快速设置Revit模型材质（Dynamo和API）

void ChangeElementMaterial( Document doc, ElementId id )
  {
    Element e = doc.GetElement( id );
    if( null != e.Category )
    {
      int im = e.Category.Material.Id.IntegerValue;
      List<Material> materials = new List<Material>(
        new FilteredElementCollector( doc )
          .WhereElementIsNotElementType()
          .OfClass( typeof( Material ) )
          .ToElements()
          .Where<Element>( m 
            => m.Id.IntegerValue != im )
          .Cast<Material>() );
      Random r = new Random();
      int i = r.Next( materials.Count );
      using( Transaction tx = new Transaction( doc ) )
      {
        tx.Start( "Change Element Material" );
        e.Category.Material = materials[ i ];
        tx.Commit();
      }
    }
  }