Question

我有下一个文件：timesBetweenStartToEnd.txt，其中包含：

Starting at: 12:15:28 -> Ending at: 12:17:38 -> 130 Seconds
Starting at: 12:12:18 -> Ending at: 12:12:38 -> 20 Seconds
.....

我希望按秒数对其进行排序，并将已排序的行插入另一个文件中：logTimes.txt。

我尝试了下一件事：

string[] scores = System.IO.File.ReadAllLines("timesBetweenStartToEnd.txt");
var orderedScores = scores.OrderByDescending(x => int.Parse(x.Split(' ')[8]
.Substring(0,scores.IndexOf(" "))); // here I have an error because of `scores.`, I neead an index

foreach (var score in orderedScores)
{
     System.IO.File.AppendAllText(@"logTimes.txt", string.Format("{0}{1}", orderedScores, Environment.NewLine));
}

所以，logTimes.txt应该包含（降序）：

Starting at: 12:15:28 -> Ending at: 12:17:38 -> 130 Seconds
Starting at: 12:12:18 -> Ending at: 12:12:38 -> 20 Seconds

任何帮助表示赞赏！

Answer 1

如果格式严格，这可以有效地工作：

var orderedLines = File.ReadLines("timesBetweenStartToEnd.txt")
    .Select(l =>
    {
        int secondsIndex = l.LastIndexOf(" -> ");
        int? sec = (int?)null;
        if(secondsIndex != -1)
        {
            secondsIndex += " -> ".Length;
            int secondEndIndex = l.IndexOf(" Seconds", secondsIndex);
            if (secondEndIndex != -1)
            {
                int length = secondEndIndex - secondsIndex;
                string secondsPart = l.Substring(secondsIndex, length).Trim();
                int seconds;
                if (int.TryParse(secondsPart, out seconds))
                    sec = (int?)seconds;
            }
        }
        return new { Line = l, Seconds = sec };
    })
    .OrderBy(x => x.Seconds)
    .Select(x => x.Line);
File.WriteAllLines("logTimes.txt", orderedLines);

由于我选择了Nullable<int>，如果您只想记录有效行，则只需添加Where即可：

...
.Where(x => x.Seconds.HasValue)
.OrderBy(x => x.Seconds.Value)
.Select(x => x.Line);

Answer 2

问题是您尝试引用由lambda语句处理的当前数组elemt。但是在你的声明中你不使用它，而是使用整个数组。将行更改为：

var orderedScores = scores.OrderByDescending(x => int.Parse(x.Split(' ')[8]
.Substring(0,x.IndexOf(" ")));

Answer 3

尝试使用以下更正：

string[] scores = System.IO.File.ReadAllLines("timesBetweenStartToEnd.txt");
var orderedScores = scores.OrderBy(x => int.Parse(x.Split(' ')[8].Split(' ')[0]));

foreach (var score in orderedScores)
{
     System.IO.File.AppendAllText(@"logTimes.txt", string.Format("{0}{1}", score, Environment.NewLine));
}

请注意，此解决方案对正确的语法很敏感，如果任何行与您的示例行不匹配，则会抛出异常。

Answer 4

var orderedScores = scores.OrderBy(x => int.Parse(x.Substring(x.LastIndexOf("->"),  
x.IndexOf("Seconds") - x.LastIndexOf("->")).Trim("-->".ToCharArray()).Trim()));

如果您根据最后的秒值进行排列。这可能对你有帮助

按每行的编号对文件进行排序，并将其插入另一个文件

4 个答案: