Chapter 9.5, Problem 9.23CP

Explanation of Solution

Retrieving elements:

There are two different ways to retrieve an element with a particular key in a Dictionary as follows.

Using [ ] operator:

• The general format to retrieve a value from a Dictionary is as follows:

  dictionaryName[key]

• In the above format,
  • dictionaryName refers to the variable, which references the Dictionary.
  • key refers to the key.
• If a key exists already in the Dictionary, then the expression returns the value associated with the key.
• If a key does not exist in the Dictionary, then an exception will be thrown.

Using TryGetValue method:

• The general format to retrieve a value from a Dictionary using the TryGetValue method is as follows:

  dictionaryName...