public override string ToString()
{
var str = string.Format("Edge {2} [{0} - {1}]: ", p1_ID, p2_ID, GetHashCode());
if (Faces == null)
{
str += "has no faces";
}
else
{
foreach (var face in Faces)
{
str += face.ToString();
if (face != Faces.Last <int>())
{
str += ", ";
}
}
}
return(str);
}