Determines if a dictionary contains a given KeyValuePair, and if so, removes it. This implementation checks to see if the dictionary contains the given key, and if the value associated with the key is equal to (via object.Equals) the value. If so, the key-value pair is removed.

Removes the key (and associated value) from the underlying dictionary of this view. that is equal to the passed in key. If no key in the view is equal to the passed key, the dictionary and view are unchanged.