topic Re: set family symbol combobox parameter in Revit API Forum

set family symbol combobox parameter

Yonas89 — Fri, 24 Aug 2018 13:36:47 GMT

Hello I am trying to set a value for package structure parameter which kind of has combo box option.

In normal case I use the snippet below to set the value and it works fine, but not in this case.

// transaction is used where this method is called, so this is not a transaction problem
private void SetParams(FamilySymbol fs)
{
 IList<Parameter> pars = fs.GetOrderedParameters();
 foreach(Parameter p in pars)
 {
  if (p.Definition.Name == "Package Structure")
  {
    p.Set("value");
    break;
  }
 }
}

Re: set family symbol combobox parameter

jeremytammik — Fri, 24 Aug 2018 18:51:10 GMT

Dear Yonas89,

Thank you for your query.

The Revit API provides support for parameter data via the Parameter class:

https://apidocs.co/apps/revit/2019/333ff41b-e6a7-d959-60bf-c3bfae495581.htm

It supports the data types listed by the StorageType enumeration:

https://apidocs.co/apps/revit/2019/9315853a-9210-6111-acba-8bd53913eec2.htm

https://apidocs.co/apps/revit/2019/3dbebcb8-792b-a3dd-fe63-faaa05704f3c.htm

Unfortunately, some parameters are equipped internally with data that does not fit into any of the API accessible storage types.

In such cases, the parameter data cannot be accessed via the API, neither for read nor write.

From the screen snapshot of the combo box that you share, it looks as if the parameter you are interested in falls into this category and therefore cannot be modified programmatically.

I hope this helps.

Sorry for the bad news.

Best regards,

Jeremy

Re: set family symbol combobox parameter

Yonas89 — Sat, 25 Aug 2018 13:09:48 GMT

@jeremytammik,

thanks a lot for your reply! , though I cannot open your links (I don't know why, I end up at the blank page), I kind of think that you rea 100% right and I cannot modify this type of parameter. it's a pity.

Re: set family symbol combobox parameter

jeremytammik — Sat, 25 Aug 2018 14:37:27 GMT

Yes. a pity. That's the way it is.

Weird with the links, they open just fine for me.

No matter, they just lead to the Revit API documentation...

Cheers,

Jeremy

Re: set family symbol combobox parameter

Yonas89 — Tue, 28 Aug 2018 05:57:50 GMT

@jeremytammik,

I have decided to come back to this problem and most surprisingly actually I don't know what I have done differently from my snippet ( as I remember I did nothing) but now it works! So, it means this is possible. just a simple method: Parameter.Set("anything");

Re: set family symbol combobox parameter

jeremytammik — Tue, 28 Aug 2018 06:48:31 GMT

Glad to hear you have it working now!