sql server - ms SSRS 2008 R2: Display Computed Values #Error -

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the report display 2 columns foo , bar

some rows of foo empty have numerical value:

 foo: +----+ |    | +----+ |10.0| +----+

then there bar column, column take values foo , add 10 them, report should yield results this:

 foo: bar: +----+----+ |    |    | +----+----+ |10.0|20.0| +----+----+

thats expression use determine whether foo numeric inside bar:

=isnumeric(reportitems!foobox.value)

and result expression yield:

 foo: bar: +----+-----+ |    |false| +----+-----+ |10.0|true | +----+-----+

okay, thats way want far, write expression way:

=iif(isnumeric(reportitems!foobox.value),             reportitems!foobox.value +10,             "")

this yield following results:

foo: bar: +----+------+ |    |#error| +----+------+ |10.0|20.0  | +----+------+

and bizare, when remove little addition in truepart of iif, execute: 

=iif(isnumeric(reportitems!foobox.value),                 reportitems!foobox.value,                 "")  foo:   bar: +----+------+ |    |      | +----+------+ |10.0|10.0  | +----+------+

it's if "wrong" part of ternary operator gets executed anyway, generating casterror or whatever might be.

how can convert values in order show results explained before?

indeed - using iif cause both statements (true , false) evaulated , leads error getting.

being in situation, create own function handle - can place in code field of report (click outside of page area access report object)

your function might this:

public function myadd(val object) nullable(of integer)         if typeof(val) integer              return val + 10         else              return nothing         end if end function

you might need play types used (object , nullable of integer maybe not work you)

then, of course, use myadd in expression , pass reportitems!foobox.value parameter


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