I have the following code in c# , basically it's a simple dictionary with some keys and their values.
Dictionary<string, int> dictionary = new Dictionary<string, int>(); dictionary.Add("cat", 2); dictionary.Add("dog", 1); dictionary.Add("llama", 0); dictionary.Add("iguana", -1); I want to update the key 'cat' with new value 5.
How could I do this?
Have you tried just
dictionary["cat"] = 5; :)
Update
dictionary["cat"] = 5+2; dictionary["cat"] = dictionary["cat"]+2; dictionary["cat"] += 2; Beware of non-existing keys :)
Try this simple function to add an dictionary item if it does not exist or update when it exists:
public void AddOrUpdateDictionaryEntry(string key, int value) { if (dict.ContainsKey(key)) { dict[key] = value; } else { dict.Add(key, value); } } This is the same as dict[key] = value.
dict[key] = value in one line. Also I would call the funcation AddOrUpdatedict[key] = value.. What do you think dict[key] = value does?
var x = dict[key] will throw when key does not exist. dict[key] = x will not throw when key does not existJust use the indexer and update directly:
dictionary["cat"] = 3 Dictionary is a key value pair. Catch Key by
dic["cat"] and assign its value like
dic["cat"] = 5 