c# - How to convert nullable DateTime? -

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string fc = ....... dictionary<string, string> fcdata = serializer.deserialize<dictionary<string, string>>(fc);   if (!string.isnullorwhitespace(fcdata["diploma.graduationbegindate"]))   datetime? graduationbegindate = convert.todatetime(fcdata["diploma.graduationbegindate"]);

error : {"object reference not set instance of object."}

this code . fcdata has value, count =11 , fcdata["diploma.graduationbegindate"] value 10.05.2016 why doesn't work ? me ?

you can affect datetime datetime? :

datetime t1 = somedate; datetime? t2; t2 = t1; <- works

in contrary :

datetime? t1 = somedate; datetime t2; t2 = t1; <- won't work, need cast t2 = (datetime)t1;

hope help.


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