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Question by ItzChris92 · Aug 03, 2017 at 06:45 PM · c#listsfilterlinq

Filter list items and display them

Hi, I currently have a list of inventory items and would like some advice on the best way to filter them and display the item Sprites accordingly.

What I had in mind was clearing the list when a button is pressed (weapons for example) and then re-initializing the list with all items of type weapon. Is there a better way? Maybe using linq? Not used linq much before so if that is a better way can anyone advise how to do this please?

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Answer by UnityCoach · Aug 03, 2017 at 07:07 PM

Linq is probably your best option yes.

Say you have a ScriptableObject, or any other class you want to build a list of

 public class Item
 {
     public enum TYPE {Weapon, Health, ExtraLife}
 
     public string name;
     public int value;
     public TYPE type;
 }

You can use Linq to filter it, like

 List<Item> items = new List<Item>();
 
 public List<Item> Filter (Item.TYPE type)
 {
     List<Item> displayList = (from item in items
         where item.type == type
         select item).ToList();
     return displayList;
 }
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avatar image ItzChris92 · Aug 04, 2017 at 03:44 PM 0
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Thank you. I've managed to create a filter myself since asking this question but what you suggest seems much better! Currently I'm removing all instantiated gameobjects, looping through the list again and finding all objects that match a type selected via a drop down and reinstantiating them. I'll play around with what you suggest and see which works better

avatar image UnityCoach · Aug 04, 2017 at 03:54 PM 0
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You can also sort the end result, using something like :

 displayList.Sort ((x, y) => x.value.CompareTo (y.value));
 displayList.Sort ((x, y) => x.name.CompareTo (y.name));

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