CAD读取属性块

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MxDrawUtility mxUtility = new MxDrawUtility();                   MxDrawPoint getPt;                 MxDrawEntity ent = mxUtility.GetEntity(out getPt, "\n 选择块引用实体:");                 if (ent == null)                 {                     return;                 }                   if (ent is MxDrawBlockReference)                 {                     MxDrawBlockReference blkRef = (MxDrawBlockReference)ent;                     // 读取块名。                       mxUtility.Prompt("\n Name" +  blkRef.GetBlockName());                       for (int j = 0; j < blkRef.AttributeCount; j++)                     {                         MxDrawAttribute attrib = blkRef.AttributeItem(j);                         mxUtility.Prompt("\n Tag: " + attrib.Tag + "  Text:" + attrib.TextString                                                           );                     }                       // 从块记录中，得到提示文字.                     MxDrawBlockTableRecord blkRec = blkRef.BlockTableRecord;                       MxDrawBlockTableRecordIterator iter = blkRec.NewIterator();                       for (; !iter.Done(); iter.Step(true, false))                     {                         MxDrawEntity tmpEnt = iter.GetEntity();                           if (tmpEnt is MxDrawAttributeDefinition)                         {                             MxDrawAttributeDefinition attribDef = (MxDrawAttributeDefinition)(tmpEnt);                               mxUtility.Prompt("\n Tag: " + attribDef.Tag + " Tip:" + attribDef.Prompt                                                        );                           }                       }                       }                 else                 {                     MessageBox.Show("选择块引用实体");                 }