C#搜索文字在文件及文件夹中出现位置的方法

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Search{ class Program { static void Main(string[] args) {  if (args.Length != 3 || (args[0] != "file" && args[0] != "folder"))  {  Console.WriteLine("Correct Order Style: ");  Console.WriteLine("Search file/folder address word");  }  switch (args[0])  {  case "file": //从文件中查找   {   if (System.IO.File.Exists(args[1]))   {    FindInFile(args[1], args[2]);   }   else   {    Console.WriteLine(string.Format(    "File {0} not exist!", args[1]));   }   }   break;  case "folder": //从文件夹中查找（包括其中全部文件）   {   if (System.IO.Directory.Exists(args[1]))   {    FindInDirectory(args[1], args[2]);   }   else   {    Console.WriteLine(string.Format(    "Directory {0} not exist!", args[1]));   }   }   break;  default: break;  }  Console.WriteLine("Output Finished.");  Console.ReadLine(); } /// <summary> /// 从文件中找关键字 /// </summary> /// <param name="filename"></param> /// <param name="word"></param> public static void FindInFile(string filename, string word) {  System.IO.StreamReader sr = System.IO.File.OpenText(filename);  string s = sr.ReadToEnd();  sr.Close();  string[] temp = s.Split('/n');  for (int i = 0; i < temp.Length; i++)  {  if (temp[i].IndexOf(word) != -1)  {   Console.WriteLine(string.Format(   "Found in: {0}/n{1}/nLine: {2} /n",   filename, temp[i].Trim(), i + 1));  }  } } /// <summary> /// 从文件夹中找关键字 /// </summary> /// <param name="foldername"></param> /// <param name="word"></param> public static void FindInDirectory(string foldername, string word) {  System.IO.DirectoryInfo dif = new System.IO.DirectoryInfo(foldername);  //遍历文件夹中的各子文件夹  foreach (System.IO.DirectoryInfo di in dif.GetDirectories())  {  FindInDirectory(di.FullName, word);  }  //查询文件夹中的各个文件  foreach (System.IO.FileInfo f in dif.GetFiles())  {  FindInFile(f.FullName, word);  } } }}