C# | SortedDictionary.Add() Method

This is used to add a specified key and value to the sorted dictionary. The elements are sorted according to TKey.

Syntax:

public void Add (TKey key, TValue value);

Parameters:

key: It is the key of the element to add.
value: It is the value of the element to add. The value can be null for reference types.

Exceptions:

  • ArgumentNullException : If the key is null.
  • ArgumentException : If an element with the same key already exists in the Dictionary.

Below are the programs to illustrate the use of Dictionary<TKey, TValue>.Add() Method:

Example 1:

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// C# code to add the specified key
// and value into the SortedDictionary
using System;
using System.Collections.Generic;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Create a new SortedDictionary
        // of strings, with string keys.
        SortedDictionary<string, string> myDict = 
           new SortedDictionary<string, string>();
  
        // Adding key/value pairs in myDict
        myDict.Add("Australia", "Canberra");
        myDict.Add("Belgium", "Brussels");
        myDict.Add("Netherlands", "Amsterdam");
        myDict.Add("China", "Beijing");
        myDict.Add("Russia", "Moscow");
        myDict.Add("India", "New Delhi");
  
        // To get count of key/value
        // pairs in myDict
        Console.WriteLine("Total key/value pairs in"
                 + " myDict are : " + myDict.Count);
  
        // Displaying the key/value
        // pairs in myDict
        Console.WriteLine("The key/value pairs"
                          + " in myDict are : ");
  
        foreach(KeyValuePair<string, string> kvp in myDict)
        {
            Console.WriteLine("Key = {0}, Value = {1}",
                              kvp.Key, kvp.Value);
        }
    }
}

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Output:

Total key/value pairs in myDict are : 6
The key/value pairs in myDict are : 
Key = Australia, Value = Canberra
Key = Belgium, Value = Brussels
Key = China, Value = Beijing
Key = India, Value = New Delhi
Key = Netherlands, Value = Amsterdam
Key = Russia, Value = Moscow

Example 2:

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// C# code to add the specified key
// and value into the SortedDictionary
using System;
using System.Collections.Generic;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
  
        // Create a new SortedDictionary
        // of strings, with string keys.
        SortedDictionary<string, string> myDict =
           new SortedDictionary<string, string>();
  
        // Adding key/value pairs in myDict
        myDict.Add("Australia", "Canberra");
        myDict.Add("Belgium", "Brussels");
        myDict.Add("Netherlands", "Amsterdam");
        myDict.Add("China", "Beijing");
        myDict.Add("Russia", "Moscow");
        myDict.Add("India", "New Delhi");
  
        // The Add method throws an
        // exception if the new key is
        // already in the dictionary.
        try {
  
            myDict.Add("Russia", "Moscow");
        }
  
        catch (ArgumentException) {
  
            Console.WriteLine("An element with Key "
                  + "= \"Russia\" already exists.");
        }
    }
}

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Output:

An element with Key = "Russia" already exists.

Note:

  • A key cannot be null, but a value can be. If the value type TValue is a reference type.
  • This method is an O(log n) operation, where n is Count of elements in the SortedDictionary.

Reference:



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