C# | Add the specified key and value into the ListDictionary
ListDictionary.Add(Object, Object) method is used to add an entry with the specified key and value into the ListDictionary.
public void Add (object key, object value);
key : The key of the entry to add.
value : The value of the entry to add. The value can be null.
- ArgumentNullException : If the key is null.
- ArgumentException : It is an entry with the same key already exists in the ListDictionary.
Below given are some examples to understand the implementation in a better way:
Total number of elements in myDict are : 6 Australia Canberra Belgium Brussels Netherlands Amsterdam China Beijing Russia Moscow India New Delhi
System.ArgumentNullException: Key cannot be null.
Parameter name: key
- An object that has no correlation between its state and its hash code value should typically not be used as the key. For example, String objects are better than StringBuilder objects for use as keys.
- This method is an O(n) operation, where n is Count.