Report Viewer Expression

问题

Basically, I want to check if the value of field F1 is not empty. If the row not empty then I want to calculate F2 * F3

The following expression always print

 #Error 
=IIf(Fields!f1 ="" ,"" ,Fields!f2.Value* Fields!If3.Value)

Please help

回答1:

You must use the Val function.

=IIF(IsNumeric(Fields!f2.Value) and IsNumeric(Fields!If3.Value),
     Val(Fields!f2.Value)*Val(Fields!If3.Value),
     Nothing
)

ReportViewer is a pain. IIf always evaluate 2 parts (true and false).

回答2:

Go and check the field expression. if you have something like: sum(fieldName) you must replace it with fieldName

回答3:

Maybe this will help You http://awebthatworks.wordpress.com/2010/04/29/reportviewer-expressions-which-use-data-fields-show-as-error/

来源：https://stackoverflow.com/questions/3087082/report-viewer-expression