C#逐行读取文本文件的几种有效方法

File.ReadLines(FileName);

using System;
using System.Collections.Generic;
using System.IO;
 
public class ReadFile
{
    public static void Main()
    {
      string FileToRead = @"D:\New folder\textfile.txt";
      // Creating enumerable object  
      IEnumerable<string> line = File.ReadLines(FileToRead);
      Console.WriteLine(String.Join(Environment.NewLine, line));   
    }
}

// All the text, the file contains will display here.

File.ReadAllLines(FileName);

using System;
using System.IO;
 
public class ReadFile
{
    public static void Main()
    {
      string FileToRead = @"D:\New folder\textfile.txt";
      // Creating string array  
      string[] lines = File.ReadAllLines(FileToRead);
      Console.WriteLine(String.Join(Environment.NewLine, lines));   
    }
}

// All the text, the file contains will display here.

//We have to create Streader Object to use this method
StreamReader ObjectName = new StreamReader(FileName);
ObjectName.ReadLine();

using System;
using System.IO;
 
public class ReadFile
{
    public static void Main()
    {
      string FileToRead = @"D:\New folder\textfile.txt";
      using (StreamReader ReaderObject = new StreamReader(FileToRead))
      {
          string Line;
          // ReaderObject reads a single line, stores it in Line string variable and then displays it on console
          while((Line = ReaderObject.ReadLine()) != null)
          {
              Console.WriteLine(Line);
          }
      }
        
    }
}

// All the text, the file contains will display here.