Returning a default value. (C#)

Question

I\'m creating my own dictionary and I am having trouble implementing the TryGetValue function. When the key isn\'t found, I don\'t have anything to assign to the out parame

Answer 1

You are looking for the default keyword.

For example, in the example you gave, you want something like:

class MyEmptyDictionary<K, V> : IDictionary<K, V>
{
    bool IDictionary<K, V>.TryGetValue (K key, out V value)
    {
        value = default(V);
        return false;
    }

    ....

}

Answer 2

default(T)

Answer 3

return default(int);

return default(bool);

return default(MyObject);

so in your case you would write:

class MyEmptyDictionary<K, V> : IDictionary<K, V>
{
    bool IDictionary<K, V>.TryGetValue (K key, out V value)
    {
        ... get your value ...
        if (notFound) {
          value = default(V);
          return false;
        }
    }

....

}