Question

我有像这样的字符串： '1小时' '5分钟' '1天' '30秒' '4小时'

这个字符串表示自某事以来的过去时间。我想将它们转换为它发生的时间（DateTime）

我试图将它插入到timespan.parse中，但它会抛出异常......

做这样的事情的最佳方式是什么？

由于

Answer 1

您可以尝试使用 Dictionary 来使用所有名称：

public static TimeSpan ParseTimeSpan(String value) {
  // Expand dictionary with values you're using, e.g. 
  // "second", "minute", "week" etc.
  Dictionary<String, long> seconds = new Dictionary<String, long>() {
    {"days", 86400},
    {"day", 86400},
    {"hours", 3600},
    {"hour", 3600},
    {"mins", 60},
    {"min", 60},
    {"secs", 1},
    {"sec", 1}
  };

  String[] items = value.Split();

  long result = 0;

  for (int i = 0; i < items.Length - 1; i += 2)
    result += long.Parse(items[i]) * seconds[items[i + 1]];

  return TimeSpan.FromSeconds(result);
}

... 

TimeSpan result = ParseTimeSpan("1 hour 15 mins 32 secs");

Answer 2

字符串中的第二部分是单位。

Dunno关于格式化你将拥有的内容，但所有这些内容都可以像这样拆分和解析：

// text is "1 hour" or "5 mins" or "1 day" or "30 secs" or "4 hours"
var item = text.Split(new char[] {' '});
var value = int.Parse(item[0]);
var unit = item[1];
// get lowest units, in our case it is seconds
if(unit.StartWith("min"))
    value *= 60;
else
    if(unit.StartWith("hour"))
        value *= 60 * 60;
    else
        if(unit.StartWith("day"))
            value *= 60 * 60 * 24;
// now that we have seconds, we can convert it into timespan
var timespan = new TimeSpan(0, 0, value);

您可以为 ms 甚至 ticks 执行此操作。

Answer 3

        string strResultTime = "5 hours";

        //The function that gets the time and converts it to seconds
        MatchEvaluator evaluator = new MatchEvaluator(ConvertToSeconds);


        strResultTime = Regex.Replace(strResultTime, "(?<num>\\d+?) (?<timeUnit>.+)", evaluator);

        //Parse the seconds to an actual datetime.
        DateTime indexTime = DateTime.Now.AddSeconds(int.Parse(strResultTime) * -1);


    /// <summary>
    /// Converts strings if format 'X time' like '2 mins' or '5 hours' to the time that they represents in seconds
    /// </summary>
    /// <param name="mchTime">Match that contains '2 mins' and Groups["timeUnit"] = 'hour' or other time unit AND Groups["num"] = the number of that time unit</param>
    /// <returns>The number of seconds as string</returns>
    private string ConvertToSeconds(Match mchTime)
    {
        //Switch on the time unit
        switch (mchTime.Groups["timeUnit"].Value)
        {
            case "day":
            case "days":
                //Return the number of days as seconds
                return (int.Parse(mchTime.Groups["num"].Value) * 24 * 60 * 60).ToString();
            case "hour":
            case "hours":
                //Return the number of hours as seconds
                return (int.Parse(mchTime.Groups["num"].Value) * 60 * 60).ToString();
            case "min":
            case "mins":
                //Return the number of mins as seconds
                return (int.Parse(mchTime.Groups["num"].Value) * 60).ToString();
            case "sec":
            case "secs":
                return mchTime.Groups["num"].Value;
            default:
                throw new NotImplementedException();
        }
    }

Answer 4

DateTime.Parse has an overloaded version that allows you to pass an `IFormatProvider`. Creating a class that implements `IFormatProvider` to convert your strings how you want them parsed, and pass an instance of this class to `TimeSpan.Parse` as a second argument. This would be the approach I would take.

Answer 5

使用类似“1：5”的字符串和TimeSpan.TryParse

将timepan的字符串表示形式转换为timespan对象

5 个答案: