Set material parameter programmatically.

[mohd.fadel]

Hello,

I'm trying to set the custom parameter of a material programmatically. This is my code so far:

foreach (ElementId materialId in f.GetMaterialIds(false))
            {
                Material material = f.Document.GetElement(materialId) as Material;
                Element el = doc.GetElement(elemId);
                ParameterSet parameters = el.Parameters;
                foreach (Parameter param in parameters)
                {
                    if (param.Definition.Name == "USER_DEFINED_FIELD")
                    {
                        switch (param.StorageType)
                        {
                            case Autodesk.Revit.DB.StorageType.String:

                                if (String.IsNullOrWhiteSpace(param.AsString()))
                                {
                                        param.Set("Hello");
                                        param.SetValueString("Hello");
                                }
                                break;
                            default:
                                break;
                        }
                    }
                }        
            }

Furthermore, I have this code wrapped in a transaction. However, nothing is happening. Any ideas?

Any help is appreciated.

M.Fadel 

[mohd.fadel]

Sorry correction,

The

Material material = f.Document.GetElement(materialId) as Material;

 line is for when i tried implementing Jeremy's post [http://thebuildingcoder.typepad.com/blog/2013/01/read-material-asset-parameter.html]

However, i didn't know what to do here:

PropertySetElement property = doc.GetElement(
    material.StructuralAssetId ) as PropertySetElement;
 
  Parameter paramTensionParallel
    = property.get_Parameter( BuiltInParameter
      .PHY_MATERIAL_PARAM_TENSION_PARALLEL );

Is the first method not valid (without the initialization of a Material variable)?

M.Fadel

[mohd.fadel · Accepted solution]

Update:

I was able to figure out the issue. It was:

foreach (ElementId materialId in f.GetMaterialIds(false))

that was causing the issue.

I just used a regular FilteredElementCollector instead of a FamilyInstanceCollector and iterated through that collection's elements.

Thank you.

M.Fadel