Use DisplayFormat in Asp.Net Core to display elapsed time

Question

I have a ViewModel class with a column, named Duration that contains the amount of hours between two DatetTime columns (calculated in the query):

public Int32 Duration { get; set; }

I was hoping that I could use an annotation to display the amount of elapsed time, in days and hours (e.g. 0d 15h).

This doesn't work:

[DisplayFormat(DataFormatString = "{0:dd hh}")]

The logic using a TimeSpan:

DateTime s;
DateTime.TryParse("2015-03-18 15:00:42.920",out s);
DateTime e;
DateTime.TryParse("2015-03-19 06:52:44.440",out e);
TimeSpan t = e - s;
Console.WriteLine(String.Format("{0}d {1}h", t.Days, t.Hours));

Is there a way to use data annotations (alone) to achieve this?

Answer 1

I decide to add a function to the view:

public string Elapsed(Int32 duration)
{
    TimeSpan t = TimeSpan.FromHours(duration);
    return String.Format("{0}d {1}h", t.Days, t.Hours);
}

then reference it:

<td> @Elapsed(item.Duration) </td>