c# - What is the effective DataFormatString if none is used? -

using [displayformat(dataformatstring:="0,0.0")] attribute, can set dataformatstring or can leave off , display default data format data type.

what code use default? in code i'm formatting everything:

value = value.tostring(fieldmetadata.format); 

i need default format string fields have no attribute. want them behave if didn't set format. can't leave empty string because returns null in case.

this default date time format, depends on region.

"yyyymmdd hh.mm.ss"

i don't know if there way query system, if there way in culture settings. https://msdn.microsoft.com/en-us/library/system.globalization.cultureinfo(v=vs.110).aspx