What you can do with View Filters in the 2014 API

Here’s are the new Filter items for the View class in 2014:

• AddFilter – The filter will be added with default overrides, so there will be no change in the view’s display.
• GetFilterOverrides – Returns all graphic overrides of a specific filter in the view
• GetFilters – Returns the ids of the filters applied to the view
• GetFilterVisibility – Returns true if the elements associated with a specific filter are visible in the view
• IsFilterApplied – Returns true if a specific filter is applied to the view
• RemoveFilter
• SetFilterOverrides – Set the OverrideGraphicSettings for a filter in a view. Adds the filter to the view if it hadn’t been previously added.
• SetFilterVisibility – Set the visibility of a specific filter (true / false) for a view. Adds the filter to the view if it hadn’t been previously added.

public void Filter2014Sample()
{
    UIDocument uidoc = this.ActiveUIDocument;
    Document doc = uidoc.Document;
    View view = doc.ActiveView;

    TaskDialog.Show("Boost Your BIM","# of filters applied to this view = " + view.GetFilters().Count);

    // create list of categories that will for the filter
    IList<ElementId> categories = new List<ElementId>();
    categories.Add(new ElementId(BuiltInCategory.OST_Walls));

    // create a list of rules for the filter
    IList<FilterRule> rules = new List<FilterRule>();
    // This filter will have a single rule that the wall type width must be less than 1/2 foot
    Parameter wallWidth = new FilteredElementCollector(doc).OfClass(typeof(WallType)).FirstElement().get_Parameter(BuiltInParameter.WALL_ATTR_WIDTH_PARAM);
    rules.Add(ParameterFilterRuleFactory.CreateLessRule(wallWidth.Id, 0.5, 0.001));

    ParameterFilterElement filter = null;
    using (Transaction t = new Transaction(doc, "Create and Apply Filter"))
    {
        t.Start();
        filter =  ParameterFilterElement.Create(doc, "Thin Wall Filter", categories, rules);
        view.AddFilter(filter.Id);
        t.Commit();
    }

    string filterNames = "";
    foreach (ElementId id in view.GetFilters())
    {
        filterNames += doc.GetElement(id).Name + "\n";
    }
    TaskDialog.Show("Boost Your BIM","Filters applied to this view: " + filterNames);

    // Create a new OverrideGraphicSettings object and specify cut line color and cut line weight
    OverrideGraphicSettings ogs = new OverrideGraphicSettings();
    ogs.SetCutLineColor(new Color(255,0,0));
    ogs.SetCutLineWeight(9);

    using (Transaction t = new Transaction(doc, "Set Override Appearance"))
    {
        t.Start();
        view.SetFilterOverrides(filter.Id,ogs);
        t.Commit();
    }
}