Get an existing item from a dictionary or create a new value with a default value, using an extension method.

 static class extensionMethods

     public static V TryGetValueOrCreate<K, V>(this Dictionary<K, V> dictionary, K key) 
     where V : new()
       V data;
       if (!dictionary.TryGetValue(key, out data))
          data = new V();
          dictionary.Add(key, data);
       return (data);

The method above can be used using the code below:

public class Item
   public int test;

Dictionary<int,Item> dict = new Dictionary<int,Item>();
Item item = dict.TryGetValueOrCreate(3);
item.test= 123;

Lastest update in December 2019, inital post in December 2019

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