i get data from xml file and sometime the date is empty.
i have this code:
try { TimeTo = Convert.ToDateTime(R[15].ToString()); }
catch { TimeTo = null ; }
but i got error because i cant insert null to datetime var
what i can do ?
thak's in advance
Make TimeTo a nullable property like this:
public DateTime? TimeTo { get; set; }
A better solution than the try/catch is to do something like this:
TimeTo = string.IsNullOrEmpty(R[15].ToString())
? (DateTime?) null
: DateTime.Parse(R[15].ToString());
DateTime is a value type and therefore cannot be assigned null. But...
DateTime.MinValue is a nice replacement for that to help point out to the lack of value.
try { TimeTo = Convert.ToDateTime(R[15].ToString()); }
catch { TimeTo = DateTime.MinValue; }
Another option is to make use of nullable types:
DateTime? TimeTo = null;
And reference it like this:
if (TimeTo.HasValue)
something = TimeTo.Value;
TimeTo ?? defaultTimeTo, resolving to the latter if the former is null.?? is the null coalescing operator, in C#.on a slight tangent, if you are expecting that R[15] may not be a datetime I would suggest TryParse is a better option
if(DateTime.TryParse(R[15].ToString(),out TimeTo))
{
//TimeTo is set to the R[15] date do stuff you need to if it is good
}
else
{
//TimeTo is default (i.e. DateTime.MinValue) do stuff for a bad conversion (e.g. log, raise exception etc)
}
