Values at start of span with negative direction and end of span with positive direction is not inside span, while values at start of span with positive direction and end of span with negative direction is considered inside span.
Values inside other spans can share start/end chainage without being inside.
public bool ContainsValue(
double startChainage,
double endChainage
)[Missing <returns> documentation for "M:DHI.Mike1D.Generic.NetworkReachDataSet`1.ContainsValue(System.Double,System.Double)"]