C ＃ method to read the text content of all files in the local folder

1. Understand the test C# Read local txt Method of text content , stay Unity Read local files in the test ,txt The text encoding format is ANSI When , Chinese output is garbled ;txt The text encoding format is unicode、unicode big endian、utf-8 When , Chinese can be output normally .
   Here are two kinds of reading txt Method of text content ：（ Remember to quote using System.IO）

string path = "C:\\Users\\hahaha\\Desktop\\test";

      // Method 1 

      DirectoryInfo directoryInfo = new DirectoryInfo(path);

      FileInfo[] files = directoryInfo.GetFiles();

      for (int i = 0; i < files.Length; i++)

      {
    

          if(files[i].Extension.Equals(".txt"))   // Judge whether it is txt file 

          {
    

              string[] strs = File.ReadAllLines(path + "\\" + files[i].Name);	// Full path of text file 

              for (int j = 0; j < strs.Length; j++)

              {
    

                  Debug.Log("$$$$$$" + strs[j].ToString());

              }

          }

      }



      // Method 2 

     string[] strPath = Directory.GetFiles(path, "*.txt");  // Read only txt file , What you get is an all inclusive txt Character array of file path 

     foreach(string p in strPath)

      {
    

          string[] strs3 = File.ReadAllLines(p);  // Content branch read 

          for (int j = 0; j < strs3.Length; j++)

          {
    

              Debug.Log("&&&&&&" + strs3[j].ToString());

          }



          string ss = File.ReadAllText(p);    // Read all contents 

          Debug.Log("%%%" + ss);

          

          foreach(var line in File.ReadLines(p))  // Content branch iterative reading 

          {
    

              Debug.Log("@@@@" + line.ToString());    

          }

      }

2. In method 2 File The difference between the three reading methods ：

（1）ReadAllLines and ReadAllText The difference between ：

File.ReadAllLines() Returns an array of strings . Each string contains a line of the file .
File.ReadAllText() Returns a single string containing all lines of the file . 

（2）ReadAllLines and ReadLines The difference between

File.ReadAllLines() Method reads the entire file at once and returns a string [] Array , Therefore, it takes time to use large files , Users are not recommended to wait , Until the whole array is returned .
File.ReadLines() Return to one IEnumerable< string> And it doesn't read the whole file at once , So when using large files , This is a better choice .