BlockPreview -

程序代码：


[CommandMethod("BlockPreview")]
         public void GenerateBlockPreview()
         {
             Database db = HostApplicationServices.WorkingDatabase;
 
             Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
 
             PromptFileNameResult result = ed.GetFileNameForOpen("请选择需要预览的文件");
 
            if (result.Status != PromptStatus.OK) return;
 
             string filename = result.StringResult;
             //在C盘跟目录线，创建一个临时文件夹，用于存放文件中的块预览图标
             string path = "C:\\Temp1";
             if (!Directory.Exists(path))
                 Directory.CreateDirectory(path);
 
             using (Transaction tran = db.TransactionManager.StartTransaction())
             {
                 //导入外部的块
                 db.ImportBlocksFrmDwg(filename);
 
                 //打开块表
                 BlockTable bt = tran.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
 
                 foreach (ObjectId id in bt)
                 {
                     BlockTableRecord btr = tran.GetObject(id, OpenMode.ForRead) as BlockTableRecord;
 
                     //如果是匿名块，布局块以及没有预览图型块，则返回
                     if (btr.IsAnonymous || btr.IsLayout || !btr.HasPreviewIcon)
                     {
                         //获取预览图块，适用于2008及以下版本
                         Bitmap preview = BlockThumbnailHelper.GetBlockThumbanail(btr.ObjectId);
                         //
                         //Bitmap preview = btr.PreviewIcon;//适用于2009版本及以上版本
 
                         preview.Save(path + "\\" + btr.Name + ".bmp");//保存块预览
                     }
 
                 }
                 tran.Commit();
 
             }
 
         }