(获取实体ID集合时)过滤器的使用及检测（过滤器引用）对象的类型名称
1.过滤器常用操作符组合（1）a或b
操作符："<OR" "a" "b" "OR>"
例集合包含 多断线（对像类型名称为LWPOLYLINE） 或 块参照（对像类型名称为INSERT）
TypedValue[] ftv = new TypedValue[]
{
new TypedValue((int)DxfCode.Operator , "<OR"),
new TypedValue((int)DxfCode.Start, "LWPOLYLINE") ,
new TypedValue((int)DxfCode.Start, "INSERT"),
new TypedValue((int)DxfCode.Operator , "OR>")
};
SelectionFilterxfilter= new SelectionFilter(ftv);
(2) a和b
操作符："<AND" "a" "b" "AND>"
例： 在“ping"层的直线。（是直线并且所在层名称为“ping“）
TypedValue[] ftv = new TypedValue[]
{
new TypedValue((int)DxfCode.Operator , "<AND"),
new TypedValue((int)DxfCode.Start, "LINE") ,
new TypedValue((int)DxfCode.LayerName, "ping"),
new TypedValue((int)DxfCode.Operator , "AND>")
};
SelectionFilterxfilter= new SelectionFilter(ftv);
（3）其它如 （A和B）或者（C和D）的，模式为：
"<OR"
"<AND"
“ A”
“ B ”
"AND>"
"<AND"
“ C”
“ D ”
"AND>"
"OR>"
2.在使用过滤器过滤指定对象时，需要设置对象类型名称，如参照块“INSERT”，多段线“LWPOLYLINE”
不知DXFNAME时可以如下做测试来获取
public void getentsdxfanme()
{
using (DocumentLock docLock = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.LockDocument())
{
ObjectId obt = GetSelectFirstEntityid();
if (!obt.IsNull)
{
Database db = HostApplicationServices.WorkingDatabase;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
Entity ent = (Entity)trans.GetObject(obt , OpenMode.ForWrite);
ed.WriteMessage(ent.GetRXClass().DxfName .ToString () );
trans.Commit();
}
}
}
}
public static ObjectId GetSelectFirstEntityid() //通过鼠标获取单个实体ID
{
using (DocumentLock docLock = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.LockDocument())
{
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
Database db = HostApplicationServices.WorkingDatabase;
ObjectId o1 = new ObjectId();
PromptSelectionOptions selectionOp = new PromptSelectionOptions();
PromptSelectionResult ssRes = ed.GetSelection(selectionOp);
if (ssRes.Status == PromptStatus.OK)
{
o1 = ssRes.Value.ObjectId;
}
return o1;
}
}
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