使用表达式基于参数值（SSRS）显示或隐藏矩形

Question

Trying to show/hide a couple of rectangles in SSRS based on an expression which uses the value of a parameter in the report. See the screenshots for more details. When the '-Cover pages' label is picked I want it to display the rectangle but I consistently get the following errors. It can't seem to convert and read the parameter expression no matter what I do.

The expression I'm trying to use is:

=iif(Parameters!specparam.Value="-Cover Pages",true,false)

Answer 1

It looks like the label of your parameter is what you're looking for based on the image provided and your expression. Try to switch instead to:

=IIF(Parameters!specparam.Label="-Cover Pages",TRUE,FALSE)

(Note: I switched specparam.Value to specparam.Label .

Answer 2

Your comment is very close. Apply this expression to the Hidden property of the rectangle:

=IIF( Parameters!specparam.Label.Equals("-Cover Pages"), FALSE, TRUE )

You'll notice I have switched around the FALSE and TRUE as you don't want the rectangle to hide when the parameter matches.

Edit: As you're dealing with a multivalue parameter, you can use a combination of Array.IndexOf and Split to check if your value is one of the selected parameters. Apply this expression to the Hidden property of your rectangle:

=IIF( Array.IndexOf( Split( Parameters!specparam.Value, "," ), "-Cover Pages" ) > -1, FALSE, TRUE )