.NET(C#) File类的常用方法

MSDN的File类

File类在MSDN：https://msdn.microsoft.com/zh-cn/library/system.io.file_methods(v=vs.110).aspx

FileHelper.cs

FileHelper提供的功能：

1. 递归获取指定目录下所有的文件
2. 获取指定目录下所有的子目录

using System;
using System.Collections.Generic;
using System.IO;

public class FileHelper
{
    /// <summary>
    /// 递归获取所有的目录
    /// </summary>
    /// <param name="strPath"></param>
    /// <param name="lstDirect"></param>
    public static void GetAllDirectorys(string strPath, ref List<string> lstDirect)
    {
        if (Directory.Exists(strPath) == false)
        {
            Console.WriteLine("请检查，路径不存在：{0}",strPath);
            return;
        }
        DirectoryInfo diFliles = new DirectoryInfo(strPath);
        DirectoryInfo[] directories = diFliles.GetDirectories();
        var max = directories.Length;
        for (int dirIdx = 0; dirIdx < max; dirIdx++)
        {
            try
            {
                var dir = directories[dirIdx];
                //dir.FullName是某个子目录的绝对地址，把它记录起来
                lstDirect.Add(dir.FullName);
                GetAllDirectorys(dir.FullName, ref lstDirect);
            }
            catch
            {
                continue;
            }
        }
    }

    /// <summary>  
    /// 遍历当前目录及子目录，获取所有文件 
    /// </summary>  
    /// <param name="strPath">文件路径</param>  
    /// <returns>所有文件</returns>  
    public static IList<FileInfo> GetAllFiles(string strPath)
    {
        List<FileInfo> lstFiles = new List<FileInfo>();
        List<string> lstDirect = new List<string>();
        lstDirect.Add(strPath);
        DirectoryInfo diFliles = null;
        GetAllDirectorys(strPath, ref lstDirect);

        var max = lstDirect.Count;
        for (int idx = 0; idx < max; idx++)
        {
            try
            {
                diFliles = new DirectoryInfo(lstDirect[idx]);
                lstFiles.AddRange(diFliles.GetFiles());
            }
            catch
            {
                continue;
            }
        }
        return lstFiles;
    }
}

File类实用方法

获取父目录

var currentDirectory = System.Environment.CurrentDirectory;//当前程序的目录
var parentDirPath = string.Empty;
var parentDir = new DirectoryInfo(currentDirectory).Parent;
if (parentDir != null)
{
    parentDirPath = parentDir.FullName; //上一级目录
}
else
{
    Console.WriteLine("ERROR：当前目录没有父级目录");
}

读取和修改文本内容

//读取所有内容
var fileContent = File.ReadAllText(versionFileName);
//修改文本内容
File.WriteAllText(versionFileName, strNewVer);

方法二

参考文档：https://msdn.microsoft.com/zh-cn/library/8bh11f1k.aspx

using (var sw = new StreamWriter(FilePath))
{
	sw.Write(sb.ToString());
}

　　

创建文本并写入内容

using (StreamWriter streamWriter = File.CreateText(resFileName))
{
    var fileInfos = FileHelper.GetAllFiles(targetPath);
    var fileMax = fileInfos.Count;
    for (int fileIdx = 0; fileIdx < fileMax; fileIdx++)
    {
        var fileInfo = fileInfos[fileIdx];
        if (fileInfo.Extension != ".meta")
        {
            var filePath = fileInfo.FullName.Replace(parentDirPath, "");
            filePath = filePath.Replace(@"", "/");
            var fileStr = string.Concat(filePath, "&", HashHelper.GetSHA1(fileInfo.FullName));
            streamWriter.WriteLine(fileStr);
            Console.WriteLine(fileStr);
            if (fileLine < Int64.MaxValue)
            {
                fileLine += 1;
            }
            else
            {
                overflowMsg = "文件行数太多啦，未统计。";
            }
        }
    }
}

@ 文件路径

var filePath = @"d:Tools"; 等价于  var filePath = "d:\Tools\";