SSRS expression for hiding/showing text boxes

Question

I have created an SSRS report.

In this report I have created a dataset called: DataSet1. DataSet1 contains two columns: EntityId (integer) and Name (Varchar). I would like to show a textbox if one of the values in the EntityId column is "27".

So I want to write an expression that does this:

If one of the rows in DataSet1 has a EntityId value of 27, then show the textbox, else hide the textbox.

From reading some other similar questions, I think counting the rows is probably the way to go. So instead it might be something like:

Count the rows where DataSet1.EntityId = 27. If the number of rows is more than 0 then show the SSRS textbox, else hide the textbox.

Any help with the expression would be much appreciated

Answer 1

You can do this easily with a simple expression.

Set the hidden property of the textbox to

=SUM(IIF(Fields!EntityID.Value = 27,1,0), "DataSet1") = 0

All we are doing here is, starting from the inner expression...

1. Check if EntityID = 27, if it does return 1 else return 0.
2. Do this for each instance within the scope "DataSet1" (your entire dataset)
3. Sum the results
4. Test if the result is zero

This will return True if the result is zero (no rows = 27) and therefore hide the textbox

Note: the dataset name must be enclosed in quotes and is case sensitive.

Answer 2

In order to keep the expression simple, I would suggest to add the corresponding flag directly to the DataSet. Following an example:

DECLARE @t TABLE(
  EntityID int
 ,Title nvarchar(10)
)

INSERT INTO @t VALUES
(10, 'Test 1')
,(27, 'Test 2')
,(27, 'Test 3')
,(11, 'Test 4')
,(15, 'Test 5')
,(15, 'Test 6')
,(27, 'Test 7')

SELECT *, COUNT(CASE WHEN EntityID = 27 THEN 1 ELSE NULL END) OVER (ORDER BY (SELECT 1)) AS flag
  FROM @t

The column flag is 0 if no EntityID 27 is found and > 0 if this ID is found, so your expression would be something like if flag > 0 then... .