public enum Object3DRenderingMode : System.Enum, System.IComparable, System.IConvertible, System.IFormattable, System.ISpanFormattable  

{
  // Note: call within QueuedTask.Run()
  {
    //Note: wire_frame_filters can be null in this example
    var wire_frame_filters = bsl.GetFilters().Where(
      f => f.FilterBlockDefinitions.Any(
        fb => fb.FilterBlockMode == Object3DRenderingMode.Wireframe));
    //substitute Object3DRenderingMode.None to get blocks with a solid mode (default)
    //and...
    //fb.FilterBlockMode == Object3DRenderingMode.Wireframe &&
    //fb.FilterBlockMode == Object3DRenderingMode.None
    //for blocks with both
  }
}

{
  // Note: call within QueuedTask.Run()
  {
    var filterBlock = new FilterBlockDefinition();
    filterBlock.FilterBlockMode = Object3DRenderingMode.Wireframe;

    var selectedValues = new Dictionary<string, List<string>>();
    //We assume QueryAvailableFieldsAndValues() contains "Walls" and "Doors"
    //For 'Category'
    selectedValues["Category"] = new List<string>() { "Walls", "Doors" };
    filterBlock.SelectedValues = selectedValues;

    //Overwrite
    filter.FilterBlockDefinitions = new List<FilterBlockDefinition>() { filterBlock };
    bsl.UpdateFilter(filter);
  }
}