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?
This question is related to
c#
c#-4.0
dictionary
key-value
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.
Just 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
Source: Stackoverflow.com