This code comes from a videogame,i need to add various items of this type,but when i change locations in a new script duped,there is an existing key with same parameter,how can i change key value for each one?Thank you so much,Here is the important code from script:

`

protected Dictionary<Point3D, Map> ListOfLocations = new Dictionary<Point3D, Map>()
        {
            { new Point3D(1185, 1838, 0), Map.Felucca },
            { new Point3D(1215, 1809, 0), Map.Felucca },
            { new Point3D(1215, 1839, 0), Map.Felucca },
            { new Point3D(1214, 1839, 0), Map.Trammel },
        };
public Point3D GetRandomLocation()
        {
            return ListOfLocations.ElementAt(Utility.Random(0, ListOfLocations.Count)).Key;
        }

`

CodePudding user response：

If the Point3D is an object, not a struct, then modifying it wont change its reference value, which is used as an actual key in the dictionary in this case. Easiest way of changing a key in this case would be to remove key value pair and add a newly created one (newly created key and same value will work). For only changing the value it would not be necessary.

CodePudding user response：

Cannot insert same key in dictionary So I have written sample code that will help you.

what I got from your question is that Location is key of dictionary that is type of Point3D

            Point3D location = your location;
            if (!ListOfLocations.ContainsKey(location))
            {
                // then change in dictionary for location
            }
            else
            {
                 Map map = ListOfLocations[location];
                ListOfLocations.Remove(location);
               // then change in dictionary for location as per your requirement
               //for Example ListOfLocations.Add(location, newmap);
                
            }

Algo :-

1. check key exist in dictionary(that use hashtable in background)

   1.a if No then do needful.

   1.b else remove existing key from dictionary then do needful.