C# | SortedDictionary.Add() Method

Last Updated : 21 Jan, 2019

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:

   // 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); 
        } 
    } 
} 
 
  

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:

   // 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."); 
        } 
    } 
} 
 
  

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:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.sorteddictionary-2.add?view=netframework-4.7.2

C# SortedDictionary Class

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C# | SortedDictionary.Add() Method

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