topic Re: Parameter in Revit API Forum

Parameter

Anonymous — Thu, 01 Sep 2016 12:43:52 GMT

Hi,

I have a problem to migrate an old dll to 2016 / 2017.

The problem is on this line:

Dim Sh_Data1 As Parameter = csheet.Parameter("Data")

Data is a shared parameter, on Revit 2015 work correctly, on Revit 2017 I receive this error:

Not valid CAST from "Data" string to Integer type

How I can solve it?

Re: Parameter

Mustafa.Salaheldin — Thu, 01 Sep 2016 13:39:27 GMT

Please try the Element.GetParameters Method instead.

Re: Parameter

Anonymous — Thu, 01 Sep 2016 13:59:21 GMT

HI,

tahnks

can you make me a sample?

Re: Parameter

Anonymous — Thu, 01 Sep 2016 16:00:31 GMT

Dim Sh_Data1 As IList(Of Parameter) = csheet.GetParameters("Data")

Re: Parameter

Anonymous — Fri, 02 Sep 2016 08:26:02 GMT

HI,

Thanks, now work correctly, but When I use it on the current sheet, Sh_Data1 contains 2 items with the some value, why?

Re: Parameter

Mustafa.Salaheldin — Sat, 03 Sep 2016 04:26:41 GMT

This is so natural. Please read the following quote from the API guide:

"Multiple matches of parameters with the same name can occur because shared parameters or project parameters can be bound to an element category even if there is a built-in parameter with the same name already.

If this method is used to find built-in parameters the code will not be portable to other languages of Revit (because built-in parameter names are translated, and this method matches the translation).

For the reasons above this method should be used sparingly and when portability across multiple languages is not a requirement.

Safer approaches include:

get_Parameter(Guid) to get a shared parameter by stored guid.
get_Parameter(BuiltInParameter) to find a built-in parameter in a language-independent way."