Revit二次开发之获得项目族预览图

 

using Autodesk.Revit.UI; using Autodesk.Revit.DB; using Autodesk.Revit.Attributes; using System.Windows.Media.Imaging; using Autodesk.Revit.UI.Selection;   namespace HelloWorld {     [Transaction(TransactionMode.Manual)]     [Regeneration(RegenerationOption.Manual)]     public class Test : IExternalCommand     {         public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)         {             UIDocument uidoc = commandData.Application.ActiveUIDocument;             Document doc = uidoc.Document;             Reference refer = uidoc.Selection.PickObject(ObjectType.Element,new Filter(), "拾取目标构件");               FamilyInstance instance = doc.GetElement(refer) as FamilyInstance;             FamilySymbol symbol = instance.Symbol;               //可以将image保存或是传递给PictreBox             System.Drawing.Image image = symbol.GetPreviewImage(new System.Drawing.Size(100,100));                          return Result.Succeeded;         }     }     //过滤器     public class Filter : ISelectionFilter     {         public bool AllowElement(Element elem)         {             return elem.Category.Name == "管道附件" & elem.Name == "钢管_沟槽_同径90度弯头_DN25-600";         }           public bool AllowReference(Reference reference, XYZ position)         {             return false;         }     }   }