The Rectangles property provides access to the list of AxisAlignedRectangles stored in a TileShapeCollection. This list will be ordered based on the TileShapeCollection's SortAxis property.
The following code shows how to loop through all rectangles in a TileShapeCollection and perform custom logic:
foreach(var rectnagle in SolidCollision.Rectangles)
{
// do something with the AxisAlignedRectangle here:
// ...
}