Chapter 9, Problem 8AW

Program Plan Intro

Dictionary:

• A dictionary is referred to as an object, which is used to store a collection of data.
• Dictionary consists of two parts, such as a key and a value.
• Dictionary is also known as key-value pairs.
• Each key consists of a specific value and can be used for locating that value.
• The general format to declare a Dictionary object is as follows:

  Dictionary<KeyType, ValueType> Dname = new Dictionary<KeyType, ValueType>();

• In the above format,
  • KeyType refers to the data type of each element’s key.
  • ValueType refers to the data type of each element’s value.
  • Dname refers to the Dictionary name.

KeyValuePair object:

• Generally, an element is stored in a Dictionary as an object of the KeyValuePair type.
• The KeyValuePair type consists of two properties such as a Key and a Value.
• The Key property is used to store the key of the element and the Value property is used to store the value of the element.
• In a Dictionary, the foreach loop is used to iterate over all the elements of KeyValuePair type.