
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{
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getdir1(d);//递归
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}
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}
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}
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catch (Exception ex)
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{
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throw ex;
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}
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}
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/// <summary>
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/// 获取文件夹下的所有文件夹（包含子文件夹）
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/// </summary>
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public static List<DirectoryInfo> GetFolders(string path)
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{
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try
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{
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List<DirectoryInfo> list = new List<DirectoryInfo>();
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var dir_root = new DirectoryInfo(path);
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var dir_root_subs = dir_root.GetDirectories();
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if (dir_root_subs != null && dir_root_subs.Length > 0)
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{
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foreach (var dir in dir_root_subs)
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{
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list.Add(dir);
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var folders_sub = GetFolders(dir);
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if (folders_sub != null && folders_sub.Count > 0)
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list.AddRange(folders_sub);
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}
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}
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return list;
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}
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catch (Exception ex)
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{
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throw ex;
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}
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}
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//递归获取
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private static List<DirectoryInfo> GetFolders(DirectoryInfo directoryInfo)
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{
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List<DirectoryInfo> list = new List<DirectoryInfo>();
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var dir_subs = directoryInfo.GetDirectories();
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if (dir_subs != null && dir_subs.Length > 0)
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{
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foreach (var dir in dir_subs)
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{
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list.Add(dir);
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var folders_sub = GetFolders(dir);
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if (folders_sub != null && folders_sub.Count > 0)
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list.AddRange(folders_sub);
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}
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}
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return list;
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}
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/// 给定文件的路径，读取文件的二进制数据，判断文件的编码类型
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/// <param name="FILE_NAME">文件路径</param>
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/// <returns>文件的编码类型</returns>
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public static System.Text.Encoding GetEncoding(string FILE_NAME)
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{
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System.IO.FileStream fs = new System.IO.FileStream(FILE_NAME, System.IO.FileMode.Open,
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System.IO.FileAccess.Read);
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System.Text.Encoding r = GetEncoding(fs);
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fs.Close();
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return r;
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}
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/// 通过给定的文件流，判断文件的编码类型
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/// <param name="fs">文件流</param>
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/// <returns>文件的编码类型</returns>
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public static System.Text.Encoding GetEncoding(System.IO.FileStream fs)
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{
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byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
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byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
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byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM
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System.Text.Encoding reVal = System.Text.Encoding.Default;
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System.IO.BinaryReader r = new System.IO.BinaryReader(fs, System.Text.Encoding.Default);
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int i;
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int.TryParse(fs.Length.ToString(), out i);
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byte[] ss = r.ReadBytes(i);
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if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF))
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{
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reVal = System.Text.Encoding.UTF8;
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}
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else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00)
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{
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reVal = System.Text.Encoding.BigEndianUnicode;
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}
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else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41)
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{
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reVal = System.Text.Encoding.Unicode;
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}
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r.Close();
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return reVal;
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}
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/// 判断是否是不带 BOM 的 UTF8 格式
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/// <param name="data"></param>
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/// <returns></returns>
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private static bool IsUTF8Bytes(byte[] data)
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{
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int charByteCounter = 1; //计算当前正分析的字符应还有的字节数
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byte curByte; //当前分析的字节.
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for (int i = 0; i < data.Length; i++)
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{
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curByte = data[i];
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if (charByteCounter == 1)
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{
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if (curByte >= 0x80)
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{
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//判断当前
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while (((curByte <<= 1) & 0x80) != 0)
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{
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charByteCounter++;
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}
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//标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X
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if (charByteCounter == 1 || charByteCounter > 6)
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{
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return false;
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}
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}
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}
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else
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{
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//若是UTF-8 此时第一位必须为1
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if ((curByte & 0xC0) != 0x80)
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{
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return false;
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}
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charByteCounter--;
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}
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}
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if (charByteCounter > 1)
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{
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throw new Exception("非预期的byte格式");
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}
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return true;
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}
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/// <summary>
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/// 读取全部文本
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/// </summary>
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public static string ReadAllText(string fileName)
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{
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if (string.IsNullOrEmpty(fileName))
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return default;
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if (!File.Exists(fileName))
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return default;
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var encoding = GetEncoding(fileName);
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return File.ReadAllText(fileName, encoding);
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}
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/// <summary>
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/// 读取全部行
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/// </summary>
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public static List<string> ReadAllLines(string fileName)
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{
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if (string.IsNullOrEmpty(fileName))
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return default;
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if (!File.Exists(fileName))
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return default;
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var encoding = GetEncoding(fileName);
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return File.ReadAllLines(fileName, encoding)?.ToList();
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}
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}
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}
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