将图元包含的点集合(IPointCollection)序列化为二进制保存到数据库

需求：

把图元包含的点集合按

 

点数

x1

y1

x2

y2

...

...

 

这样保存到byte[]数组中并存储到数据库(oracle的blob或sqlserver的image型)

 

IFeature ftrftr=......IGeometry boundGeometry = ftr.Shape; IPointCollection pointCollection = boundGeometry as IPointCollection;int ptCount = pointCollection.PointCount;byte[] bytePts = new byte[ptCount * 16+4];//blob前4位保存点数，后面保存点坐标 byte[] byteptCount = System.BitConverter.GetBytes(ptCount); int lbc = byteptCount.Length; byteptCount.CopyTo(bytePts, 0); for (int i = 0; i < ptCount; i++) { byte[] bytept = System.BitConverter.GetBytes(pointCollection.get_Point(i).X); bytept.CopyTo(bytePts,4+i*16); bytept = System.BitConverter.GetBytes(pointCollection.get_Point(i).Y); bytept.CopyTo(bytePts, 4 + i * 16+8); } 

 

开始是用string连接多个点坐标，用逗号分隔，然后转成byte数组，但这样的话，

byte数组就凭空大了一倍

在读取的时候还要转换类型，再分解，使用C++做这些操作比较麻烦(客户端是C++写的)

这样存储按位读取，速度效率都不错，记一下