在C#中读取和删除.txt文件中的随机行

using System;
using System.IO;

string filePath = "path/to/file.txt";
using (StreamReader sr = new StreamReader(filePath))
{
    string line;
    while ((line = sr.ReadLine()) != null)
    {
        // 处理每一行的内容
    }
}

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

string filePath = "path/to/file.txt";
List<string> lines = new List<string>();

using (StreamReader sr = new StreamReader(filePath))
{
    string line;
    while ((line = sr.ReadLine()) != null)
    {
        lines.Add(line);
    }
}

Random random = new Random();
int randomIndex = random.Next(0, lines.Count);
string randomLine = lines[randomIndex];

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

string filePath = "path/to/file.txt";
string tempFilePath = "path/to/temp.txt";
List<string> lines = new List<string>();

using (StreamReader sr = new StreamReader(filePath))
{
    string line;
    while ((line = sr.ReadLine()) != null)
    {
        lines.Add(line);
    }
}

Random random = new Random();
int randomIndex = random.Next(0, lines.Count);
lines.RemoveAt(randomIndex);

using (StreamWriter sw = new StreamWriter(tempFilePath))
{
    foreach (string line in lines)
    {
        sw.WriteLine(line);
    }
}

File.Delete(filePath);
File.Move(tempFilePath, filePath);