Convert string to TimeSpan

问题

I need to convert this into a timespan:

8
8.3
8.15

When I do it like so:

DateTime s = booking.TourStartDate.Add(TimeSpan.Parse(booking.TourStartTime.Replace(".", ":")));

It will end up adding say '10' (10am) into days rather than the time that it is, albeit in a stupid format that it is.

回答1:

You could do it the straightforward way:

static Regex myTimePattern = new Regex( @"^(\d+)(\.(\d+))?$") ;
static TimeSpan MyString2Timespan( string s )
{
  if ( s == null ) throw new ArgumentNullException("s") ;
  Match m = myTimePattern.Match(s) ;
  if ( ! m.Success ) throw new ArgumentOutOfRangeException("s") ;
  string hh = m.Groups[1].Value ;
  string mm = m.Groups[3].Value.PadRight(2,'0') ;
  int hours   = int.Parse( hh ) ;
  int minutes = int.Parse( mm ) ;
  if ( minutes < 0 || minutes > 59 ) throw new ArgumentOutOfRangeException("s") ;
  TimeSpan value = new TimeSpan(hours , minutes , 0 ) ;
  return value ;
}

回答2:

You could try the following:

var ts = TimeSpan.ParseExact("0:0", @"h\:m",
                             CultureInfo.InvariantCulture);

回答3:

top of my head something like

string[] time = booking.TourStartTime.Split('.');

int hours = Convert.ToInt32(time[0]);
int minutes = (time.Length == 2) ? Convert.ToInt32(time[1]) : 0;

if(minutes == 3) minutes = 30;

TimeSpan ts = new TimeSpan(0,hours,minutes,0);

I'm not sure what your goal is with minutes though. If you want 8.3 to be 8:30 then what would 8.7 be? If it's only on 15 minute intervals (15,3,45) you can just do like i did in the example.

回答4:

this works for the examples given:

double d2 = Convert.ToDouble("8"); //convert to double
string s1 = String.Format("{0:F2}", d2); //convert to a formatted string
int _d = s1.IndexOf('.'); //find index of .
TimeSpan tis = new TimeSpan(0, Convert.ToInt16(s1.Substring(0, _d)), Convert.ToInt16(s1.Substring(_d + 1)), 0);

回答5:

Just provide the formats that you need.

var formats = new[] { "%h","h\\.m" };
var ts = TimeSpan.ParseExact(value, formats, CultureInfo.InvariantCulture);

Test to prove it works:

var values = new[] { "8", "8.3", "8.15" };
var formats = new[] { "%h","h\\.m" };

foreach (var value in values)
{
    var ts = TimeSpan.ParseExact(value, formats, CultureInfo.InvariantCulture);
    Debug.WriteLine(ts);
}

来源：https://stackoverflow.com/questions/17682099/convert-string-to-timespan

标签

parsing

timespan