IPointCollection的RemovePoints属性为什么有时会出现The index was either too large or too small.且点的索引没有超出点集个数这是什么问题，求助各位大神！！
http://zhidao.baidu.com/link?url=oT9Qz2RX9Zx2nPGs48b1Z1R_gpmzy5QhEdm1Vjhgj9CxYqZSrSsK6u6wcoHoSi0kWepk-CaPC4v4W8OJGfI1DjvtlWKtxaALf8a6doHyDWe
删除点后，要重新计算pointcollection中的索引