问题
I am developing a Report using ReportViewer with ASP.NET and C#. I'm binding data from a DataSource to a Tablix object using the .RDLC design view.
Inside this Tablix, there's a field that must me filled with one field from de datasource OR another one depending of an expression.
The expression in the field I am trying to use to achieve that is:
=IIf(IsNothing(Fields!PREMIO_CALCULADO_1.Value), Fields!PREMIO_CALCULADO_1.Value,Fields!RECUPERACAO_CALCULADA_INI_1.Value)
If the Field "PREMIO_CALCULADO_1" is null, then fill it with "RECUPERACAO_CALCULADA_INI". I'm not having compilation errors but when I execute the report where this value should be there is an #error tag.
Am I doing something wrong with that expression?
Thank you very much.
回答1:
It looks like you have the return values in the wrong position.
Just add a NOT before IsNothing.
来源：https://stackoverflow.com/questions/5104285/binding-data-on-reportviewer