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如何在插入块参照的同时给块赋一个扩展属性？
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如何在插入块参照的同时给块赋一个扩展属性？

我也是初学，我用vb.net,没有vc代码，我不会vc
自己的问题自己解决了！现代码改正如下：
public sub insertblockref(byval blockname as string, byval point as point3d, byval scale as scale3d, byval rotateangle as double, byval layername as string, byval xdatacode as string)
dim db as database = hostapplicationservices.workingdatabase
dim doclock as documentlock = autodesk.autocad.applicationservices.application.documentmanager.mdiactivedocument.lockdocument
dim bt as blocktable
using trans as transaction = db.transactionmanager.starttransaction
'以读的方式打开块表
bt = trans.getobject(db.blocktableid, openmode.forread)
'如果没有blockname表示的块，则程序返回
if (bt.has(blockname) = false) then
'从所指定的外部文件中导入块
importblocksfromdwg(blockname)
end if
'以读的方式打开blockname表示的块
dim block as blocktablerecord = trans.getobject(bt(blockname), openmode.forwrite)
'创建一个块参照并设置插入点
dim blockref as blockreference = new blockreference(point, bt(blockname))
blockref.scalefactors = scale '设置块参照的缩放比例
blockref.layer = layername '设置图层
blockref.rotation = rotateangle '设置块参照的旋转角度
'以写的方式打开当前空间（模型空间或图纸空间）
dim btr as blocktablerecord = trans.getobject(db.currentspaceid, openmode.forwrite)
btr.appendentity(blockref) '在当前空间加入创建的块参照
'通知事务处理加入创建的块参照
trans.addnewlycreateddbobject(blockref, true)
'给插入的块赋扩展属性
dim st as object = blockref
setxdata(st, xdatacode)
trans.commit() '提交事务处理以实现块参照的真实加入
trans.dispose()
end using
doclock.dispose()
end sub
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