ArcGIS Pro二次开发获得符号库的符号

  string customStyleToAdd = @"F:2020book	oolforproMyProject3ed-fh.stylx";
            //AsyncMethod(customStyleToAdd);


            StyleProjectItem style = Project.Current.GetItems<StyleProjectItem>().First(x => x.Path == customStyleToAdd);
            IList<SymbolStyleItem> PolygonSymbol = null;
            Task ptask = QueuedTask.Run(() =>
               {
                   PolygonSymbol = style.SearchSymbols(StyleItemType.PolygonSymbol, "");
               });
            ptask.Wait();
            foreach (SymbolStyleItem pSymbol in PolygonSymbol)
            {
                MessageBox.Show(pSymbol.Name);

            }