Merge two List<object> into one List in Linq

Question

I have two lists. BeamElevations<Elevation> and FloorElevations<Elevation>. How can I merge these into Elevations<Elevation> list and order them based on their Elevation using Linq?

Answer 1

Use Concat and OrderBy

var result = list1.Concat(list2).OrderBy(x => x.Elevation).ToList();

If you want to remove duplicates and get an unique set of elements you can also use Union method:

var result = list1.Union(list2).OrderBy(x => x.Elevation).ToList();

In order to make it work properly you need to overide Equals and GetHashCode methods in your class.