Question

我有一个包含此内容的.txt文件，例如：

1
Hey, how are u
Ist everything ok ? 
I hope u are well 

2 I'm fine thanks 
Nice to hear from u 


3 Sounds great 
What are u doing now ? 
Hope u enjoy your stay

我需要一个可以给出数字的方法，例如2，程序应该在新的txt文件中将数字2之后的整个文本复制到数字3。楼下我发布了一个如何识别线路的解决方案，但现在我不知道如何复制文件的某个部分

Answer 1

public static void RunSnippet()
{
    string input =
    "1 Hey, how are u\n" +
    "\n" +
    "2 I'm fine thanks\n" +
    "\n" +
    "3 Sounds great";

    Console.WriteLine(GetLine(3, input));
}

static string GetLine(int number, string content)
{
    return Regex.Split(content, "\n").First(l=> l.StartsWith(number.ToString()));
}

Answer 2

使用正则表达式

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string input =
               "1 Hey, how are u\n" +
               "\n" +
               "2 I'm fine thanks\n" +
               "\n" +
               "3 Sounds great";

            string pattern = @"^(?'index'\d+)\s+(?'value'.*)";
            Regex expr = new Regex(pattern, RegexOptions.Multiline);

            MatchCollection matches = expr.Matches(input);

            Dictionary<int, string> dict = new Dictionary<int, string>();
            foreach(Match match in matches)
            {
                dict.Add(int.Parse(match.Groups["index"].Value), match.Groups["value"].Value); 
            }

            string sentence2 = dict[2];

        }
    }
}

在.txt文件中搜索特定行并将其复制到另一个文件中c＃

2 个答案: