问题
I'm trying to format some cells in a Reporting Services report that will contain DateTime? values - or not.
If the underlying data has a NULL for that DateTime?, I'd like to show nothing (empty cell) - and if that data source contains a value, I'd like to show the date in short date format (dd.MM.yyyy in my locale).
So I tried to put this formula into the relevant SSRS cells
=FormatDateTime(Fields!DatumBSE.Value, 2)
but now I'm getting 01.01.0001 for all NULL dates....
I can't seem to wrap my head around how to do this in a SSRS (VB) formula.... I tried using IsNothing() but that doesn't seems to really help - I can detect a NULL, but how to I tell the cell to show an empty string in that case?
Solution:
I ended up using this function:
=IIF(IsNothing(Fields!DatumBSE.Value), "", FormatDateTime(Fields!DatumBSE.Value, 2))
Seems to work just fine for me now.
回答1:
I just tested the following expression and it replaced the null date with an empty string:
=IIF(Fields!DatumBSE.Value is nothing, nothing, FormatDateTime(Fields!DatumBSE.Value, 2))
The other suggestion that I would make is that you could format the date to the correct format in the report dataset by placing a CASE expression around the date value.
回答2:
use a code like this:
If(isNull([date field]),Null, elsequote)
来源：https://stackoverflow.com/questions/14606390/detecting-null-dates-and-showing-empty-string-in-ssrs