How to check if SSRS Textbox is empty

问题

How do you check if a textbox is empty in SSRS 2008? I've tried this code and it doesn't work.

IIF(ReportItems!txtCountVolunter.Value = "", false, true)

回答1:

Try the following:

=IIF(Len(ReportItems!txtCountVolunteer.Value) <= 0, true, false) 

回答2:

You should use this expression

=IIF(IsNothing(Fields!UserEmail.Value) OR Fields!UserEmail.Value = "",
 "Empty", "Not Empty")

The first: IsNothing(Fields!UserEmail.Value) checks if the field value is NULL The second: Fields!UserEmail.Value = "" checks of the filed value is blank ""

So you need both of them in order to check if the value is either null or empty.

回答3:

Try the IsNothing function like this:

IIF(IsNothing(ReportItems!txtCountVolunter.Value), "empty", "not empty")

回答4:

Check for null

=IIF(IsNothing(ReportItems!txtCountVolunteer.Value),true, false) 

回答5:

For those who come from a .NET world and you want to check non-empty and say for argument sake want the value 0 instead of blank!

=IIf(String.IsNullOrEmpty(ReportItems!txtCountVolunteer.Value), 0, ReportItems!txtCountVolunteer.Value)

来源：https://stackoverflow.com/questions/12738569/how-to-check-if-ssrs-textbox-is-empty