//添加实体对象集
private void addGeometryCollectionToolStripMenuItem_Click(object sender, EventArgs e)
{
IGeometryCollection geometryCollection1 = new MultipointClass();
IGeometryCollection geometryCollection2 = new MultipointClass();
IMultipoint multipoint;
object missing = Type.Missing;
IPoint point;
for (int i = 0; i < 10; i++)
{
point = new PointClass();
point.PutCoords(i * 2, i * 2);
geometryCollection1.AddGeometry(point as IGeometry, ref missing, ref missing);
}
geometryCollection2.AddGeometryCollection(geometryCollection1);
multipoint = geometryCollection2 as IMultipoint;
addFeature("multipoint", multipoint as IGeometry);
this.axMapControl1.Extent = multipoint.Envelope;
this.axMapControl1.Refresh();
}