Is there an AddUnique method similar to Addrange() for alist in C#

Question

I have a list in C#:

       var list = new List();
       list.AddRange(GetGreenCars());
       list.AddRange(GetBigCars());
       list.AddRange(         


        

Answer 1

Given you override the .Equals() method for Car to determine one car object is the same as another car object, then the following should work w/o writing an extension method.

    var list = new List();
    list.AddRange(GetGreenCars()?.Except(list) ?? new List());
    list.AddRange(GetBigCars()?.Except(list) ?? new List());
    list.AddRange(GetSmallCars()?.Except(list) ?? new List());