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

and if you want to compare one property (id in this case), this should work

var list = new List();
list.AddRange(GetGreenCars().Where(greencar => !list.Contains(greencar, car => car.id == greencar.id)));
list.AddRange(GetBigCars().Where(bigcar => !list.Contains(bigcar, car => car.id == bigcar.id)));
list.AddRange(GetSmallCars().Where(smallcar => !list.Contains(smallcar, car => car.id == smallcar.id)));