#RTCNA wish 10 granted! Material replacement

Amy asked if the API can be used to find and replace materials

This implementation does that for wall types and could be extended for other objects where the material is stored in a different manner.

BEFORE

 before

AFTER

after


public void replaceMaterials()
{
    Document doc = this.ActiveUIDocument.Document;
    
    List<Tuple<string,string>> replacements = new List<Tuple<string, string>>();
    // old materal listed first, then new material that will replace it
    replacements.Add(new Tuple<string, string>("Brick, Common", "Brick, Orange"));
    replacements.Add(new Tuple<string, string>("Concrete Masonry Units", "Cherry"));

    using (Transaction t = new Transaction(doc, "Replace Materials"))
    {
        t.Start();
        foreach (WallType wt in new FilteredElementCollector(doc).OfClass(typeof(WallType)).Cast<WallType>())
        {
            CompoundStructure cs = wt.GetCompoundStructure();
            if (cs == null)
                continue;

            int idx = 0;
            foreach (CompoundStructureLayer layer in cs.GetLayers())
            {
                foreach (Tuple<string, string> tup in replacements)
                {
                    Element oldMaterial = new FilteredElementCollector(doc).OfClass(typeof(Material))
                        .FirstOrDefault(q => q.Name == tup.Item1);
                    Element newMaterial =  new FilteredElementCollector(doc).OfClass(typeof(Material))
                        .FirstOrDefault(q => q.Name == tup.Item2);
                    
                    if (layer.MaterialId == oldMaterial.Id)
                        cs.SetMaterialId(idx, newMaterial.Id);
                }
                idx++;
            }
            wt.SetCompoundStructure(cs);
        }
        t.Commit();
    }
}
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