c# - 如何使用 C# 修改文本文件中的特定行？

Question

我有这样的电影字幕的 srt 文件:

1
00:00:00,082 --> 00:00:04,352
bbb bbb bb
bbbb

2
00:00:08,486 --> 00:00:12,662
bbb bbb bbb

3
00:00:12,824 --> 00:00:14,963
bbb
bbbb bb

我想给分钟添加常量值(这样字幕会稍后显示)。我该怎么做？

我已经有了这个代码:

class MainClass
{

    public static void Main (string[] args)
    {
        StringBuilder sb = new StringBuilder();

        using(FileStream fs = new FileStream(@"sb.srt",FileMode.Open,FileAccess.ReadWrite))
        {
            using(StreamReader sr = new StreamReader(fs))
            {
                while( sr.Read()!=-1 )
                {
                    sb.AppendLine(sr.ReadLine());
                }
            }
        }
    }
}

Answer 1

这是一个完整的程序。只需将时间跨度更改为您要添加的数量即可

const string format = @"hh\:mm\:ss\,fff";
        static void Main(string[] args)
        {
            string input = File.ReadAllText("sb.srt");
            Regex r = new Regex(@"(\d\d):(\d\d):(\d\d),(\d\d\d)");
            input = r.Replace(input, m=> AddTime(m));
            File.WriteAllText("sb.srt", input);
        }

        private static string AddTime(Match m)
        {
            TimeSpan t = TimeSpan.ParseExact(m.Value, format, CultureInfo.InvariantCulture);
            t += new TimeSpan(0, 1, 0);
            return t.ToString(format);
        }