AutoCAD .Net 通过块参照获取块名

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通过块参照获取块名，需要区分是不是动态块。
示例代码如下：

[CommandMethod("GetBlockName")]public void GetBlockName(){    Document doc = Application.DocumentManager.MdiActiveDocument;    Database db = doc.Database;    PromptEntityOptions options = new PromptEntityOptions("\nSelect block reference");    options.SetRejectMessage("\nSelect only block reference");    options.AddAllowedClass(typeof(BlockReference), false);    PromptEntityResult ret = doc.Editor.GetEntity(options);    if (ret.Status != PromptStatus.OK)        return;    using (Transaction tr = db.TransactionManager.StartTransaction())    {        BlockReference blkRef = tr.GetObject(ret.ObjectId,            OpenMode.ForRead) as BlockReference;        ObjectId blkRecdId = ObjectId.Null;        if (blkRef.IsDynamicBlock)        {            blkRecdId = blkRef.DynamicBlockTableRecord;        }        else        {            blkRecdId = blkRef.BlockTableRecord;        }        BlockTableRecord block = tr.GetObject(blkRecdId,            OpenMode.ForRead) as BlockTableRecord;        doc.Editor.WriteMessage(block.Name + "\n");    }}

参考文章：
http://adndevblog.typepad.com/autocad/2012/05/identifying-block-name-from-the-block-reference.html

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