merge Point3DCollection

我有这样的代码:

public Point3DCollection generatePoints()
{
     //generate some Point3D, add them to a Point3DCollection and return it.
     ....
}
//in the main function
Point3DCollection allPoints=new Point3DCollection();
while(...){
   //i need to merge the result from generatePoints() with allPoints, like this:
  allPoints.merge(this.generatePoints());
}

我希望merge()方法是有效的(即不使用for循环或逐个添加元素)。我知道有一个addRange()通用列表，但它不可用于Point3DCollections。任何建议吗?