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 parameter, so I leave it as is. This results in the following error: ‘The out parameter ‘value’ must be assigned to before control leaves the current method’

So, basically, I need a way to get the default value (0, false or nullptr depending on type). My code is similar to the following:

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

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;     }      ....  }